Zhejiang Dahua Vision Technology DH-PFM881 AP User Manual Rev1
Zhejiang Dahua Vision Technology Co., Ltd AP Rev1
User manual_Rev1
Dahua 5.8GHz Wireless AP/CPE User Manual
Dahua 5.8GHz Wireless AP/CPE
User Manual
Version： 1.0.0
Zhejiang Dahua Technology CO., LTD
Dahua 5.8GHz Wireless AP/CPE User Manual
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File Version Description
Sheet 1 Version Description
Version Release Time Revised Chapters Author
1.0 2014-05-12 Establish cl
Reference Materials
Manual Purposes
The manual mainly provides the users with some help to get familiar with DH-PFM88X and how to
use DH-PFM88X; especially they can solve some common problems when some troubles occur to the
device. The manual is mainly involved in DH-PFM88X hardware info, various parameters of webpage,
configuration mode, networking mode, malfunction analysis and some other aspects, which can
effectively help users to get familiar with the usage of the device quickly and shorten the time of entry
Bridge series products for users.
Statement
The right of final explanation of this file belongs to Zhejiang Dahua Technology CO., LTD; our
company is not liable for any damage of the device caused by unauthorized use.
Noun Definition and Acronym Description
Sheet 2 Noun Definition and Acronym Description
SN Definition or
Acronym Description
1 DH-PFM880 Long-distance wireless transmission server AP
2 DH-PFM881 CPE client
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Table of Contents
1Product Overview ......................................................................................................... - 1 -
1.1 Product Introduction ............................................................................................................................ - 1 -
1.2 Electrical Specifications ...................................................................................................................... - 4 -
1.3 Product Packaging List ........................................................................................................................ - 6 -
1.4 Product Features .................................................................................................................................. - 6 -
1.5 Application Range ............................................................................................................................... - 7 -
1.6 Hardware Description .......................................................................................................................... - 8 -
1.7 Hardware Description .......................................................................................................................... - 8 -
2Product Installation ................................................................................................... - 10 -
2.1Line Connection.................................................................................................................................. - 10 -
2.2Restore Default Factory Setting .......................................................................................................... - 11 -
3Quick Configuration .................................................................................................. - 12 -
3.1 Log In .............................................................................................................................................. - 12 -
3.2 Device Quick Configuration through Setting Wizard ...................................................................... - 13 -
4. TDMA ................................................................................................................................ - 18 -
5. Status Display ................................................................................................................ - 19 -
5.1 Status Display .................................................................................................................................... - 19 -
5.2 Real-Time Monitoring ....................................................................................................................... - 20 -
6. Wireless Setting ............................................................................................................ - 22 -
7. Network Setting ............................................................................................................. - 23 -
7.1 Route Mode ....................................................................................................................................... - 23 -
7.2 Bridge Mode ...................................................................................................................................... - 25 -
7.3 Firewall .............................................................................................................................................. - 25 -
8. Advanced Settings ....................................................................................................... - 27 -
9. System Settings ............................................................................................................ - 29 -
10. Tools Application ....................................................................................................... - 30 -
11. Common Networking Mode ..................................................................................... - 33 -
11.1 Wireless Point-to-Point .................................................................................................................... - 33 -
11.2 Wireless Point–to-Multipoint ........................................................................................................... - 34 -
11.3 Wireless Coverage Bilnd Angle Adjustment Mode ......................................................................... - 35 -
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11.4 Route Mode Networking .................................................................................................................. - 36 -
12. FAQ ................................................................................................................................ - 38 -
13. Construction attention for wireless bridge and monitoring. ...................... - 40 -
13.1 Construction attention ...................................................................................................................... - 40 -
13.2 Test Situation ................................................................................................................................... - 41 -
13.3 Reference Setting: ............................................................................................................................ - 42 -
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1 Product Overview
DH-PFM88X series device is a device with unique built-in TDMA wireless technology, which
integrates industry-leading core technology and has the features of long distance transmission, high
throughput rate and strong anti-interference.
TDMA，20M/40MHz bandwidth flexible configuration, rate control, ACK overtime auto adjustment
and etc. TDMA effectively solved the problem of hidden node which bothers large-scale
point-to-multipoint WLAN. 20M/40MHz bandwidth flexible configuration achieved a balance between
scarce wireless bandwidth resource and complex working scenario. Advanced rate control algorithm can
quickly adapt to channel quality change and at the same time keep the rate stable as much as possible.
Auto ACK-Timeout Adjust technology can auto detect the distance between access point and client;
adjust wireless parameter to optimize the device performance.
DH-PFM880 max transmission distance can reach 5km, max transmission rate can reach 300Mbps,
and it also has excellent long-distance transmission performance, It can be used as wireless bridge
between point-to-point and point-to-multipoint remote access, and a base station AP for WI-FI wireless
coverage.
1.1 Product Introduction
PFM has the most advanced design technology in the industry; compact body contains base station
and wireless transmission effect and an advantage of high performance.
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses, and can
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radiate radio frequency energy, and if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be determined by
turning the equipment OFF and ON, the user is encouraged to try to correct the interference by one or
more of the following measures:
Reorient or relocate the receiving antenna
Increase the separation between the equipment and receiver
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected
Consult the dealer or an experienced radio/TV technician for help.
The manufacturer is not responsible for any radio or TV interference caused by unauthorized
modifications to this equipment. Such modifications could void the user’s authority to operate the
equipment.
To satisfy FCC RF exposure requirements for mobile and base station transmission devices, a
separation distance of 20 cm or more should be maintained between the antenna of this device and
persons during operation. To ensure compliance, operation at closer than this distance is not
recommended. The antenna(s) used for this transmitter must not be co-located or operating in
conjunction with any other antenna or transmitter.
