Nortel DualMode 800 User manual

Wireless Solutions
DualMode 800 Enclosure
Maintenance Manual
MTX08 Draft 00.01 November 1999
DRAFT
411-2051-500

Wireless Solutions
DualMode 800 Enclosure
Maintenance Manual
Document number: 411-2051-500
Product release: MTX08
Document version: Draft 00.01
Date: November 1999
Copyright Country of printing Confidentiality Legal statements Trademarks
Copyright 1999 Nortel Networks Corporation, All Rights Reserved
Printed in Canada
NORTEL NETWORKS CONFIDENTIAL
The information contained herein is the property of Nortel Networks and is strictly confidential. Except as expressly authorized in
writing by Nortel Networks, the holder shall keep all information contained herein confidential, shall disclose it only to its employees
with a need to know, and shall protect it, in whole or in part, from disclosure and dissemination to third parties with the same degree
of care it uses to protect its own confidential information, but with no less than reasonable care. Except as expressly authorized in
writing by Nortel Networks, the holder is granted no rights to use the information contained herein.
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components as
progress in engineering and manufacturing may warrant.
This equipment generates, uses and can radiate radio frequency energy. If not installed and used in accordance with the instruction
manual, this equipment may cause harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference, in which case the user will be required to correct the interference at their own expense.
DMS, DMS-MTX, DualMode, MAP and NORTEL are trademarks of Nortel Networks.
Trademarks are acknowledged with an asterisk (*) at their first appearance in the document.

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Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
Publication history
October 1999
Draft 00.01. Draft issue of document for internal review.

vi Publication history Nortel Networks Confidential
411-2051-500 Draft 00.01 November 1999

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Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
Contents 1
About this document xiii
Audience for this document xiii
Organization of this document xiv
Related documents xiv
Equipment operation 1-1
Alarm Control Unit 1-1
Selecting an option 1-3
Input option 1-4
Output option 1-6
General option 1-8
DualMode Cell Site Monitor (DCSM) 1-9
Stand-alone mode operation 1-10
The Hughes M6200 handset (NT3P75AB) 1-10
Programming the mobile 1-12
Operating the mobile 1-21
Transmit Receive Unit (TRU) 1-22
The front panel display interface 1-22
The Terminal Interface 1-26
Fullscreen commands 1-31
Command line mode commands 1-36
Multi-Channel Power Amplifier (MCPA) 1-43
Installing the MCPA software program 1-43
Running the MCPA software on the computer 1-43
Downloading the MCPA firmware to the MCPA shelf (if required) 1-46
Setting the MCPA output power 1-47
Periodic maintenance 2-1
Periodic maintenance records 2-1
Equipment in a DualMode 800 Enclosure 2-2
Transmit Receive Unit (TRU) and Multi-Channel Power Amplifier (MCPA) 2-3
High Stability Master Oscillator (HSMO) 2-3
Alarm Control Unit (ACU) 2-3
Transmit path insertion loss 2-3
Other equipment 2-3
Transmission facilities 2-3
Microwave 2-4

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Copper audio link 2-4
Power 2-4
Battery 2-4
Rectifiers 2-4
Fuses/breakers 2-4
Cabling and connections 2-4
Inside grounding 2-4
Bay bonding 2-5
Cabling and connections 2-5
Principle ground bar 2-5
Transmission line entrance 2-5
Outside grounding 2-5
Tower and associated structures 2-5
Building sheath, fences and other equipment 2-6
Antennas and tower 2-6
Structure 2-6
Tower lighting 2-6
Grounding 2-6
Paint 2-6
Feed 2-7
Antennas 2-7
Pressurized transmission lines 2-7
Site performance 2-7
Fringe coverage 2-7
Handoff checks 2-7
Antenna sweep 2-7
Housekeeping 2-8
Heating/air conditioning 2-8
Dust control 2-8
Statutory requirements 2-8
Site licenses 2-8
Trash and loose articles 2-8
Site grounds keeping 2-8
Building service 2-8
Security 2-8
Manuals and records 2-9
Schedule for periodic cell site maintenance 2-9
DualMode 800 Enclosure Maintenance Reference Chart 2-10
DualMode 800 Enclosure Every Visit Checklist 2-13
DualMode 800 Enclosure MONTHLY Checklist 2-14
DualMode 800 Enclosure QUARTERLY Checklist 2-15
DualMode 800 Enclosure SEMI-ANNUAL Checklist 2-16
DualMode 800 Enclosure ANNUAL Checklist 2-17
Test equipment and precautions 3-1
Test equipment 3-1
Precautions 3-3
Equipment warm-up 3-3
Test equipment 3-3
RF radiation hazard 3-4

