Psion WLPC24H User Manual 80440 1 intro

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Document ID	77379
Application ID	vAIUo58QjHeHnEMFgOUPwA==
Document Description	Teklogix 9150 Wireless Gateway User Manual Chapter 1 Introduction
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	50.5kB (631214 bits)
Date Submitted	1999-12-20 00:00:00
Date Available	2000-04-04 00:00:00
Creation Date	1999-07-26 10:30:33
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	1999-07-30 17:19:55
Document Title	80440.book(1_intro.fm)
Document Creator	FrameMaker 5.5.6p145

INTRODUCTION
1.1 About This Manual . . . . . . . . . . . . . . . . . .
1.2 Text Conventions. . . . . . . . . . . . . . . . . . . .
1.3 About The 9150 . . . . . . . . . . . . . . . . . . . .
1.3.1 Base Station Functions . . . . . . . . . . .
1.3.2 Mini-Controller Functions . . . . . . . . .
1.3.3 Access Point Functions . . . . . . . . . .
1.4 Radio Options . . . . . . . . . . . . . . . . . . . . .
1.5 Radio Protocols . . . . . . . . . . . . . . . . . . . .
1.5.1 Adaptive Polling/Contention Protocol . . .
1.5.2 Wlan Protocol . . . . . . . . . . . . . . .
1.5.3 IEEE 802.11 Protocol . . . . . . . . . . .
1.5.3.1 Inter-Access Point Protocol (IAPP) .
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Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
About This Manual
1.1 About This Manual
This manual contains information about the installation, basic operation, and
configuration of the 9150 Wireless Gateway.
Chapter 1: Introduction
describes the 9150 and the radio protocols it supports.
Chapter 2: Installation Requirements
describes the physical installation of the Teklogix 9150 Wireless Gateway and
how to connect to the 9150 for configuration and diagnostics.
Chapter 3: 9150 Main Configuration
describes the options available from the main configuration menus.
Chapter 4: Base Station Configuration
describes the configuration for a 9150 used as a base station linked to a
network controller.
Chapter 5: Mini-Controller Configuration
describes the configuration for a 9150 used as a mini-controller.
Chapter 6: Access Point Configuration
describes the configuration for a 9150 used as an access point device between
wired and wireless networks.
Chapter 7: Specifications
outlines the performance specifications for the 9150.
Appendix A: Port Pinouts And Cable Diagrams
includes pinouts and diagrams of the ports and cables for the 9150.
Appendix B: MAC Bridge Protocol Filters and OUIs
presents tables of values for Ethernet II and DSAP/SSAP types, and OUI.
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
Text Conventions
1.2 Text Conventions
Note:
Notes highlight additional helpful information.
Important:
These statements provide particularly important instructions or
additional information that is critical to the operation of the
computer and other equipment.
Warning:
These statements provide important information that may prevent
injury, damage to the equipment, or loss of data.
1.3 About The 9150
The 9150 Wireless Gateway is designed to support a wide variety of system configurations. Using the IEEE 802.11 Wireless LAN Standard, the 9150 is capable of
operating as a transparent bridge (access point) between wireless and wired networks.
This allows wireless clients to access the network and also move seamlessly between
the 9150s in the network. The 9150 can also operate as a Teklogix base station or a
mini-controller.
The 9150 supports Type II PCMCIA cards so that multiple radio interfaces are possible. The 9150 also has dual-radio functionality. It can support several combinations of radio types to function as both a mini-controller and base station, access
point and base station, or access point and mini-controller. For details, see “Radio
Options” on page 7.
The 9150 Flash memory holds the boot code, configuration parameters and firmware. The 9150 Configuration program allows various parameter settings to be
changed, added or deleted. The Flash can be reconfigured remotely via the network
using a standard HTML Web Browser such as Netscape or MS Internet Explorer
(for instructions, see Chapter 3: “9150 Main Configuration”).
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
About The 9150
Figure 1.1 The 9150 Wireless Gateway - Front View
Figure 1.2 The 9150 Wireless Gateway - Bottom View
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
Base Station Functions
1.3.1 Base Station Functions
As a base station, the 9150 provides a link between the local area network and the
wireless network consisting of Teklogix mobile terminals, and base stations such as
the 9140 Wireless Gateway. The 9150 and 9400/9300 Network Controller (or host
using a Teklogix Software Development Kit) communicate using the 9010 proprietary protocol with TCP/IP over Ethernet, Token Ring or serial connectivity. Wlan
protocol enables the 9150 to communicate with 9140s without cable attachments
(see Figure 4.1 on page 47).
For information on configuring the 9150 as a base station, see Chapter 4: “Base
Station Configuration”. For details on Wlan, see “Wlan Protocol” on page 8.
1.3.2 Mini-Controller Functions
The 9150 is equipped with some emulation capabilities, allowing it to act as a minicontroller. When a 9150 is configured as a mini-controller, Teklogix terminals can
emulate an ANSI, 5250 or 3274 terminal via a 9150 rather than through a 9400/9300
Network Controller.