Integrated advanced TDMA, MIMO and other advanced technologies. Innovative compatibility and
improvement of 802.11n protocol guaranteed long distance, throughput rate and anti-interference ability
of device wireless transmission. DH-PFM88X series wireless device owns following advantages
compared with other brand products:
1. Integrated Technology
DH-PFM88X with built-in operating system integrated TDMA, which effectively solved the problem
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of hidden node which bothers large-scale point-to-multipoint WLAN. Operating system adopts
advanced rate control algorithm which can quickly adapt to channel quality change and at the same
time keep the rate stable as much as possible. It is suitable for long-distance wireless transmission
and solved the problem of long-distance point-to-point access, which makes more access number
and rate distribution more average, which is fit for the application of operator and wireless
monitoring field.
2. Long Transmission Distance, High Throughput Rate
DH-PFM88X max transmission distance can reach 5km, max transmission rate can reach 300Mbps,
and it also has excellent long-distance transmission performance, Its long-distance transmission
and high performance can meet the users’ demand of high bandwidth and long-distance
communication.
3. Integrated Watchdog
DH-PFM88X integrated hardware watchdog which monitors system operation all the time. Once the
system works abnormally, watchdog will reset the system and make it restart, which effectively
guarantees the stability of DH-PFM88X.
4. Ping Watchdog Function Real-time Detect Link
Ping Watchdog function can detect if the link works normally, it will help to restart the device when
malfunction occurs to the link, which guarantees stability of the link.
5. A great number of frequencies provided to users
Currently most wireless products are working in standard 802.115.8G frequency, but the standard
5.8G frequency band is relatively less. 5.8G device will be more susceptible to interference when
the use of 5.8G device is very extensive. However, DH-PFM88X products increased support for
5.8G nearby frequency, which will make the working frequency expand to 4920MHz-6100MHz.
Because the interference of some frequencies is very little, the client working in these frequencies
and performance of access point are better than other frequencies. DH-PFM88X’s support for
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non-standard frequency reduced the interference from outside wireless products and effectively
improved the throughput rate of DH-PFM88X, which will meet users’ demand for high bandwidth.
Attention: Please confirm if it conforms to local laws and regulations and radio management
regulations before using these non-standard frequency bands.
6. Adapt to complex working environment
DH-PFM88X can work in complex environment, working temperature is between -30℃ and 70℃,
working humidity is between 5％ and 95％. DH-PFM88X can still maintain high throughput rate if it
works in thunderstorm, high temperature high humidity, low temperature low humidity and other
severe weather conditions for a long time.
1.2 Electrical Specifications
See sheet 3 for the electrical specifications of DH-PFM88X.
Type Item DH-PFM880 DH-PFM881
Wireless
Technology
Standard IEEE802.11 a/n
Modulation Mode 802.11 a/n: OFDM
Antenna External antenna：gain 16dBi Built-in antenna：gain 15dBi
Equivalent Output
Power +9dBm(@MCS0,11n) ＋9dBm(@MCS0,11n)
Receiving Sensitivity -74dBm @ 65Mbps, -96dBm@1Mpbs
Optimal
Transmission
Distance
0-3KM 0-5KM
Working Frequency
Band 5.725GHz~5.85GHz
Wireless
Authentication SRRC
Wireless Direction
Angle Horizontal 90°，vertical 12° Horizontal 40°，vertical 15°
Transmission Rate
11n:13.5/15/27/30/40.5/45/54/60/81/90/108/120/121.5/135/150/162/
180/216/240/270/300Mbps (40MHz Channel width)
11n ：130/117/104/78/65/58.5/52/39/26/19.5/13/6.5Mbps (20MHz
Channel width)
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11a ：54/48/36/24/18/12/9/6Mbps(self-adaption)
Hardware
Power Module Port 1*POE RJ45(IN: 220V, OUT: 24V/0.5A)、1*LAN RJ45
Power Consumption MAX 10W MAX 8W
Port 1*POE RJ45 1*POE RJ45、1*LAN RJ45
Indicator Light N/A
Wi-Fi status indicator light / LAN
port indicator light / Power
indicator light / Signal intensity
indicator light
Working
Temperature -30℃～+70℃
Storage
Temperature -30℃～+80℃
Working Humidity 5%～95%RH( no condensation)
Equipment
Dimension(mm) 233×233×45mm 280×30×80mm
Antenna
Dimension(mm) 450×140×35 mm N/A
Equipment Weight 2.4Kg 0.45Kg
Antenna Weight 1.26Kg N/A
Protection Level IP66 N/A
Mast Diameter 40mm~60mm
Software
Encryption Way WEP/WPA-PSK/WPA2/CCMP(AES)/TKIP
Network Mode Route/Network Bridge
Working Mode Access Point/Client/WDS AP/WDS client/WDS Repeater
Security Mechanism IP/MAC address filtering, hide network name and etc
Network Protocol TCP/UDP/ARP/ICMP/DHCP/HTTP/NTP
TDMA
Enhancement
Support (TDMA eliminate hidden nodes influence and greatly
improve one-to-many performance）
Auto ACK-Timeout
Adjust
Support (Auto optimize parameter within long-distance
communication and make the performance optimal）
Management and
Log
NTP, SNMP, Syslog, Telnet
Webpage
Configuration
Management
Support webpage configuration
Firmware Update Support Firmware webpage update
Channel Width 20M/40MHz
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Sheet 3
1.3 Product Packaging List
DH-PFM880
y Host *1；
y Antenna *1
y Feeder line *2
y POE power supplier (24V/0.5A)*1；
y Quick configuration manual；
y Compact disc；
y Accessory
DH-PFM881
y Host *1；
y POE power supplier (24V/0.5A)*1；
y Quick configuration manual；
y Compact disc；
y Ribbon *2；
1.4 Product Features
z Adopt high performance 802.11n 2X2 MIMO chip，max rate 300Mbps，outdoor max transmission
distance 5km
z Support five working modes: AP, Station, AP-WDS, Station-WDS, Repeater-WDS
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z Use unique TDMA technology, intelligent rate control, auto ACK overtime adjustment and some
other technologies.
