Toshiba Strata AirLink User manual

May 2000
726+,%$ Telecommunication Systems Division
Wireless Systems
Installation Guide
Digital Business Telephone Systems

Publication Information
Toshiba America Information Systems, Inc., Telecommunication Systems
Division, reserves the right, without prior notice, to revise this information
publication for any reason, including, but not limited to, utilization of new
advances in the state of technical arts or to simply change the design of this
document.
Further, Toshiba America Information Systems, Inc., Telecommunication
Systems Division, also reserves the right, without prior notice, to make such
changes in equipment design or components as engineering or
manufacturing methods may warrant.
D42-IG-WDTEL-VA
4025068
Version A, May 2000
© Copyright 2000
Toshiba America Information Systems, Inc.
Telecommunication Systems Division
All rights reserved. No part of this manual, covered by the copyrights
hereon, may be reproduced in any form or by any means—graphic,
electronic, or mechanical, including recording, taping, photocopying, or
information retrieval systems—without express written permission of the
publisher of this material.
Strata is a registered trademark of Toshiba Corporation. Stratagy is a
registered trademark of Toshiba America Information Systems, Inc. Strata
AirLink is a trademark of Toshiba America Information Systems, Inc.
Trademarks, registered trademarks, and service marks are the property of
their respective owners.

Strata AirLink Installation Guide 5/00 i
Contents
Introduction
Organization............................................................................................................................................ v
Conventions............................................................................................................................................. v
Action/Response Table.................................................................................................................... vi
Related Documents/Media ....................................................................................................................vii
General Description........................................................................................................................vii
Installation and Programming ........................................................................................................vii
Feature Description.........................................................................................................................vii
User Guides/Quick Reference Guides for: .....................................................................................vii
CD-ROM ........................................................................................................................................vii
Chapter 1 – The Grand Tour
How Wireless Calls Take Place .............................................................................................................. 1
Receive Calls .................................................................................................................................... 1
Make Calls........................................................................................................................................ 1
Terminate Calls................................................................................................................................. 1
System Configurations ............................................................................................................................ 2
Base Station ...................................................................................................................................... 2
Handset ............................................................................................................................................. 2
Wireless Manager Software .................................................................................................................... 3
Strata AirLink BSIA Manager Software .......................................................................................... 3
Strata AirLink RWIU Manager Software......................................................................................... 4
Chapter 2 – Pre-installation
Step 1: Check System Hardware and Software Requirements ............................................................ 6
Step 2: Review System Component Placement ................................................................................... 6
Step 3: Review Possible System Configurations ................................................................................. 8
Single BSIA System with Two Base Stations/Single RWIU System with Four Base Stations....... 8
Multiple BSIA Systems as Single System........................................................................................ 9
Multiple Overlapping Systems ....................................................................................................... 10
Factory with Adjoining Offices...................................................................................................... 11
Manufacturing Plant ....................................................................................................................... 11
Cubicles, Walled Offices, and Conference Rooms ........................................................................ 12
Step 4: Unpack Shipment ................................................................................................................... 12
Step 5: Check Equipment List ........................................................................................................... 12
Step 6: Purchase Additional Equipment ............................................................................................ 13
Step 7: Select Suitable Locations ....................................................................................................... 13
Step 8: Set Up Temporary Installation ............................................................................................... 13
Step 9: Use Stand-alone Base Station Test Stand .............................................................................. 13
Substep A: Before You Begin ...................................................................................................... 13