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Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
Electrostatic Discharge (ESD) control 3-4
Power-up procedure 4-1
Overview 4-1
DC power inspection 4-1
Voltage checks 4-2
Master Oscillator tests 5-1
Overview 5-1
Oscillator frequency specifications 5-1
Oscillator power level test 5-2
Reference oscillator tests 5-2
Oscillator frequency test procedure using TRUs 5-4
HSMO frequency test — transceiver carrier method 5-4
Antenna and transmission line tests 6-1
Antenna direct current continuity 6-1
Antenna return loss 6-2
Antenna return loss test 6-2
Thruline wattmeter method (Antenna return loss) 6-4
Antenna sweep 6-4
Enhanced Receive Multicoupler (ERMC) tests 7-1
ERMC description 7-1
ERMC overall gain measurement test 7-1
ERMC gain adjustment 7-4
Talk-In/Talk-out (TITO) balance test 7-4
TITO test procedure 7-5
Alarm Control Unit (ACU) tests 8-1
Overview 8-1
Alarm Control Unit test setup 8-1
Performing tests using a DCSM 9-1
Introduction 9-1
Stand-alone mode tests 9-1
Stand-alone ACCH/DCCH selection 9-1
DCSM auto answer facilities 9-2
Performing tests using the DCSM in the directed mode 9-2
Monitoring functions 9-2
Posting the DCSM 9-4
Control Channel tests 9-4
MTX CTT tests 9-9
ICRM tests 10-1
DRU tests 11-1
Introduction 11-1
Functionality of the DRU 11-3

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Audio sensitivity of the TRU 11-3
Test considerations 11-4
Test equipment required 11-5
TRU self test 11-5
DRU configurations for analog tests 11-6
Nominal Application Gain 11-6
TRU setup 11-7
DRU transmit tests 11-12
Service impacts 11-12
Transmit test setup procedure 11-12
Transmit Carrier Frequency test 11-15
Wideband Modulation test 11-15
SAT Frequency and Deviation tests 11-16
Residual Modulation test 11-17
Transmit Audio Level test 11-17
Modulation Limiting test 11-18
1 kHz Tone Generation test 11-20
Setting TX audio deviation to site operational level 11-21
DRU receive tests 11-22
Service impacts 11-22
Receive test setup procedure 11-22
Receive sensitivity test 11-25
Receive and transmit audio line sensitivity test 11-25
Receive audio level test 11-26
RSSI test 11-27
RSSI offset calibration 11-29
SAT detect test 11-35
ST detect test 11-36
Setting RX audio level to site operational level 11-37
Transmit RF output power test 11-38
Transmit RF output power test setup procedure 11-38
Requirements on the Transmit RF output power test 11-40
Transmit RF output power test 11-41
Setting TRU power step size and Max power to site operational level 11-42
DRU digital tests 11-43
Digital test considerations 11-43
Bit error rate test at the MTX switch 11-44
Bit error rate test at the cell site 11-46
TDMA modulation accuracy test 11-49
TDMA call test 11-52
Enclosure maintenance 12-1
Field Replaceable Unit (FRU) 12-1
General precautions 12-4
RF radiation hazard 12-4
Electrostatic Discharge (ESD) control 12-4
Cable/connector identification 12-4
Replacing faulty common equipment (CE) units 12-5
Replacing faulty radio frequency (RF) units 12-6
Replacing the TRU or MCPA shelf 12-7