z TDMA protocol overcame 802.11 inherent problem of inherent node, which makes the product have
better long-distance and point-to-point performance.
z Support point-to-point and point-to-multipoint transmission modes.
z Exclusive antenna, radio-frequency amplifier, low noise receiver design, ensure long-distance video,
audio and data transmission.
z Customize common scenario and working mode for users, make it convenient for non-wireless
professionals to use and install.
z Exclusive TDMA technology can maximize the use of bandwidth resource and better support
point-to-multipoint data transmission.
z POE power supply，support international universal 802.3af standard，power supply mode is more
convenient and reliable.
z Remote control and management through webpage, easy for configuration.
z Water-proof and ultraviolet-proof cover ensures outdoor stable operation for the device.
1.5 Application Range
1. Safe towns, safe construction sites, safe scenic area
2. Playground, ranch, uptown crossroad and other no blocking scenarios.
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1.6 Hardware Description
See sheet 4 for the simple hardware information of DH-PFM88X:
Hardware Index
CPU/Baseband Radio Atheros AR7240/AR9280
Memory 32MB DRAM, 8MB Flash
Physical Port 2×10/100M Base-TX (Cat. 5/5E, RJ-45)Internet
access(DH-PFM881)
1×10/100M Base-TX (Cat. 5/5E, RJ-45)Internet
access(DH-PFM880)
LED Indicator Light Power, LAN, WLAN, 3×Link Quality(DH-PFM881)
Power Supply POE, Power Adapter 24V/0.5A
Sheet 4
1.7 Hardware Description
In order to make users not have to login webpage, and let them have a rough idea of current
working situation of DH-PFM881 intuitively with naked eyes, DH-PFM881 adopts LED to show
current working condition and connection quality. LED is mainly divided into two parts, one is device
status, and the other is connection quality. See Figure 1 for more details, the first LED from left is
power indicator, the second is network indicator, the third is connection indicator; the first to the third
from right are signal intensity indicator, see sheet 5 for more details.
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Figure 1
LED Color Status
POWER Green Light on means DH-PFM881 connected
power
LAN Green Light on means DH-PFM881 LAN port is
connected to external device
WLAN Green Light on means wireless of DH-PFM881 is
enabled.
Flashing light means the device wireless is
enabled and transmitting data by wireless.
Signal Intensity
Red Indicator shows the signal intensity
Green light on means high signal intensity
Yellow light on means medium signal
intensity
Red light on means weak signal or no
signal
Yellow
Green
Sheet 5
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2 Product Installation
The line connection mode is different under different network mode, because the device default
setting is bridge mode. This chapter mainly describes the line connection mode of bridge mode, please
refer to chapter 7 network setting for the connection mode of route mode.
2.1 Line Connection
See Figure 2 for the installation of DH-PFM881.
Figure 2
DH-PFM881 device has two internet accesses (RJ45 ports), which are marked as “POE” and
“LAN2” respectively. The device default setting is bridge mode, so “POE” port is connected to POE
power port by network cable and provides DH-PFM881 device with 24V power and data connection.
“LAN2” port can be linked to IP Camera (such as video surveillance application) and other devices.
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2.2 Restore Default Factory Setting
We can choose manual operation when users forget the IP of DH-PFM881 and can’t open the
webpage. See Figure 3 for more details; press Reset button for 5-10 seconds, let go when all the
LED lights are on, and the device has been restored default factory setting. Meanwhile, the port with
direct connection with DH-PFM881 host will show twice connection and disconnection in a row.
Figure 3
See sheet 6 for main parameters of DH-PFM881 default factory setting
Item Default Factory Setting
IP Address 192.168.1.36
User Name admin
Password admin
Way of Encryption WPA->WPA2->CCMP->PSK Key：1234567890abc
Network Mode Bridge Mode
Sheet 6
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3 Quick Configuration
This chapter mainly describes how to make quick configuration to Bridge device and make it work
normally.
3.1 Log In
Login DH-PFM88X configuration work is made up of setting the host which connects DH-PFM88X
directly and log in, operation steps are as follows:
1. Network connection->local connection, select local connection and single click right button, click
properties by mouse left button.
2. Select Internet protocol (TCP/IP), double click with mouse left button, you will see the window
shown in Figure 4.
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Figure 4
3. IP address is set the same network segment IP of DH-PFM88X, which is shown in Figure 4, and
the IP can’t be the same as DH-PFM88X. For example: the IP of DH-PFM88X is 192.168.1.36, then
the host IP can be set as 192.168.1.180; meanwhile, different DH-PFM88X devices need to be
allocated with different addresses so as not to cause address conflict.
4. Input DH-PFM88X IP in the browser and press enter key, enter the login interface, default user
name and password are admin\admin；
3.2 Device Quick Configuration through Setting Wizard
Users can make quick configuration to Bridge device by setting wizard in this chapter.
1. The first page is “Status Display” After login (see Figure 5); it shows the current working status,
current setting and software version of DH-PFM88X. Other pages can be displayed by clicking the
menu o n the left, as shown in Figure 6.
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Figure 5
2. Click “Setting Wizard” on the left, as shown in Figure 6. The wizard can help users to make quick
configuration to the device, such as network configuration, wireless mode and etc.