Contents
Chapter 3 – BSIA System Installation
ii Strata AirLink Installation Guide 5/00
Substep B: Set Up Base Station.................................................................................................... 14
Substep C: Set Up Handsets ......................................................................................................... 14
Substep D: Audio Coverage Test ................................................................................................. 15
Substep E: Perform Handset Bit Error Rate (BER) Test.............................................................. 15
Step 10: Mount Base Stations .............................................................................................................. 16
Chapter 3 –BSIA System Installation
Step 1: Install Analog Line Module (ALM) ...................................................................................... 19
Step 2: Run Cable .............................................................................................................................. 20
Step 3: (Optional) Activate External Critical Alarm ......................................................................... 21
Step 4: Determine Base Station Power Supply .................................................................................. 21
Step 5: Connect Power Supply .......................................................................................................... 23
Step 6: Connect PC ............................................................................................................................ 23
Step 7: Install Strata AirLink Manager Software .............................................................................. 24
Step 8: Copy Upgrade Software ........................................................................................................ 25
Step 9: Configure System ................................................................................................................. 26
Substep A: Activate UTAM ......................................................................................................... 26
Substep B: Set System Time and Date ......................................................................................... 28
Substep C: Enter System Settings ................................................................................................29
Substep D: Configure Handsets ................................................................................................... 31
Substep E: Program Button Sequences ........................................................................................ 32
Substep F: Store IDs in Handset................................................................................................... 37
BSIA Additional Information ............................................................................................................... 38
BSIA (Controller) Specifications ................................................................................................... 38
Adapter and BSIA Pinouts ............................................................................................................. 38
ALM Removal................................................................................................................................ 39
Initial Configuration Change.......................................................................................................... 40
Password Change............................................................................................................................ 40
Base Station Addition..................................................................................................................... 40
Communications Port Change ........................................................................................................ 41
Chapter 4 –RWIU System Installation
Step 1: Check DIP Switches and Jumpers on PCB ............................................................................ 43
Step 2: Mount WWIS onto RWIU ..................................................................................................... 45
Step 3: Determine Proper Strata DK Slot Configuration ................................................................... 45
Step 4: Install RWIU/WWIS into Strata DK ..................................................................................... 47
Step 5: Run Cable .............................................................................................................................. 47
Step 6: Determine Base Station Power Supply .................................................................................. 48
Step 7: Connect Power Supply .......................................................................................................... 48
Step 8: Use Proper Power Factor (PF) ............................................................................................... 48
Step 9: Program Strata DK ................................................................................................................ 50
Step 10: Connect PC ............................................................................................................................ 52
Step 11: Initialize RWIU ..................................................................................................................... 52
Step 12: Install RWIU Manager .......................................................................................................... 52
Step 13: Start RWIU Manager ............................................................................................................. 53
Step 14: Set General Settings ............................................................................................................... 53
Step 15: Enter Handset IDs .................................................................................................................. 54
Step 16: Enable UTAM ....................................................................................................................... 55
Step 17: Store IDs in Handset .............................................................................................................. 56

Contents
Chapter 5 –Maintenance and Troubleshooting
Strata AirLink Installation Guide 5/00 iii
RWIU Additional Information.............................................................................................................. 57
RWIU/WWIS Interface Unit .......................................................................................................... 57
Change Initial Configuration.......................................................................................................... 66
Change Communications Ports ...................................................................................................... 66
Check RWIU and Base Station Software Versions........................................................................ 67
View Log Messages........................................................................................................................ 67
Reset Base Stations and RWIU ...................................................................................................... 68
Upgrade RWIU and Base Stations ................................................................................................. 68
Change Base Station Numbers ....................................................................................................... 69
Chapter 5 –Maintenance and Troubleshooting
Maintenance .......................................................................................................................................... 72
Charge Batteries ............................................................................................................................. 72
Discharge Batteries......................................................................................................................... 73
Password Protection ....................................................................................................................... 73
Upgrade Base Stations.................................................................................................................... 76
Troubleshooting .................................................................................................................................... 81
System Power, Polarity, and Continuity......................................................................................... 81
Components .................................................................................................................................... 81
Communications............................................................................................................................. 81
RF Link Termination ...................................................................................................................... 81
Noisy Circuits ................................................................................................................................. 81
DC Resistance................................................................................................................................. 81
System Reset................................................................................................................................... 81
Activation Code.............................................................................................................................. 81
Base Station .................................................................................................................................... 82
Replace Defective Base Station...................................................................................................... 83
Handset ........................................................................................................................................... 84
Battery ............................................................................................................................................ 85
Charger Base................................................................................................................................... 86
BSIA System .................................................................................................................................. 86
RWIU System................................................................................................................................. 94
Appendix –Specifications
Base Station Specifications................................................................................................................... 97
Handset Specifications.......................................................................................................................... 98
Grounding Requirements ...................................................................................................................... 99
FCC ....................................................................................................................................................... 99
Part 68............................................................................................................................................. 99
Part 15........................................................................................................................................... 100
UTAM, Inc.......................................................................................................................................... 100
Underwriters Laboratories (UL) ......................................................................................................... 102
Primary and Secondary Protectors ............................................................................................... 102
System Line Circuit Requirements............................................................................................... 102
Glossary ................................................................................................................................................ 103
Index ....................................................................................................................................................... 105