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Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
General rules for replacing a TRU or an MCPA module 12-7
Replacing the TRU 12-7
Replacing the MCPA module 12-8
Returning a faulty unit to your Nortel Networks CSO office 12-9
Appendix A: Frequency table A-1
System's channel and frequency 1
Channel frequency calculation (in the following, N = channel number) A-1
AMPS frequency allocation A-1
Appendix B: Test forms B-1
Power and grounding checks (Chapter 4) B-2
HSMO checks (Chapter 5) B-3
Antenna checks (Chapter 6) B-3
DRU checks — Transmit tests (Chapter 11) B-4
DRU checks — Receive tests (Chapter 11) B-5
DRU checks — Digital tests (Chapter 11) B-6
Figures
Figure 2-1 ACU Initial screen display 2-2
Figure 2-2 ACU menu structure 2-3
Figure 2-3 Typical Input Monitor screen display 2-5
Figure 2-4 Typical Output Monitor screen display 2-7
Figure 2-5 Controls and keypad on Hughes M6200 handset 2-10
Figure 2-6 Front panel layout of the TRU2 (NTAX98AA) 2-22
Figure 2-7 Front panel layout of the TRU3 2-23
Figure 2-8 Fullscreen display for the TRU2 2-29
Figure 2-9 Fullscreen display for the TRU3 2-30
Figure 2-10 Selection menu for the MCPA 2-44
Figure 2-11 Power setting menu for the MCPA 2-44
Figure 3-1 Equipment layout of a DualMode 800 Enclosure 3-2
Figure 6-1 Oscillator power level and frequency test setup 6-3
Figure 6-2 Oscillator frequency test setup — transceiver carrier method 6-5
Figure 7-1 Antenna return loss block diagram 7-3
Figure 8-1 RMC overall gain measurement test 8-3
Figure 8-2 Talk-In/Talk-out call setup 8-5
Figure 9-1 ACU First maintenance screen 9-2
Figure 9-2 Typical alarm connector (36-Pin) 9-3
Figure 10-1 MALT and MAHT CTTPARMS Fields 10-10
Figure 10-2 MALT Test Output MTX303 Log 10-11
Figure 10-3 MAHT Test Output MTX303 Log 10-11
Figure 10-4 MRLT and MRHT CTTPARMS fields 10-13
Figure 10-5 MRLT Test Output MTX303 Log 10-14
Figure 10-6 MRHT Test Output MTX303 Log 10-14
Figure 10-7 MRLP Test Measurements 10-15
Figure 10-8 MRLP Test results MTX302 Log 10-16
Figure 10-9 MRLR Test Measurements 10-18
Figure 10-10 MRLR Test results MTX302 Log 10-19
Figure 11-1 Front panel layout of the TRU2 (NTAX98AA) 11-2
Figure 11-2 Front panel layout of the TRU3 (NTAW99AA) 11-2

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Figure 11-3 MCPA front panel layout 11-3
Figure 11-4 DRU transmit tests setup (service affecting) 11-14
Figure 11-5 DRU receive tests setup (shelf/site service affecting) 11-24
Figure 11-6 RSSI offset setup 11-29
Figure 11-7 Transmit RF output power test setup 11-39
Figure 11-8 Transmit power level of a DualMode 800 Enclosure with 24-channel per
cell/sector using two MCPA modules 11-41
Figure 11-9 Digital loopback paths 11-43
Figure 11-10 BER test setup at the cell site 11-47
Tables
Table 1-1 Transitions in the TRU3 LED state 1-24
Table 1-2 TRU Fullscreen command summary 1-31
Table 1-3 TRU Fullscreen commands 1-32
Table 1-4 Command line mode maintenance commands 1-36
Table 1-5 Command line mode measurement commands 1-40
Table 1-6 Command line mode test commands 1-42
Table 2-1 Maintenance schedule example 2-9
Table 3-1 DRU to Interface Terminal connection 3-2
Table 4-1 Minimum bending radii of power cables 4-2
Table 4-2 RIP1 circuit breaker assignments and ratings 4-3
Table 4-3 RIP2 circuit breaker assignments and ratings 4-3
Table 4-4 RIP3 circuit breaker assignments and ratings 4-3
Table 9-1 Naming convention of the MTX trunk tests 5-9
Table 11-1 DRU configurations for analog tests 11-8
Table 11-2 RSSI characteristics 11-28
Table 11-3 DRU configuration for RSSI characteristics 11-34
Table 11-4 RSSI measurement characteristics 11-34
Table 11-5 Nominal DualMode 800 Enclosure per-carrier power level at the output
port of the MCPA shelf 11-40
Table 12-1 DualMode Urban field replaceable units 12-1
Procedures
Procedure 9-1 Posting the DCSM 9-4
Procedure 9-2 Control Channel test set-up 9-5
Procedure 9-3 Measuring forward CCH RF power 9-6
Procedure 9-4 Measuring reverse CCH RF power 9-6
Procedure 9-5 Round Robin Monitoring 9-7
Procedure 9-6 Querying ACCH OMT parameters 9-8
Procedure 9-7 Querying the DCSM parameters 9-8
Procedure 9-8 Initiating the MALT/MAHT test 9-11
Procedure 9-9 Initiating the MRLT/MRHT tests 9-13
Procedure 9-10 Initiating the MRLP test 9-16
Procedure 9-11 Initiating the MRLR test 9-18
Procedure 9-12Invoking the DTRM or MTRM tests 9-20