Figure 6
3. Click “Next”, it will display basic network parameter configuration. Device default configuration is
“Bridge Mode”, LAN port IP address is “192.168.1.36”，as shown in Figure 7. If users need to
configure the device as “Bridge Mode” and other detailed network setting, please click the “Network
Setting” menu on the left after completing setting wizard.
Attention: If several DH-PFM88X devices realize interconnection of point-to-point or
point-to-multipoint, different devices need to be configured with different IP address.
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Figure 7
4. Click “Next” and it will display basic wireless mode and wireless security options, as shown in
Figure 8. Two of most commonly used wireless mode of DH-PFM88X device are “client” and
“access point”.
Configured as “client” (Station) mode: It means DH-PFM88X device can be connected to
DH-PFM88X device of “access point” mode.
Configured as “Access Point” (AP) mode: It means DH-PFM88X device can be connected to
DH-PFM88X device of “client” mode.
The precondition is that configuration between wireless encryption option of wireless connection for
both sides and network name should be in accordance with each other. Please click “wireless
Setting” menu on the left if you need other detailed wireless configuration.
Attention: If you need one-to-one (one-to-many) device interconnection and transmit audio or data,
the center device needs to be configured as “Access Point” while other devices configured as
“client”, and configured with same way of encryption, then let “Access Point” device connect to
“Client” device, in this way audio or data transmission can be done.
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Figure 8
5. Click “Next” and it will display working scenario option, as shown in Figure 9. Please enable
“custom scenario” if the users need to customize working scenario, then click “Next” to display
custom scenario configuration. If users enable other options and click “Next”, the completion page
of setting wizard will occur.
Figure 9
6. In the page “setting wizard-custom scenario”, as shown in Figure 10. The following several option
setting will affect the device performance:
Output Power: Users need to configure the device output power according to the actual working
situation and local laws and regulations, the bigger output power is, and the longer wireless transmission
distance will be (The system supports max output power 9 dBm).
Channel Width: default is 20MHz, to reach optimal wireless transmission rate. It is recommended to use
channel width 10MHz under the environment of serious block and long-distance communication (>1km)
to improve the quality of wireless transmission.
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Auto ACK-Timeout Adjust: Users are recommended to open “Auto ACK-Timeout Adjust”, this option
can auto test the distance between two devices and set parameters according to this distance to
optimize wireless connection quality.
Distance: If “Auto ACK-Timeout Adjust” option is open, then the distance setting will become invalid,
system will auto test device distance and optimize connection quality. Users need to close “Auto
ACK-Timeout Adjust” option if they want to make the distance which is set by themselves take effect.
Figure 10
7. The last page is “Setting Wizard-Finish”, as shown in Figure 11. Users can click “change” button
to save all the settings, then click “Apply” button to make your settings valid; or click “apply” to
modify previous configuration.
Figure 11
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4. TDMA
Currently, most long-distance wireless broadband network bridge products developed from 802.11
WLAN technologies. The built-in operation system integrated TDMA，20M/40MHz bandwidth flexible
configuration, rate control, Auto ACK-Timeout Adjust and several other industry-leading technology,
which is an ideal product of long-distance wireless broadband access. Among those, TDMA effectively
solved the problem of hidden node which bothers large-scale point-to-multipoint WLAN. 20M/40MHz
bandwidth flexible configuration achieved a balance between scarce wireless bandwidth resource and
complex working scenario: narrower wireless bandwidth configuration is used in the situation where
there are less free wireless channels and a single user wireless access rate requirement is not high;
wider wireless bandwidth configuration is used under the situation where there are more free wireless
channels and single user wireless access rate requirement is high. Besides the narrower wireless
bandwidth configuration is more effective in the environment with block. Operation system adopts
advanced rate control algorithm which can quickly adapt to channel quality change and at the same time
keep the rate stable as much as possible, which is very suitable for long-distance wireless transmission.
Auto ACK-Timeout Adjust technology can auto detect the distance between access point and client;
adjust wireless parameter to optimize the device performance. See Figure 12 for client TDMA.
Figure 12
When you enable TDMA function, AP end needs to enable TDMA, client needs to set a priority. Different
clients ask for different demand for bandwidth when one AP links to several clients, but the setting of
priority is done according to clients’ demand of bandwidth for current device. We recommend users to
set priority as high if the demand for bandwidth id high, otherwise, priority should be set as low priority.
Anyway, all the clients’ priority can be set same if they have the same demand for bandwidth.
Attention: The TDMA of AP and client should both be open when you want to enable TDMA function.
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The TDMA from other factories can’t communicate with our TDMA. If both our device and device from
other factories enable TDMA, then both sides can’t be connected.
5. Status Display
Status Display is the first page after the users log in, the page displays current configuration of the
current device and current working condition of real time monitoring. It is located in the second item of
the menu bar; see Figure 13 for more information.
Figure 13
5.1 Status Display
It shows current configuration information on the status display page, which shown in sheet 7
Item Function Item Function
Device Name DH-PFM88X Kernel Version 2.6.31
Firmware Version Software Version 802.11 Mode The current 802.11 protocol
WAN IP WAN port IP address
with route mode
WAN
MAC
WAN port MAC address with
route mode
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Network Mode Operation mode, route
mode or bridge mode
SSID Name of wireless network
Frequency/Channel Communication channel Channel width Four types: 5M、10M、20M、
20/40M AUTO
Wireless Mode Client, access point,
WDS client, WDS access
point, WDS repeater
Security
Mode
Several ways of encryption for
wireless
Distance The distance between
client and access point
which are interconnected
Noise
Floor
Interference from external
environment
Signal Level Parameter for Client,
WDS client, WDS
repeater, which indicates
the total signal intensity
of client and the signal
intensity of up and down
two way for client
Link
Quality
The quality of link connection
TX/RX Rate Parameter for client,
WDS client, WDS
repeater, which indicates
the momentary rate of
sending/receiving data
for current device
Time Time display. Time will auto
update to calibration time from
NTP service when NTP client is
enabled and NTP service is set
right. There will be a default if
you can’t log on the Internet.