To configure the 9150 as a mini-controller, see Chapter 5: “Mini-Controller Configuration”. For a generalized system diagram, see Figure 5.1 on page 78.
1.3.3 Access Point Functions
As an access point, the 9150 Wireless Gateway forms a communication link
between Teklogix RF terminals or wireless access point clients and a Teklogix
Network Controller or a host computer. It communicates over an IEEE 802.11 RF
data link with terminals and over a cable with a network controller or a host computer. The 9150 can be connected to the network through an Ethernet or Token Ring
connection. The diagram in Figure 6.1 on page 125 illustrates a 9150 access point
connection between a Teklogix 9400 Network Controller on Ethernet and IEEE
802.11 wireless devices. Figure 1.4 on page 12 shows a generalized Token
Ring configuration.
For information on the 9150 as an access point, see “IEEE 802.11 Protocol” on
page 10 and Chapter 6: “Access Point Configuration”.
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
Radio Options
1.4 Radio Options
The 9150 supports Type II PCMCIA cards so that multiple radio interfaces are possible.
There is one internal and one external PC card slot available. The type of PCMCIA
radio card installed in the 9150 is dependent on your wireless network. Currently
supported radios are:
•
TRX7370 Narrow Band DSP.
•
TekLAN 902 MHz DS Spread Spectrum (TRX7410).
•
TekLAN 2.4 GHz DS Spread Spectrum (TRX7425).
•
Proxim RangeLAN802 IEEE 802.11 FHSS 2.4 GHz (TRX7440).
•
Lucent WaveLAN IEEE 802.11 DSSS 2.4 GHz (TRX7430).
The 9150 has dual-radio functionality. It can support several combinations of radio
types to function as both a mini-controller and base station, access point and base station, or access point and mini-controller. The 902 MHz, 2.4 GHz (802.11 and TekLAN)
and Narrow Band radios can be used in any combination, with the exception of dual
TekLAN or dual Narrow Band radios.
Important:
The radio in the terminal must match the radio in the 9150 Wireless
Gateway. If changing radio types in the 9150, DO NOT “hot swap”
the PC cards: Turn the 9150 off before changing the radio.
1.5 Radio Protocols
RF protocols allow terminals to communicate with a base station by sharing the use
of a radio channel in an efficient way. Teklogix systems use one of three types of RF
protocols: the Teklogix Adaptive Polling/Contention protocol, the Teklogix
Wireless LAN (Wlan) protocol, or the non-proprietary IEEE 802.11 protocol.
When used as a base station, the 9150 uses either the Adaptive Polling/Contention
protocol or the Wlan protocol. These two protocol types cannot be mixed on a
single system. When used as an access point device, the 9150 employs the
IEEE 802.11 protocol. These protocols are described in the following sections.
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
Adaptive Polling/Contention Protocol
1.5.1 Adaptive Polling/Contention Protocol
The Adaptive Polling/Contention protocol is always used on Narrow Band radio
systems with baud rates of up to 19.2 kbps, and may also be used on Spread Spectrum systems at higher rates.
Terminals operating with this protocol do not transmit unless they receive polls from
the 9150. Terminals are generally polled en masse. Following each poll, groups of
terminals are assigned response windows in which they may respond to the poll.
If a “collision” occurs – more than one terminal attempts to respond in a particular
window – the 9150 that is polling divides and reassigns that group until the
colliding terminals can respond without a collision.
Adaptive features of this protocol allow the response windows to be adjusted to
accommodate high or low RF traffic conditions, and to prevent data from being
queued too long when a particular terminal has a burst of data to send or receive.
Systems using adaptive polling/contention can use the cellular option so that
terminal operators can roam the site, maintaining uninterrupted communication as
they pass between coverage areas.
If cellular base is not enabled, a “RESET: Press Enter” message appears on the
terminal screen each time an operator moves from one base station coverage area to
another. (Pressing  restores communication, but some data may be lost.)
1.5.2 Wlan Protocol
The Wlan (Wireless LAN) protocol is used only on Spread Spectrum radio systems
at baud rates of 122 kbps and higher. The Wlan protocol allows base stations to be
added to a system without cable connections. A Wlan system consists of a minimum
of one wired base station and zero or more wireless base stations. It can operate on
either one channel – usually the case – or on multiple channels.
When a Wlan system is operating, base stations do not send out polls. Instead, both
wired and wireless base stations regularly broadcast routing information, indicating
the available routes back to the controller. Both terminals and wireless base stations
receive these broadcasts, determine the best communication route, and send their
messages. If a better route becomes available, the terminal or wireless base will
change communication paths.