Contents
Chapter 5 –Maintenance and Troubleshooting
iv Strata AirLink Installation Guide 5/00

Strata AirLink Installation Guide 5/00 v
Introduction
This installation guide describes Strata AirLink™wireless systems. It provides detailed step-by-
step instructions for installing, maintaining and troubleshooting the product line. It is intended for
qualified Service Technicians (Installers).
Organization
This guide contains the following information:
♦Chapter 1 – The Grand Tour covers the Strata AirLink system components.
♦Chapter 2 – Pre-installation gives procedures that must be performed prior to installing the
Strata AirLink system.
♦Chapter 3 – BSIA System Installation contains information on installing the Strata AirLink
External Wireless system.
♦Chapter 4 –RWIU System Installation contains information on installing the Strata AirLink
Integrated Wireless system.
♦Chapter 4 –Maintenance and Troubleshooting provides instructions for basic maintenance
and troubleshooting operations for the Strata AirLink systems.
♦Appendix –Specifications covers Base Station and Handset specifications, grounding
requirements, and FCC, UTAM, Inc. and Underwriters Laboratories (UL) regulations.
♦Glossary/Index
Conventions
This manual uses these conventions:
Conventions Description
Note
Elaborates specific items or references other information. Within
some tables, general notes apply to the entire table and numbered
notes apply to specific items.
Important! Calls attention to important instructions or information.
CAUTION! Advises you that hardware, software applications, or data
could be damaged if the instructions are not followed closely.
WARNING! Alerts you when the given task could cause personal injury or
death.
Courier Shows a computer keyboard entry or screen display.

Introduction
Conventions
vi Strata AirLink Installation Guide 5/00
Action/Response Table
Helvetica Bold represents tokens. For example: M( ).
Italics represent parameter and menu/screen field names, and book titles.
For example: hot_box parameter, Extension field.
“Type”Indicates entry of a string of text.
“Press”Indicates entry of a single key. For example: Type prog then
press Enter.
Plus (+)
Shows a multiple PC keyboard or phone button entry. Entries
without spaces between them show a simultaneous entry.
Example: Esc+Enter. Entries with spaces between them show a
sequential entry. Example: #+5.
Tilde (~) Means “through.”Example: 350 ~ 640 Hz frequency range.
➤Denotes the step in a one-step procedure.
➤Denotes a procedure.
See Figure 10
Grey words within the printed text denote cross-references. In the
electronic version of this document (Library CD-ROM or FYI
Internet download), cross-references appear in blue hypertext.
1. Actions you perform
appear in this column.
They can consist of either
a single step or a series of
numbered steps.
The immediate response to the action performed appears in
this column. Additional notes and comments are also included.
2. When the action you
perform results in a
screen, menu, etc., the
screen displays to the
right.
Conventions Description
3485