Sheet 7
5.2 Real-Time Monitoring
Throughput Rate: Throughput rate is also called throughput capacity, which means the data volume
passing through each section in unit time while the throughput rate on status display page means the
data volume transmitting through network in unit time, which is the main index to measure network
performance. Users can also real time monitor the rate of device transmitting data volume by it. See
figure 14 for more information.
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Figure 14
Routes Table: The routing list stores the paths which point to the network for DH-PFM88X device. See
Figure 15 for more information.
Figure 15
Bridging Table: PFM 88X acquired the corresponding relation between device MAC address which
communicate though it recently and aging time.
ARP Table: The device acquired the corresponding relation between used IP address which
communicate through LAN port recently and MAC address.
Access Point/Client information sheet: When the device is used as AP mode and it connected a client,
then you can see the client information shown in Figure 16.
Figure 16
When the device is used as client mode, and it connected an AP, then it will display AP information
shown in Figure 17.
Figure 17
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6. Wireless Setting
More information about wireless setting.
There are five types of wireless mode of the device: AP mode, client mode, WDS client mode, WDS
Repeater
AP : Client device like computer, cell phone, wireless bridge and etc can connect to wireless access
node. One AP can connect several clients.
CPE/Client: It needs to be used cooperatively with AP, it connects to AP. One client can only connect to
one AP.
WDS Client: Same as client can only connect to WDS access point or WDS repeater, and one WDS
client can only be connected to one WDS access point or WDS repeater.
WDS Access Point: Can only connected to WDS repeater or WDS client, meanwhile one WDS access
point can connect to several WDS client or WDS repeater.
WDS Repeater: Can connect to WDS client or WDS repeater at the same time.
SSID: Used to control the value of access to wireless network. When other devices try to connect to this
device, only with same setting of SSID can they realize intercommunication and build LAN.
As shown in Figure 20, users can search the names of surrounding wireless network by click “select” on
the right of network name, and then connect to corresponding wireless network according to his own
demand.
Frequency: Center frequency of carries wave, bandwidth is the left-right offset of the center frequency. It
needs to be set parameter when it is used as AP mode. Users can select several frequencies when it is
client mode. Client can’t connect to AP when the frequency of AP is not the frequency selected by client.
Only when the frequency of AP is one of the frequencies selected by client can they be interconnected.
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Output Power: Users can adjust the output power of device transmitting wireless signal according to the
distance between devices. The transmitted signal distance and intensity will improve when output power
goes up.
Channel Width: It means max data transmission rate of the channel.
Max TX Rate: Limit the device max send/receive rate by setting it and keep the stability of device
performance by dong so.
Root Access Point MAC Address: Client, WDS Repeater or WDS client can limit the object that the
device is to connect by setting it.
Wireless Security Setting: Make encryption to wireless connection, users can select corresponding
encryption way according to their own demand for safety. The devices which are to be interconnected
need to be set the same wireless encryption, otherwise, they won’t be interconnected.
WEP: Wired equivalent encryption technology, a data encryption technology.
WPA: A kind of specification based on standard to enhance the interoperable safety, which has greatly
increased the control level of data protection and access in the existing and future WLAN system. It is
designed into the form of software upgrading and run on the existing hardware, Wi-Fi Protected Access
is from and will be compatible with the future IEEE 802.11i standard. After it is installed correctly, it will
provide users of wireless network with high-level protection, which will always make their data protected
and it is only open to those authorized network users. WPA made up all the defects of WEP.
7. Network Setting
7.1 Route Mode
DH-PFM88X is used as a router when it is under route mode; it has WAN port and LAN port. At this
moment, the LAN2 of DH-PFM88X is equivalent to the LAN port of router while the LAN port on POE
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power supplier is equivalent to the WAN port of router. See Figure 19 for its line connection when it is
under route mode.
Figure 19
See Figure 20 for more information about router mode.
Figure 20
WAN Mode: Wan mode is about WAN port being set static IP address and DHCP. Users need to
manually set IP, subnet mask and etc when it is set as static IP. The device will auto get IP address
from DHCP server when it is set as DHCP.
WAN IP: IP address of WAN port, can be set the same IP address of the same segment which is to
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connect to network.
WAN Subnet Mask: Subnet Mask of WAN port can be set the same address of the same segment
which is to connect network.
Attention: IP address of WAN port can’t be set the same as the existing IP on the network in order
to avoid IP address conflict.
LAN IP: IP address of LAN port, users can set it according to his own demand. Make sure the IP
address is not the same as other device IP address in the same network, so as not to cause IP
address conflict.
LAN Subnet Mask: Subnet mask of LAN port, users can set the IP of LAN port according to his own
demand.
Primary DNS and Second DNS: DNS server set the value of local DNS server.
Gateway: Generally it is ok to set gateway address as IP address of LAN port.
7.2 Bridge Mode
There is no WAN port for bridge mode. Both the LAN port on POE power supplier and the LAN2 port on
DH-PFM88X are LAN ports, users can select one network port to connect according to his own demand.
Refer to Figure 3 for more details. The setting of IP address of LAN port and subnet mask is same as
route mode.
7.3 Firewall
When users want to use DH-PFM88X to shield some devices, they can use firewall to realize this
function, see Figure 21 for more details; there are four situations of firewall filtering:
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Figure 21
1. Filter a device with IP address xxx.xxx.xxx.xxx
After firewall is enabled, IP filtering mode is set as reject, and set any item among IP1～IP10 as the
IP to be filtered.
