GS Instech GRS-825DM-BC Repeater User Manual
GS Instruments Co., Ltd. Repeater Users Manual
Users Manual
FCC ID : U88-GRS-825DM-BC
HCT CO., LTD.
SAN 136-1, AMI-RI, BUBAL-EUP, ICHEON-SI, KYOUNGKI-DO, 467-701, KOREA
TEL:+82 31 639 8517 FAX:+82 31 639 8525 www.hct.co.kr
Report No. : HCT-RF09-0416 1/1
ATTACHMENT E.
- User Manual -
GRS-825DM-BC
RF Repeater
User Manual
January, 2009
Version 1.0
Bell Mobility User Manual
In-building Repeater
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- INDEX -
1. SUMMARY .................................................................................................................3
2. SYSTEM CONFIGURATION.....................................................................................5
2.1 In-buildingRepeater Service Network Configuration..........................................................5
2.2 System Design and Operation.............................................................................................6
2.2.1 System Design ..............................................................................................................................................6
2.2.2 Downlink/ Uplink Path .................................................................................................................................8
2.2.3 Frequency Selection.....................................................................................................................................9
3. SPECIFICATIONS...................................................................................................10
3.1 System Capacity ................................................................................................................10
3.2 System Specifications........................................................................................................11
3.3 Electrical and Environmental Specifications .....................................................................12
3.4 Functions...........................................................................................................................13
4. SETUP ......................................................................................................................15
5. IC INFORMATION..................................................................................................25
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In-building Repeater
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1. Summary
GRS-825DM-BC is a In-building repeater, which has been designed to improve signals in
blanket/shadow areas inside of buildings to transmit Bell Mobility’s signals at nd 800MHz
frequencies.
Characteristics
800MHz Band: 80dB Gain with 25dBm maximum composite output power.
Bandwidth:
- Downlink 880MHz~894MHz, Uplink 835MHz~849MHz (14MHz Band)
- See page 11 for more details.
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In-building Repeater
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Characteristics
GST’s In-buildingrepeater is basically a combination of 800MHz 25dBm repeaters. Functional
modules are classified as below:
- Cavity Filters to combine the Duplex input/output signals for: 800MHz.
- LNA (Low Noise Amplifier)
Gain Block to transmit output signal to PAM (Power Amplifier Module)
- Cavity Filter
- Converter Modules
- PAM Module to amplify output power linearly in accordance with optimal repeater output
power.
- Power Supply Unit
- Controller to monitor each module in repeater.
Abbreviation
PAM: POWER AMPLIFIER MODULE
LNA: LOW NOISE AMPLIFIER
AGC: AUTO GAIN CONTROL
ALC: AUTO LIMIT CONTROL
Caution: Risk of explosion if battery on the controller board is replaced by an
incorrect type.
- Statement indicating that the socket-outlet shall be installed near the equipment
and shall be easily accessible.
- This equipment is indoor use and all thecommunication wirings are limited to
inside of the building.
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2. System Configuration
2.1 In-building Repeater Service Network Configuration
<Pic.1> In-building Repeater Service Organization
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2.2 System Design and Operation
2.2.1 System Design
<Pic.2> In-building Repeater Internal Design
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<Pic.3>> In-building Repeater Port Design
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2.2.2 Downlink/ Uplink Path
In-building RF Repeater simutaneously operates at 800MHz frequencies and has one Donor ANT
Port for aiming at each BTS, and one Server Port for the In-building coverage. Therefore the
Cavity Filters applied to the Front End of Donor ANT Port and Server ANT Port consists of DPX,
has DPX which multiplexes all Tx/Rx into one path.