Introduction
Related Documents/Media
Strata AirLink Installation Guide 5/00 vii
Related Documents/Media
Note Some documents listed here may appear in different versions on the CD-ROM, FYI, or in
print. To find the most current version, check the version/date in the Publication
Information on the back of the document’s title page.
General Description
♦Strata DK General Description
Installation and Programming
♦Strata DK Installation & Maintenance Manual
♦Strata DK Programming Manual
Feature Description
♦Strata DK Feature Description Manual
User Guides/Quick Reference Guides for:
♦Strata AirLink External Wireless Handset User Guide
♦Strata AirLink External Wireless Quick Reference Guide
♦Strata AirLink Integrated Wireless Handset User Guide
♦Strata AirLink Integrated Wireless Quick Reference Guide
CD-ROM
♦Strata DK Library CD-ROM
For authorized users, Internet site FYI (http://fyi.tsd.toshiba.com) contains all current Strata DK
documentation and enables you to view, print, and download current publications.

Introduction
Related Documents/Media
viii Strata AirLink Installation Guide 5/00

Strata AirLink Installation Guide 5/00 1
The Grand Tour 1
This chapter tells you how wireless calls take place and gives you the basic system
configurations.There are two available configurations:
♦Strata AirLink External Wireless System –The basis for this system is the Base Station
Interface Adapter (BSIA) system that interfaces to Strata DK systems and many non-Toshiba
systems using the standard telephone ports.
♦Strata AirLink Integrated Wireless System –The basis for the integrated version is the
RWIU system that interfaces to Strata DK16, DK16e, DK40, DK40i, DK280, DK424 and
DK424i using a proprietary RWIU Printed Circuit Board (PCB).
Strata AirLink operates in single building and campus environments in the 1920~1930 MHz band.
This bandwidth is designated by the Federal Communication Commission (FCC) for unlicensed
operation, and an FCC license is not required to install and operate the system.
How Wireless Calls Take Place
Wireless telephone calls are similar to other calls that take place in a telephone system, except that
a Radio Frequency (RF) link is used from a Base Station.
The BSIA/RWIU and handset are assigned unique identification (ID) numbers. The handset must
have a BSIA/RWIU ID before it can communicate with a Base Station. Up to eight system IDs can
be programmed into a handset enabling operation in multiple wireless systems.
Receive Calls
The BSIA/RWIU receives a call for a specific handset and sends the call to all Base Stations. The
handset responds to the Base Station to which it is locked. The Base Station establishes an RF link
to the BSIA/RWIU, and the call proceeds like any other call.
Make Calls
When you make a call, the handset locks onto a channel on the Base Station. The Base Station
transmits the calling information to the BSIA/RWIU, and the call proceeds as any other call.
Terminate Calls
When you end a call, a signal is sent to the BSIA/RWIU freeing a voice channel and changing the
handset to standby. The BSIA/RWIU sends a release message to the Base Station and the RF link
is terminated.

The Grand Tour
System Configurations
2Strata AirLink Installation Guide 5/00
System Configurations
The BSIA system supports up to two Base Stations and one BSIA or controller. The RWIU system
supports up to four Base Stations and interfaces directly to the Strata DK system without using a
controller. Both systems support up to 32 handsets.
Base Station
Each Base Station (see Figure 1) provides 4
or 8 simultaneous speech paths and up to
320,000 square feet of calling coverage for
either system. Since handsets are not in
continuous conversation, a system can
support more than 8 handsets, up to a
maximum of 32. Multiple systems can be
active simultaneously.
The Base Station has radio transmitters and
receivers that relay calls between the BSIA or
RWIU, handsets, other telephones and trunks.
It has four external antennas that enable the
best choice for receiving and transmitting the
strongest signal.
The Base Stations can be mounted on walls or ceilings up to 2,000 feet from the system, using
twisted-pair continuous cable. They receive power directly or locally. If powered locally, they can
be installed up to 3,300 feet from the system. LEDs provide diagnostic information for System
Administrators or technical personnel (see Table 23 on Page 82).
In typical office environments, each Base Station has a
broadcast range (see Figure 2) of up to 300 feet. They
can also be placed one meter apart in the same
coverage area to increase traffic capacity without
interference.
The Base Station software is easily upgraded from the
BSIA or RWIU, simplifying system administration
and eliminating the need to remove the Base Stations
for system upgrades.
Handset
The handset is small, lightweight, and easy to use. Its Liquid Crystal Display (LCD) shows
alphanumeric information and icons that report status. It has many features depending upon the
interfacing telephone system. The handsets used with the RWIU system have many of the same
Strata DK Digital Telephone (DKT) features.
Unique Electronic Serial Numbers (ESNs) are programmed into the handsets at the factory and are
automatically configured the first time a call is made.
3399
Antennas
LEDs
Antennas
Figure 1 Base Station
Base Station
Broadcast Range - 300 Feet
2967
Figure 2 Broadcast Range