2. Filter some device
After firewall is enabled, select MAC filtering mode as reject, set any item among Mac1～Mac10 as
the MAC address of the device to be filtered.
3. Filter all other devices except the device with IP xxx.xxx.xxx.xxx
Select IP filter as accept, and set any item among IP1～IP10 as the IP to be accepted.
4. Only accept some device
After firewall is enabled, select MAC filtering mode as accept, set any item among Mac1～Mac10 as
the MAC address of the device to be accepted.
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8. Advanced Settings
See Figure 22 for more information about advanced settings page.
Figure 22
Auto ACK-Timeout Adjust: Users are recommended to open “ACK-Timeout auto adjustment”, which
can auto test the distance between two devices; can set parameter according to this distance to optimize
wireless connection quality.
Distance: The distance setting will be invalid if the “ACK-Timeout auto adjustment” is open. The system
will auto test the device distance and optimize connection quality. Users need to close “ACK-Timeout
Auto Adjustment” if they want to make the self-set distance valid.
Aggregation: Make different frames combine together and send out, enable this function to improve
throughput rate and the device is enabled by default.
RTS Threshold: RTS/CTS mechanism will enable if the packet length is equal to or more than the set
value. At this moment, the station will send a RTS to access point to inform it that data will be sent when
the station tries to send data. After receiving the application, the access point will inform all the other
stations in its covered area by CTS, asking them to delay sending. Meanwhile, the access point will
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inform the station which sent request to send data.
Threshold Threshold: If the packet length surpasses the set value, it has to be divided into several data
segment to send, and the number can only be even.
Multicast Data: When this function is enabled, DH-PFM88X will allow the multicast packet to pass it.
Antenna Switch: Set the value as external antenna when the device is using external antenna.
Otherwise, it is built-in antenna.
Client Isolation: To enable this function can make the devices which connect to the same access point,
WDS AP and WDS Repeater not be intercommunicated. It won’t cause any influence to communication
even if the client IP is repeated.
Max Client Limit: Limit the quantity of client which connect to access point, WDS AP and WDS
Repeater and WDS client by setting it.
Enable Auto-Negotiation: When it is enabled, the LAN port will auto adjust its speed to max public level
according to the connection speed and duplex mode of the device on the other end.
Enable Full Duplex: If the LAN port of DH-PFM88X allows the data transmission in two directions at the
same time.
LAN Port Speed: For the LAN port speed of DH-PFM88X, there are only two kinds which are 10Mbps
and 100Mbps.
Signal Intensity LED Setting: The setting of LED1, LED2 and LED3 here is the signal intensity value
which is needed to light three LED lights. The signal intensity value of LED3 is the biggest
(LED3>LED2>LED1), default settings are LED1:-86dB, LED2:-71dB and LED3:-56dB respectively. The
LED1 will be on if the signal intensity is higher than LED1 but lower than LED2; both the LED1 and LED2
will be on when signal intensity is higher than LED2 but lower than LED3; All of the LED1, LED2 and
LED3 will be on when the signal intensity is higher than LED3.
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9. System Settings
There are four parts on the system setting interface which are configuration management, firmware
configuration, device configuration and account information, see Figure 23 and 24 for more details.
Figure 23
Figure 24
Back-up Configuration File: Click to download; backup the configuration on the current webpage,
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pay attention that you can’t modify the configuration file content manually.
Uploading Configuration File: Click to browse, select the previously-downloaded configuration file,
click to upload, then you can restore the device configuration to it is when backuping configuration
file.
Firmware Upgrade: Click to browse, select the version which is to be upgraded; click to upgrade,
then the upgrade of device is on the way.
Firmware Reboot: Click reboott and the device begins to restart.
Restore Factory Settings: Click the factory setting on the webpage, then the device configuration
will restore to factory settings after a period of time.
Device Name: User can set the device name according to his own demand.
Login Timeout: When the user login timeout is set to a value and there is no response after the
webpage surpasses the time, it will auto jump to the login interface.
Interface Language: Users can set the language of the webpage according to his own demand.
Account Information: When user enables “modify user password”, he can modify the account
information according to his own demand.
10. Tools Application
There are two parts on the page of tools application which are testing tool and Telnet/DHCPD, as shown
in Figure 25.
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Figure 25
Ping IP: When user set a device IP in the ping IP bar, click ping, then ping’s result is Alive if the
device is connected to DH-PFM88X. Otherwise, it will be Not Alive.
Speed Test: When the access point is connected to client, set the IP address of access point (client)
in the network speed detection of client (access point), then click speed detection, the result will
display on the webpage after a while.
Ping Watchdog: It is used to continuously monitor the running condition of Wireless Bridge,
especially use Ping tool when connecting to remote host. Wireless Bridge can ping target host for a
long time, so if Wireless Bridge didn’t receive the defined a certain number of replies, it means the
tool will make the Wireless Bridge restart.
Ping IP Address: IP address of target host. Ping interval: time interval between two Pings.
Ping Failure: The device will restart WIFI when the times of continuous Ping failure reach the set
value.
Start Delay: After the Wireless Bridge system started, the time set by delay will start to Ping target
host.
WIFI Restart: The device will restart the system when the times of continuously restarting WIFI
reaches the set value.
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Telnet: When telnet is enabled, the command prompt window under Windows XP or Windows 7
adopts Telnet xxx.xxx.xxx.xxx (DH-PFM88X’s IP) which can log in DH-PFM88X. It is unable to log in
the device if Telnet is forbidden.
DHCPD: DH-PFM88X can be used a DHCP server when enabling DHCPD function, the DHCP
client which is connected to it can obtain relevant address from it.