<Pic.4> In-buildingIn-building Repeater Block Diagram
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2.2.3 800MHz Frequency Selection
Lower B (5MHz) Upper B (5MHz) B’Blank
880 885 890 891.5 894
MHz
Lower B (5MHz) Upper B (5MHz) B’Blank
880 885 890 891.5 894
MHz
800MHz Downlink Frequency Table
Lower B (5MHz) Upper B (5MHz) B’Blank
835 840 845 846.6 849
MHz
Lower B (5MHz) Upper B (5MHz) B’Blank
835 840 845 846.6 849
MHz
800MHz Uplink Frequency Table
<Pic.6 > 800MHz Band Structure
800MHz Band Select Table
B (10MHz)
Configuration Lower B (5MHz) Upper B (5MHz) B’ (2.5MHz)
1 O O
2 O
3 O
4 O
5 O
6 O O
7 O O
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3. SPECIFICATIONS
3.1 System Capacity
Item Specification Remark
DOWNLINK 880MHz ~ 894MHz 14MHz
Frequency
UPLINK 835MHz ~ 849MHz 14MHz
Donor Tx / Rx DPX
Port Server Tx / Rx DPX
Capacity OMNI
Bandwidth 14MHz
Output Power
(ANT Port)
+25dBm / 316mW
Total
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3.2 System Specifications
Parameter Specification Remark
B+B’ DL: 880~894MHz
UL: 835~849MHz
B DL: 880 ~ 890MHz
UL: 835 ~ 845MHz
B’ DL: 891.5 ~ 894MHz
UL: 846.5 ~ 849MHz
Band Select
Lower B
or
Upper B
DL: 880 ~ 885MHz
UL: 835 ~ 840MHz
Or
DL: 885 ~ 890MHz
UL: 840 ~ 845MHz
1dB BW
Range 50dB ~ 80dB
Adjust Step ±1.0dB
Gain
Adjust Accuracy ±0.5dB
Propagation
Delay 800MHz ＜ 6.0us
F0±750kHz ＜ -45dBc ∆marker: 29dB
Spurious
Emission
F0±1.98MHz ＜ -50dBc ∆marker: 39dB
Out Band Spurious Emission ＜ -13dBm RBW: 30MHz
Flatness ＜ ±1.25dB
Return Loss / VSWR ＞ 14dB /＜ 1.5 : 1
Uplink
Noise Figure
＜ 5dB @ Max gain
＜ 8dB @ Min gain
±1.5MHz ＞ 40dBc
Roll off
±3MHz > 50dBc
Test frequency measured
from band edge
Characteristic Impedance 50Ω
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3.3 Electrical and Environmental Specifications
Item Specification Remark
RF Connector N-Type Female Donor & Server ANT Port
AC
Power
Connector DC
MS3102A-10SL (3Pin)
SCK-16-2P (2Pin)
MIL-C-5015 Type
Circular Type
AC Supply AC 120V 60Hz 3.0A
Out Dimension 450(L)*410(W)*199(H) cm
Net Weight 17.6 kgs
Module AL6063S-T5
Material Cabinet AL5052P
Operation Temperature 5 ~ +45℃℃ Convection cooling
Humidity 5% ~ 95% Non-condensing
Dust Resistance TELCORDIA GR63-CORE
Vibration Resistance 1G, 10~150Hz
0.1 Octaves/min
Environmental specifications NEMA1
MTBF 100,000 hours
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3.4 Functions
Parameter Specification
Gain Control • Adjustable DL and UL Gain range 50~80dB (800MHz)
• Display default Gain and current Gain function
AGS
Auto Gain
Setting
• AGS (Auto Gain Setting) Use for convenient Set-up
AGC
Auto Gain
Control
• It always operates in Downlink AGC ON status
• To maintain same Downlink output power despite flexible input signal strength.
• To add or subtract Attenuation level referring to AGC Power Limit level.
• Used with the Automatic Setup (Auto Gain Setting)
ALC
Auto Limit
Control
• To limit output power as far as default range
• Used for DAS configuration and when oscillation/isolation is a concern
• Automatic Gain decrement when output power of repeater is higher than default level
• Automatic Gain recovery when output power of repeater is reduced.
• Shutdown when output power is higher than default level in Minimum Gain
• Automatic Recovery Algorithm conversion after Shutdown status
Band Select • B+B’ Band (14MHz)
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Power
Monitoring
Function
• Monitoring repeater’s output level
Oscillation Check
• Isolation Check in initial set up or Reset
• Monitoring Oscillation comparing to minimum/maximum Noise Floor level
• When Oscillation occurred, repeater attempts to stabilize Isolation through Gain control function.