The Grand Tour
Wireless Manager Software
Strata AirLink Installation Guide 5/00 3
Wireless Manager Software
There is a version of manager software for each of the wireless systems: Strata AirLink BSIA
Manager Software and RWIU Manager Software. The software enables you to configure the
wireless system from a PC desktop. See Step 7‚“Install Strata AirLink Manager Software”on Page
24 and Step 12‚“Install RWIU Manager”on Page 52 for installation instructions.
Strata AirLink BSIA Manager Software
The Strata AirLink BSIA Manager software is a Windows 95 application that includes:
♦Easy-to-use Desktop Toolbar for navigation
♦Configuration Window for setting system parameters and handset features
♦Status Window to view system alarms
♦Upgrade icon for immediate upgrades to the BSIA and Base Stations
♦Viewable or printable log files
♦Online Help
Desktop Toolbar
When you open the Strata AirLink BSIA
Manager software from its Program
Group, the Desktop Toolbar displays
(shown at the right).
Use this toolbar to easily configure the
system, access the Status Window,
upgrade the system, edit and save log
files, access online Help, and exit the
program. The toolbar can be placed anywhere on your desktop.
Configuration Window
The Configuration Window accesses the databases that set system parameters, user settings, and
feature button sequences. The button sequences enable the handsets to use the office telephone
system features.
Status Window
The Status Window, accessed from the Desktop Toolbar, gives you valuable system activity
information. It is an excellent troubleshooting tool. You can check the status of Base Stations,
lines, and calls. You can also clear critical alarms and make a software version inquiry.
Exit Help
Configuration
Window
Log Files
Status Window System Upgrade
3401

The Grand Tour
Wireless Manager Software
4Strata AirLink Installation Guide 5/00
Strata AirLink RWIU Manager Software
The Strata AirLink RWIU Manager software is a Windows 95 application that includes:
♦Easy-to-use Desktop Toolbar for navigation
♦Configuration Window for setting the system ID, handset IDs, time and date, and
communication ports
♦Status Window to view software versions, log messages, reset the Base Stations and/or the
RWIU
♦Software Upgrade Window for immediate upgrades to the RWIU and Base Stations
Desktop Toolbar
When you open the Strata AirLink
RWIU Manager software from its
Program Group, the Desktop Toolbar
displays (shown at the right).
Use this toolbar to easily configure
the system, access the Status
Window, upgrade the software,
activate UTAM, and exit the
program. The toolbar can be placed
anywhere on your desktop.
Exit
Help
UTAM
Software
Status
Configuration
Window Window Upgrade Activation

Strata AirLink Installation Guide 5/00 5
Pre-installation 2
This chapter provides common step-by-step pre-installation procedures and several sample
configurations for both Strata AirLink Wireless systems. The configurations range from a single
system with one or two Base Stations to multiple-overlapping systems. The anticipated coverage
of 320,000 square feet per Base Station and a maximum number of 32 users for each system was
used to layout the samples.
It is highly recommended that a site survey and BER test be conducted to assist in the careful
planning of Base Station placement, ensuring the highest possible quality of coverage. The survey
should include:
♦Location of Base Stations
♦Maximum broadcast range required from any Base Station
♦High traffic areas and general coverage areas, such as conference rooms, cafeterias, and
manufacturing floors
♦Obstructions between Base Stations and handsets
♦Office locations and number of handsets within each location
♦Construction materials used in walls, including the insulation, and floors between multistory
buildings
♦Window coatings and coverings
♦Large metal objects, such as equipment, doors, and fluorescent lamp shades
♦Distance of Base Stations from the BSIA or RWIU
There are special installation requirements to meet Underwriters Laboratories (UL) 1459
regulations in the United States that are explained in the “Underwriters Laboratories (UL)”on
Page 102.