Start IP and End IP: The IP address obtained by address pool and DHCP client can be only set
between start IP and end IP, which are usually set the same segment with DH-PFM88X.
Subnet Mask: Set subnet mask according to the IP of set address pool.
Router: It is the gateway address; user can set corresponding parameter according to what function
he wants to realize.
WINS: Generally it is ok for user to set the same as route if there is no special requirement.
DNS1,DNS2,DNS3：User can set according to his demand; generally it is ok to set the address of
local DNS server.
Syslog: Enable Syslog function, and at the same time set the IP of the PC where Syslog server is
located, server port is set as 514, then you can see the relevant log information on the Syslog
server.
NTP Client: PFM 88X can log on the Internet when NTP client function is enabled, and set the
network address where NTP server is located, DH-PFM88X will auto calibrate the set time from NTP
server and display it on the status display page.
SNMP Agency: SNMP agency allows network administrator to monitor network performance,
search and solve network problems. Such as SNMP agency option enabled, fill in the name of a
user in SNMP community, such as dahua, then fill in user’s corresponding mailbox:
leo@dahuatech.com , fill in creatcomm for location information, then save and apply. Install mrtg on
the host, open mrtg webpage, then information like the flow which passes DH-PFM88X can be
pbserved.
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11. Common Networking Mode
11.1 Wireless Point-to-Point
We generally set one DH-DH-PFM881 as access point, and the other as client during point-to-point
communication, see Figure 26 for more information.
Figure 26
1. Two DH-PFM88X network setting page -> network mode are both set as bridge mode; firewall is
forbidden for both DH-PFM88X and set different LAN IP;
2. Wireless page -> set wilreless mode as access point and client respectively, both AP and client are
set as the same SSID, set the same way of encryption and password for wireless encryption, like
WPA->WPA2->CCMP->1234567890, output power is set as 9 dBm, AP frequency can be set as
5.785GHz, channel width of AP and client can be set as 20MHZ；
3. Attention: Relative direction needs to be adjusted for access point and client.
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4. Use one computer to ping another one, which means inputting ping xxx.xxx.xxx.xxx (IP of another
computer) in one computer;
Expected Result: After the connection between access point and client, the computer which
connected access point and client can be interpinged, meanwhile, you can see the number of
connections is one on the page of status display for access point.
11.2 Wireless Point–to-Multipoint
Generally we set DH-DH-PFM880 as access point (single AP covers 90°, combination of four
pieces cover 360°), and other DH-DH-PFM881 are set client when it is during point-to-multipoint
communication, see Figure 27 for more details.
Figure 27
1. Network setting page of all the DH-PFM88X-> network mode are all set as bridge mode, and firewall
is forbidden for all (default is closed), set different LAN IP:
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2. Wireless page -> set wilreless mode as access point and client respectively, both AP and client are
set as the same SSID, set the same way of encryption and password for wireless encryption, like
WPA->WPA2->CCMP->1234567890, it is recommended to finish configuration according to device
wizard;
3. Attention: Relative direction needs to be adjusted for access point and client.
4. Use one computer to ping another one, which means inputting ping xxx.xxx.xxx.xxx (IP of another
computer) in one computer;
Expected Result: After the connection between access point and client, the computer which
connected access point and client can be interpinged, meanwhile, you can see the number of
connections is N on the page of status display for access point. (N means the number of connected
client)
11.3 Wireless Coverage Blind Angle Adjustment Mode
When the monitoring point is blocked seriously, we generally adopt two CPE back-to-back
connection to adjust angle during the direct communication between client wireless and central AP,
see Figure 28 for more information.
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Figure 28
1. Wired connection for two bck-to-back devices
2. Downlinked client device is set as access point, uplinked central AP device is set as client
3. Refer to 11.1 and 11.2 for detailed configuration
4. Expected Result: After the connection between access point and client, the computer which
connected access point and client can be interpinged, meanwhile, you can see the number of
connections is N on the page of status display for access point. (N means the number of connected
client)
11.4 Route Mode Networking
When TurboBridg5A is working under route mode, it is used as a router, see Figure 29 for more
information, the POE port of POE power supplier connects DH-PFM88X, the LAN port of POE
power supplier connects external network, the LAN port of DH-PFM88X connects computer, the
exact configuration is shown as follows:
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Figure 29
1. Network setting page -> network mode are both set as route mode, firewall is forbidden. Users can
set WAN mode as DHCP or static IP according to the fact whether there is DHCP server on the main
network, meanwhile, LAN IP users can modify the IP according to their demand, but they are
recommended not to modify IP too often, just in case the IP is forgotten and it will bring a lot of
trouble to your own life. When there is no DHCP in the external network to which DH-PFM88X is
connected, then the users need to set relevant parameters manually. At this moment, WAN IP is set
differently with the IP of other hosts from external network to which DH-PFM88X is connected, other
parameters can be set the same as the host which connects to the main network. For example: WAN
subnet mask, main DNS, auxiliary DNS, gateway can be set the same as other hosts which connect
to external network, the way of setting LAN IP and LAN subnet mask should be the same as the way
of setting DHCP.
Attention: LAN IP can’t be set as the same segment with WAN IP
2. Wireless setting page->set wireless mode as access point, network name can be any name, users
can set output power according to the distance between the devices, it is recommended to set the
max if it is in outdoor environment. Users can set the frequency of AP according to the surrounding
wireless environment setting, generally it can be set 5785MHz, wireless encryption is set not to be
encrypted;
3. Enable DHCPD on the tool application page, please refer to the setting method of DHCPD in chapter
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10 to set the parameters of DHCPD.