• Shutdown repeater when Oscillation still occurs in Minimum Gain
• Automatic Recovery Algorithm conversion after Shutdown status
Spurious
Emission Alarm
• Noise Floor Observation in case of ±2.25MHz down at the center
• In case of Noise level > –13dBm, Spurious Emission is stabilized automatically
• In case of Oscillation Spurious Emission Alarming in Minimum Gain, repeater will be shutdown
• Automatically Switch to Recovery Algorithm at Shutdown
DL Input control • Monitoring Donor ANT input power of DL
Automatic
Recovery
• When repeater is shutdown, it periodically recovers output power of repeater then monitors
alarming
Security • Support HTTPS for Web Browser security
• User authentication through User ID and Password
Temperature
Control
• Monitoring temperature of repeater
• Maximum and minimum set up is possible. Shutdown in over temperature
• Automatic recovery after temperature becomes normal. (Hysteresis 10degree)
VSWR
Monitoring
• Monitoring VSWR of Donor ANT Port (Every 90 seconds)
• Reporting VSWR Alarm and Shutdown when the rate is 3:1
• Automatic Recovery Algorithm conversion after Shutdown status
IP address
report via E-mail
• When in PPP reconnection, E-mail which includes HTML to connect to newly assigned IP Address,
reports to operator.
DHCP Client • Automatic IP assignment
DHCP Server • Server function for automatic IP assignment
Web GUI • Remote and local user browser support through Web Browser
SNMP Agent • NMS report via SNMPv2 Trap
LED Display • LED displays power and operation status on front side of repeater system.
• Input and Output signal levels are verified by LED bars.
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In-building Repeater
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4. SETUP
4.1. Equipment Needed for In-buildingRepeater Setup
Parameter Item Quantity Remark
Major Component Repeater GRS-DUO24M-BC 1 EA Provided by GST
Additional
Components
Mounting Bracket
CD which contains User Manual
V.1.0 and Installation Guide V.1.0
Ethernet Cable 6.6ft (2m)
Ground Cable 6.6ft (2m)
Ground Sems Screw M4 x 8mm
Bracket Sems Screw M6 x 16mm
Lag Screw 12.7mm x 50.8mm
Anchor Bolt Set 12.7mm x 50.8mm
1 EA
1 EA
1 EA
1 EA
4 EA
4 EA
4 EA
4 EA
Provided by GST
Antenna Donor ANT
Server ANT
1 EA
1 EA Not Included
RF Cable Antenna connection Cable TBD Not Included
Testing and Measuring
Equipment Spectrum Analyzer 1 EA Not Included
4.1.1 Checkpoints before turning on the Repeater
1) System Power Check: AC electrical power to the repeater should be 110V, input electricity
only after power verification.
2) Input RF Signal Range: Optimal input RSSI into the repeater is -55dBm ~ -25dBm for
800MHz. User should verify input condition of Donor ANT. If the input RSSI exceeds -20dBm,
then external attenuators should be used.
3) Isolation check between DONOR/SERVER ANT: Isolation condition of this equipment is
87dBc (Gain+7dB) for 800MHz. User should check its condition before installation.
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In-building Repeater
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4.1.3 System Setup
1) This equipment is basically wall mountable.
2) Installer will have to connect the power supply (after verifying the input power) and RF cable
to the Repeater and then it will be ready to use.
3) For grounding, there is a grounding terminal in main power supply which will be plugged into
power outlet. There is also a separate grounding terminal on the repeater which should be
connected to the on-site grounding terminal to ensure proper grounding.
4) Mounting of repeater should be done by at least two technicians to ensure a safe and proper
installation.
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4.1.4 Open for Service
1) Check points before open:
a. Verification of system installation status:
- Electricity, In/Out antennas, cable connection, and equipment mount status.
b. Verification of system accessories:
- User should check all necessary accessories.
c. Check receipt signal level
- Installer should check whether environmental conditions are in accordance
with system specification to ensure that system operation will be optimized.
2) Check points after open:
a. Check external LED
1) RUN: Green light ON (Off: all lights off)
2) ALARM: Green light in normal status, Red light in alarming
3) SHUT DOWN: Green light in normal status, Red light in Shutdown status
800MHz 25dBm:
Number of LED bars on front side of repeater will show input signal level.
Less than ~ -85dBm: LED 1bar
-84dBm~-67dBm: LED 2 bars
-66dBm~-49dBm: LED 3 bars
-48dBm~-31dBm: LED 4 bars
More than -30dBm: LED 5 bars
Number of LED bars on front side of repeater will show output power signal level.