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
Wlan Protocol
Only one base station or terminal may transmit at one time. When the channel
is clear, a combination of preset priorities and random choices determines who
“goes next”. Even if two transmitters attempt to send at the same time, message
acknowledgements and retransmissions prevent any data from being lost.
Terminals moving through the Wlan communicate with the base stations that
provide the best communication path to a wired base station. If multiple channels
are used, the terminal looks for a better channel only if it cannot find an acceptable
path back on its current channel.
Note:
For detailed information on configuring the 9150 as a base station, please
see Chapter 4: “Base Station Configuration”. For a generalized system
diagram, see Figure 1.3, below.
8055 Vehicle-Mount
RF Terminal
9150
Wireless Gateway
HOST
ETHERNET
TCP/IP
SERIAL
9400
Network Controller
9140
Wireless Gateway
9150
Wireless Gateway
7030 Hand-Held
RF Terminal
Figure 1.3 9150 LAN And Serial Configuration
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
IEEE 802.11 Protocol
1.5.3 IEEE 802.11 Protocol
The IEEE 802.11 protocol is an OSI standard for Wireless Local Area Networks
(WLANs). With this standard, any IEEE 802.11 radio can communicate with any
other similarly-equipped device. However, IEEE 802.11 does not provide a standard
for a total WLAN system. IEEE 802.11 solely standardizes two communications
layers: Physical (PHY) and Medium Access Control (MAC). Three different PHY
layer media are covered: 2.4 GHz Direct Sequence Spread Spectrum radio,
2.4 GHz Frequency Hopping Spread Spectrum radio, and infrared. Each station
in a WLAN system has its own unique MAC address.
Important:
Equipment using one physical medium (e.g. Frequency Hopping
versus Direct Sequence) will not interoperate with equipment using
a different physical medium.
IEEE 802.11 uses 2.4 GHz radios of relatively low power. The range is limited
to no more than a hundred feet or so, depending on the conditions, and is usually
restricted to “line of sight” operation. Therefore, most wireless networks need more
than one coverage area, with terminals moving between the areas. To integrate
those areas, systems using IEEE 802.11 protocol for their wireless networks
require an IEEE 802.11-equipped bridge device (or access point), such as the
9150 Wireless Gateway.
Using bridging software, the 9150 Wireless Gateway enables communication
between any wireless IEEE 802.11-equipped stations and LAN stations operating
on Ethernet or Token Ring. The 9150 itself is resident on the LAN and functions as
a MAC bridge, providing transparent integration between the stations on the wireless and wired networks.
Each terminal is associated with one 9150. A frame from an RF terminal is sent to
the 9150 that the terminal is associated with. The terminal puts a destination MAC
address in the frame, which specifies a hardware address on the wired LAN side.
Because the receiving 9150 is connected to an Ethernet or Token Ring network, it
encapsulates the data in an Ethernet or Token Ring frame, respectively, including the
destination MAC address specified by the terminal. The 9150 then sends the frame
onto the physical network; the frame is picked up by whichever device is at the destination hardware address.
10
Teklogix 9150 Wireless Gateway User Manual
Chapter 1: Introduction
IEEE 802.11 Protocol
When sending frames from the LAN side, the sending device puts the MAC address
of the terminal in the frame header. Whichever 9150 has that terminal associated
with it, takes the frame and passes it over the RF to the terminal. By passing frames
in this way, the 9150 is acting as a MAC bridge.
1.5.3.1
Inter-Access Point Protocol (IAPP)
The Inter-Access Point Protocol (IAPP) is an extension to the IEEE 802.11 protocol.
IAPP facilitates roaming of mobile stations across different Basic Service Sets
(groups of stations and their access points), and specifies how access points communicate with each other.
In a multiple-9150 system, IAPP informs the other 9150 Wireless Gateways when a
new 9150 becomes active, and enables the awareness of the 9150s of each other.
With IAPP, an IEEE 802.11 system can operate on one or more channels, with
terminals moving between the 9150s. Although each terminal is associated with one
9150, it can reassociate with another 9150 to maintain uninterrupted communications. The newly-associated 9150 will receive the terminal’s data frames and pass
them onto the LAN. Returning frames are no longer accepted by the original 9150,
which has disassociated from that terminal. The returning frames are now accepted
by the newly-associated 9150 and passed over the RF to the terminal.
Note:
For detailed information on configuring the 9150 as an access point,
please see Chapter 6: “Access Point Configuration”. For a generalized
system diagram, see Figure 1.4 on page 12.
Teklogix 9150 Wireless Gateway User Manual
11
Chapter 1: Introduction
IEEE 802.11 Protocol
7040 Hand-Held
RF Terminal
HOST
9150
Wireless Gateway
7035 Hand-Held
RF Terminal
7040 Hand-Held
RF Terminal
9400
Network Controller
9150
Wireless Gateway
7035 Hand-Held
RF Terminal
Figure 1.4 9150 Access Point Configuration
12
Teklogix 9150 Wireless Gateway User Manual

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