4. The network name of wireless connection is the WiFi network you set in advance, after the
computer is connected to DH-PFM88X, the WAN port address of ping DH-PFM88X, for example, the
WAN port IP of ping DH-PFM88X is 192.168.2.50, then you just input ping 192.168.2.50；
Expected result: The computer which is connected to the LAN port of TurboBridg2 can ping through
the WAN port IP of DH-PFM88X.
Expected result: the computer which is connected to LAN port of TurboBridg2 can ping through
WAN port IP of DH-PFM88X.
12. FAQ
1. The device can’t boot up normally:
(1). The network cable between CPE device and POE module is over 40m.
(2). The quality of network cable didn’t meet the standard of UTP-5 categories.
(3) The crystal head of network cable is insecure or cable sequence error (remake the crystal head)
2. Forgot IP address and unable to restore factory default
Please press Reset button for 5-10 seconds, try to input 192.168.1.36 IP to log in the device after all the
LED lights are on.
3. Why can’t fine wireless access point in my computer?
Solution: wireless system is connected with max working rate, the exact rate depends on distance and
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environment. Users can detect the following steps to make sure the max possible connection rate is
obtained.
(1) The location of wireless access point
Try to adjust the location and direction of wireless access point.
(2) Wireless channel
The interference could be obviously improved if you use other communication channel;
(3) Wireless interference
Other devices may also cause interference, so try to shut off other devices and check if the situation is
improved. Users also can shield the devices which cause interference or adjust the position.
4. The signal intensity is too low.
(1) It is not visible between CPE and AP due to bigger blocks.
(2) The surface plate of CPE doesn’t face AP directly; the vertical angle between AP and CPE is not
suitable.
(3) CPE is installed on the window, which may cause interference.
(4) The distance between AP and CPE is too far.
5. Why is the signal intensity high but the throughput capacity low?
Reasons:
(1) Too much interference or multipath interference.
(2) Something is wrong with the device Ethernet port.
6. Frequent packet loss, serious packet loss with several devices in the same area, it will be
better when communication channel is changed.
Same frequency interference will be caused if several DH-PFM88X are used in the same area without
separate the channels of two devices. Users are recommended to separate the frequencies of them so
as not to make the communication channels overlapped. It is recommended to make the frequency
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difference between two devices over 20M if the width of communication channel is 20M.
7. Packet loss and big time delay for ping device address of the computer
(1) Port isolation for AP which connects the same POE switch.
(2) Bad pressing and connection for cable crystal head (remake crystal head)
8. Users often lose connection and the speed is low.
(1) Too many users of AP access.
(2) Weak AP signal.
(3) Too many serious interference signals in the surrounding, client and AP are not binded.
(4) Check user number and if the upper level network bandwidth is already full.
13. Construction attention for wireless bridge and monitoring.
13.1 Construction attention
1. The horizontal direction and vertical angle of antenna
Try to make the AP antenna on the base station slope down a certain angle because the antenna
between base station and wireless bridge is directional. Meanwhile, try to make AP and client antenna
aim each other horizontally.
2. Height for setting antenna
There are some certain requirements for the distance between two points and height for setting antenna
during the actual wireless communication between two points due to the fact that the earth is a sphere.
Please refer to the following sheet for more details.
Frequency 3Km 5Km 10Km 15Km
5.8GHz 5m 7m 11m 16m
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3. Geographical environment
Place for the farthest distance of communication is sea level and clear flat land, which is the
generally-used geographical condition to evaluate the communication distance of wireless
communication devices. The second farthest are places like rural area, hill, riverbed and other half
obstacle, half open environment. The shortest communication distance is place like city building complex
or among mountains. In a word, the more intensive the obstacles are, the more influence it will cause to
wireless communication distance, especially to metal objects. Therefore, make sure the client and
access point are directly visible during the actual construction;
4. Electromagnetic environment
Direct current dynamo, grid system, switching power, electric welding machine, high frequency
electronics, computer, single chip and other devices all can cause different levels of influence to
communication distance of communication devices.
5. Climatic condition
The communication distance will be longer if the air is dry; the communication distance will be shorter if
the air is wet (especially rainy, snowy weather)
6. Try to avoid same frequency and adjacent frequency interference
Users need to search what frequencies that other devices are using first when setting the frequency of
access point, which has to avoid these frequencies as far as possible. Meanwhile, the access point
frequency has to be separated a certain distance from the surrounding frequencies which are being used
in order to prevent adjacent frequency interference. For example, when communication channel width is
20M, so it has to be separated over 20M from the frequency being used. Meanwhile, the frequency
between each AP should be set like this.
13.2 Test Situation
Testing distance: 3.5 km
Test environment: The test place is located between Beicai Town and Zhangjiang Town in Pudong New
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District City of Shanghai, and one site is located on the 12th floor in a community while the other site is
located on the 5th floor in an office building, which can basically be directly visible without any obvious
blocks.
Test result:
Frequency Signal Intensity Channel Width Throughput Rate
5825MHz -72dBm approx 20M 30-35Mbps
13.3 Reference Setting:
Set the network name according to your demand;
Country code: America;
Frequency: 5725MHz~5850MHz;
Set max output power, which can only be 9 dBm in Chinese national code; and max output power can be
9 dBm when country code is American and test mode;
Enable TDMA, which can effectively improve overall performance during point-to-multipoint
transmission;
Set channel width according to actual bandwidth demand, generally it is higher than 20M when is it 40M;
The IP address between access point and client is different; make sure there are no devices with same
IP address in the LAN;
Keep other configuration as default;
Dahua Technology Co., Ltd
Address：No.1199 Bin’an Road, Binjiang District, Hangzhou, PRC.
Postcode: 310053
Tel: +86-571-87688883
Fax: +86-571-87688815
Email:overseas@dahuatech.com
Website: www.dahuatech.com