Less than +5dBm: LED 1 Bar
+6dBm ~ +10dBm: LED 2 Bar
+11dBm ~ +15dBm: LED 3 Bar
+16dBm ~ +20dBm: LED 4 Bar
More than +21dBm: LED 5 Bar
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In-building Repeater
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<Pic.9> GRS-825DM-BC In-Building Repeater Front LED
b. Verification of operation status
User should verify following status with Output monitoring terminal, which is provided by
Spectrum Analyzer:
- Output power generation status, system spurious emission characteristics.
c. Verification of signal quality and strength in service area
User should verify signal strength and quality of in-service coverage area by using cell
phone or other measuring device.
d. Verification of upper-level NMS operation status
4.2 Troubleshooting
In case of abnormal operation, technician should diagnose abnormality via remote access or
directly connecting to repeater using Ethernet cable. If technician is required to conduct repairs
due to major alarm, repeater should first be powered off, and then technician should prepare
the proper measurement equipment before trying to fix the problem. In most cases of major
repairs, GST will simply replace the unit and conduct repairs at the appropriate facility.
4.2.1 Necessary Testing and Measuring Equipment
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a. RF Power Meter: 10Watt Max, 50ohm
b. Signal Generator: 3GHz
c. Spectrum Analyzer: 3GHz
d. Multi-Meter
4.2.2 Notice
a. Troubleshooting should be performed by a trained technician.
b. Parts that seem to be not used should not be disassembled.
c. While troubleshooting, technician should use attenuator to check RF Signal output.
4.2.3 Simple Troubleshooting Method
a. Verify LED Status, both on external LED’s as well as internal module LED’s
- Normal operation: Green light On. Alarming: Red LED on
b. Technician should check external and internal connectors to ensure that all connections are
tightly secure. These connectors should be cleaned regularly.
c. If technician thinks there is a serious problem, call after sales team for over-the-
phone technical support. 1-866-9-GST-USA (1-866-947-8872)
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4.2.4 Troubleshooting Guide
Item Check Point Trouble shooting
Note
before
system
operation
* System Input power range
Input Level
Downlink (800MHz) -55dBm/Total ~ -25dBm/Total
Uplink (800MHz) -55dBm/Total ~ -25dBm/Total
Note
before
system
operation
* System Gain
Gain
Downlink (800MHz) 50 ~ 80dB
Uplink (800MHz) 50 ~ 80dB
Note
before
system
operation
* Output power at Server port
Output power
Downlink (800MHz) 25dBm/Total
Uplink (800MHz) 25dBm/Total
Check in
Advance
* Check points before open for
service
* Please check quantity of all accessories with specification
before you set up.
* Fit cable length in accordance with field condition.
* Set up 800MHz Donor antenna to secure Isolation (More
than 87dBc)
Check
after
open
* Check points after open for service
* Check following status
- Verify that the antennas are securely mounted and pointed
in the correct directions
- Connection status between antennas and RF cable
- Verify that the Repeater is securely mounted
- Proper AC power status
- Grounding status of electrical circuit
- Coaxial cable (RF) construction status
- Connectors and combiners connection status
- Cable connection status against leakage of water
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4.2.5 Troubleshooting Guide Related to RF
Symptom Check Point Troubleshooting
When repeater
does not work
properly
* Check Electricity Cord
connection status
* Re-plug in AC power cord
When repeater
does not work
properly
* Checking electricity input to
AC power outlet.
* Please verify AC power input by using DVM (Digital Voltage
Meter)
When in
alarming * DL over-input alarm
* Please Check following status
- Proper maximum output power limit level
- BTS input level (Spectrum Level)
- Input RSSI value on Status Page
- Downlink Attenuation level
* Please reset AC power upon completing Alarm
troubleshooting
When in
alarming * DL over-output alarm
* Make sure output power is operating normally.
* Reset AC power upon completing Alarm
troubleshooting.
When in
alarming * UL over-output alarm
* Please make sure output level is operating normally
* Please reset AC power upon completing Alarm
troubleshooting
When in
alarming * VSWR alarm
* Check following status
- Antenna port connection
- Verify that cable from I/O filter is secure.
* Disconnect all antenna cables from the repeater, terminate all
antenna ports with 50Ohm terms and then reboot the repeater.
If the VSWR alarm still occurs then equipment should be
replaced. If the alarm goes away, then the VSWR issue is
somewhere in the cabling or connectors.
* Reset AC power upon completing Alarm
troubleshooting
When in
alarming * IF Module alarm * Verify IF Module LED is On.
* When LED is Off, module should be defective.
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When in
alarming * DL, UL PAM alarm * Reset AC power upon completing Alarm
troubleshooting
When in
alarming * DC matter/Current alarm
* Verify DC power by using DVM (Digital Voltage Meter)
* Reset AC power upon completing Alarm
troubleshooting.