Pre-installation
Step 1: Check System Hardware and Software Requirements
6Strata AirLink Installation Guide 5/00
Step 1: Check System Hardware and Software
Requirements
Table 1 lists the minimum hardware and software that your PC must have to use the Strata AirLink
Manager software.
Important! Windows 3.11/3.1 is a 16-bit application and the Manager software is 32-bit. To run
the Manager software, a special 32-bit support expansion is required.
Step 2: Review System Component Placement
A review of component placement before installation will help to reduce or eliminate attenuation.
Attenuation is loss of RF signal strength due to distance, antenna positioning, and/or obstructions.
The loss is measured in decibels (dBs).
Increases or reductions of three dBs result in doubling or halving signal strength. Try to limit the
total loss to 100 dBs (see Figure 3).
Figure 3 Loss of Signal Strength by Distance (Direct Line of Sight)
Table 1 Hardware and Software Requirements
Minimum Recommended
Hardware 386DX 33 MHz 486DX2 66 MHz
Hard Drive 1.5MB 3MB
Random Access Memory
(RAM) 4MB 8MB
Video VGA SVGA
Mouse Any supported by Windows Same
Floppy Drive 1.44 MB 3.5 inch Same
Software Microsoft Windows 3.11/3.1 Windows 98/95
11020 50 100
-30
40
-50
60
-62
72
-78
88
-90
100
2974
Power:
Loss:
Base
Station
Distance in Meters
dB

Pre-installation
Step 2: Review System Component Placement
Strata AirLink Installation Guide 5/00 7
Table 2 shows attenuation obstruction caused by common materials in a building.
➤To reduce or eliminate attenuation and fading
1. Begin the signal path without obstructions even
though signals can travel through obstacles (see
Figure 4).
2. If obstructions cannot be avoided, do not place
the Base Stations:
♦On or near metallic objects or on walls that
have metallic content such as metal girders
or foil-backed insulation.
♦Near large obstructions; for example, doors
that could temporarily obstruct antennas
when the doors open.
3. Place components in locations that ensure clear
line of sight signaling between the Base Station
and handset.
Note In general, for optimum coverage and reduced signal fading, it is recommended that the
coverage by the Base Station overlap by approximately 25 percent. Base Stations are
designed to automatically use frequencies that are not already in use, so interference
between the Base Stations is not a problem.
4. Plan coverage for each floor separately in multi-story environments. A single Base Station can
support multiple floors. The guidelines for ensuring proper broadcast ranges and maximum
traffic must be followed.
5. Consider the high traffic areas and install the number of Base Stations required to meet the
estimated traffic demand. When multiple Base Stations are needed in the same location, you
can mount Base Stations as close as one meter apart.
Table 2 Signal Attenuation Obstruction
Object Approximate
dB Loss
Concrete 20
Concrete with metal siding 30
Brick 15
Plaster 10
Walls with windows 10
Walls with metal coating 20
Venetian blinds
Open
Closed
10
20
Soft partitioning 3 to 4
2975
Base Station Corridor
Corridor
Figure 4 Maximum Line of Sight