When in
alarming * UL Oscillation
* Check Isolation between Donor and Server.
* Reset AC power upon completing Alarm
troubleshooting
When in
alarming * DL / UL LNA alarm
* Check connection status of LNA.
* Reset AC power upon completing Alarm
troubleshooting
When in
alarming * Temperature alarm
* Check following status:
- Setting level of maximum temperature limit
- Temperature offset is normal or not.
- Circumstances of temperature.
* Reset AC power upon completing Alarm
troubleshooting
When in
alarming * DL low-input alarm * Reset AC power upon completing Alarm
troubleshooting
When in
alarming * DL low-output alarm
* Check following status
- Output power level is normal or not.
- Whether minimum output limit level is normal.
- Compare RSSI to maximum gain.
* Reset AC power upon completing Alarm
troubleshooting
When in
alarming * RF OFF
* Verify that the HPA’s are On.
* Reset AC power upon completing Alarm
troubleshooting
When output
power is no
longer problem
* Technician should verify
category of alarm at the front
side of repeater.
* When Red light on the Shutdown LED, technician should
troubleshoot the alarm via Notebook computer.
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When output
power is no
longer problem
* Technician should connect
antenna with output port of
repeater.
* Please make sure all
connectors are fastened
* Reconnect the connector.
* Change it if the connector is defective.
When output
power is no
longer problem
* Check the input level
* Increase output power or check input change of BTS side.
When output
power is no
longer problem
* Check Gain of the unit
* If the Gain is different from normal level, please contact A/S
team.
When output
power is no
longer problem
* Cable connector loose.
* It is possible for connectors to get too tight and damage the
equipment or throughput.
* Please contact installer or service provider upon verification.
In case of
dropped call
or bad
signal after
set up
* Check input signal strength
in the service area
* Increase output power level of repeater by adjusting
attenuation level.
In case of drop
call or bad
signal after
set up
* If input signal strength is not
a problem, please check
delay of calling time.
* Increase output level of Uplink signal, then set to optimal
level.
In case of
dropped call
or bad
signal after
setup
* Check RSSI signal strength
* Contact network management team or service provider
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In case Output
Signal
wavelength is
not shown flat
or looks like
oscillation
* Check connection fastened
between antenna and cable
(Signal wavelength should be
flat and stable if technicians
shake CABLE. If not, it is
connection problem.)
* If connection is not proper, reconnect cable and connector
and then check the output power again.
Same as above * Input level change or
module overheating.
* Check input level from BTS side.
* Check performance of each module.
(Diagnosed by A/S team.)
Same as above * Please check VSWR of the
Cable is normal.
* Change to normal Cable.
4.2.6 Troubleshooting Guide Related to NMS
Symptom Check Points Troubleshooting
Link Fail * Communication problem
* In case of Ethernet, verify IP addressing, DHCP function, and
that Cookies are deleted.
* Verify that a crossover Ethernet cable is being used.
Link Fail * CLI Connection, Cable
status check
* Make sure 1:1 connection.
* Follow instructions in the installation guide for this connection
procedure.
Link Fail * CLI connection Check by
USB to Serial Cable
* Please verify Port number of PC communication.
* Please check Cable connection status.
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5. IC Information
General Information
Transmitter Antenna
This device has been designed to operate with the antennas listed below, and having a maximum gain of
80 dB. Antennas not included in this list or having a gain greater that cable loss of Antenna to Repeater t
han 12 dB are strictly prohibited for use with this device. The required antenna impedance is 50 ohms.
User Manual
Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) t
his device must accept any interference, including interference that may cause undesired operation of the
device.
To reduce potential radio interference to other users, the antenna type and its gain should be so chosen t
hat the equivalent isotropically radiated power (e.i.r.p.) is not more than that permitted for successful co
mmunication.
General Standard Specifications
User Manual
(a) The nominal passband gain (dB); Cellular: 80.0 dB
(b) The nominal bandwidth; Cellular : 15 MHz
(c) The rated mean output power; Cellular : 25.0 dBm
(d) The input and output impedances; 50 ohms
(e) The following notice: "The Manufacturer's rated output power of this equipment is for single carrier o
peration. For situations when multiple carrier signals are present, the rating would have to be reduced by
3.5 dB, especially where the output signal is re-radiated and can cause interference to adjacent band use
rs. This power reduction is to be by means of input power or gain reduction and not by an attenuator at t
he output of the device."