Pre-installation
Step 3: Review Possible System Configurations
8Strata AirLink Installation Guide 5/00
Each Base Station can support eight or
more simultaneous conversations. Figure
5shows 2 Base Stations supporting 32
handsets in a manufacturing area.
6. Use corridors because they can act as
natural pathways for RF signals. When
trying to cover two types of areas, place
a Base Station near a corridor to
optimize coverage in both areas.
Note Handoff does not operate between
Base Stations connected to different
wireless systems.
Step 3: Review Possible System Configurations
It is highly recommended that you follow the installation guidelines and examples in this step. The
maximum number of Base Stations that the BSIA system supports is two, and the RWIU system,
four.
Some configurations are:
♦Single BSIA system with two Base Stations or single RWIU system with four Base Stations
♦Multiple BSIA systems as a single system
♦Multiple overlapping systems
♦Factory with adjoining offices
♦Manufacturing plant
♦Cubicles, walled offices, and conference rooms
Single BSIA System with Two Base Stations/Single RWIU System with Four
Base Stations
Single BSIA system with two Base Stations (see Figure 6) or single RWIU system with four Base
Stations (see Figure 7). The Base Stations are placed in locations that optimize the requirements of
the system. For example, the Base Stations could be placed in the same general area or on separate
floors, but with overlapping coverage
Figure 6 BSIA System with Two Base Stations
320'
Concrete Concrete
Manufacturing Floor
(32 handset users)
Base
Station 1
Base
Station 2
2973
168'
Figure 5 Increasing Traffic Capabilities
Base Station 1
Base Station
Broadcast Area
2969
Base Station 2
BSIA

Pre-installation
Step 3: Review Possible System Configurations
Strata AirLink Installation Guide 5/00 9
Figure 7 RWIU System with Four Base Stations
Multiple BSIA Systems as Single System
This configuration (see Figure 8) creates a system with greater coverage area. The handsets must
be programmed with both system IDs. Users can place and receive calls, although handoff does
not automatically operate between Base Stations connected to different BSIAs. Manually invoke
handoff by using )/6+ to hold the call while moving between Base Station 4 and 2, for example.
System Identification numbers (SIDs) for both BSIAs must be programmed in the handset for this
operation.)
Figure 8 Multiple BSIAs in One System
Base Station 1
Base Station
Broadcast Area
3731
Base Station 2
Base Station 3 Base Station 4
Strata DK
RWIU
2971
Base
Station 1
Base Station Broadcast Area
Base
Station 2
BSIA 1
Base
Station 3
Base
Station 4
BSIA 2
Double punch down
to BSIAs 1 and 2
Analog lines (32)
from the office
telephone system

Pre-installation
Step 3: Review Possible System Configurations
10 Strata AirLink Installation Guide 5/00
Multiple Overlapping Systems
Multiple overlapping configurations (see Figure
9) create a system with greater user capacity.
This configuration works for the BSIA or RWIU
systems.
Use Table 3 to determine how many Base
Stations are needed to accommodate the
numbers of users at different traffic levels.
Note It is assumed that users have access to
all Base Stations in a high-traffic
environment where only one call is
blocked out of 100 attempts.
Table 3 Base Station Traffic Requirements
Erlangs1
Per User
1. Typical usage assumes .1, .15, and .2 Erlangs (6 minutes, 9 minutes, and 12 minutes, respectively, where 1
Erlang equals 60 minutes of usage) per line during the busiest hour of the day.
Number
of Users
Total
Erlangs
Equivalent
CCS2
2. CCS stands for centi-call seconds, or 100 seconds of telephone conversation.
Required
Channels
Base Stations
Required
.1
10 1 36 5 1
20 2 72 6 1
30 3 108 8 1
32 3.2 115.20 8 1
.15
10 1.5 54 6 1
20 3 108 8 1
323
3. Assumes Base Stations are co-located.
4.8 172 11 2
.2
10 2 72 6 1
16 3.2 115.20 8 1
3236.4 230.4 13 2
3729
Base Station
Broadcast Area
Base Station 1
Base Station 3
Base Station 2
Base Station 4
Strata DK
RWIU
Strata DK
RWIU
Figure 9 Multiple Overlapping Systems