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Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
About this document 1
This publication is one of a set of documents that provide Nortel Networks
customers with information and suggestions on the planning, operations and
maintenance of their TDMA 800 MHz Universal Enclosure system. This set
of documents includes the following manuals:
Audience for this document
The intended audience for this set of manuals includes cell site technicians
and planning engineers who require detailed information on the planning,
operation and maintenance of a TDMA 800 MHz Universal Enclosure cell
site.
The Functional Description is a technical reference foundation for the other
documents in the documentation suite and is written for all.
The Pre-Installation Guidelines provides information on site selection,
concrete pad preparation and specifications and installation guidelines.
The RF Deployment Guide is written for system planning personnel planning
to implement new cells or expand existing cell sites.
The Maintenance Manual and the Troubleshooting Guidelines provide
information on problem recognition and preventive maintenance are written
Manual title Manual number
DualMode 800 Enclosure Functional Description 411-2051-100
DualMode 800 Enclosure Pre-Installation Guidelines 411-2051-200
DualMode 800 Enclosure RF Deployment Guide 411-2051-300
DualMode 800 Enclosure Installation Manual —
DualMode 800 Enclosure Maintenance Manual 411-2051-500
DualMode 800 Enclosure Troubleshooting Guide 411-2051-900

xiv About this document Nortel Networks Confidential
411-2051-500 Draft 00.01 November 1999
for the cell site technician to assist in troubleshooting and performing routine
work.
The document suite assumes that the reader has a basic knowledge of cellular
systems and radio propagation and is familiar with measurement units and
terms associated with these concepts. This document does not provide
detailed information on the theory of switching and radio propagation.
Organization of this document
This publication is organized to present the following information:
• overview of the TDMA 800 MHz Universal Enclosure, highlighting the
components
• layout of the equipment bays, interface module and battery pedestal
• detailed descriptions of the TDMA 800 MHz equipment, both standard
components and thoses specific to the enclosure. RF paths, channel
expansion, and field-replaceable units are also included.
• discussion of the environmental control systems (heating/cooling)
• the power systems of the enclosure, as well as grounding requirements
• technical specifications of the enclosure
• list of terms (acronyms and abbreviations)
Related documents

Nortel Networks Confidential 1-1
Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
Equipment operation 1
In a DualMode 800 Enclosure, you can communicate with the Alarm Control
Unit (ACU), the Transmit Receive Unit (TRU) and the Multi-Channel Power
Amplifier (MCPA) by the use of an interface terminal or a computer. You can
use the handset on the DualMode Cell Site Monitor (DCSM) to program the
mobile unit and perform call through test.
This chapter describes the interface commands for configuring and
programming these units in the DualMode 800 Enclosure.
Alarm Control Unit
The MAINTENANCE (Local Terminal) port located on the front of the ACU
gives direct access to the ACU MPU board. You can use this interface to
configure and monitor the alarm input points and the control output contacts.
To access the ACU for local maintenance and monitoring, you need a VT100
(or equivalent) terminal with the following settings:
Stop bit control 1 bit
Word length 8 bits
Parity none
BAUD rate 9600
Interface RS-232C
If you cannot set the terminal to the settings listed, change the ACU
configuration by setting the local terminal switch (SW3) on the MPU board to
match your terminal settings. Refer to Table 5-4 for the settings of SW3 in the
DualMode 800 Enclosure Functional Description, 411-2051-100.
When the terminal and ACU are set correctly, connect the terminal to the
MAINTENANCE port with a null modem cable. Power up the terminal, hold
the CONTROL key and press the Z key. A menu of options will appear on the
screen as shown in Figure 1-1.

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Figure 1-1
ACU Initial screen display
You can choose one of the four primary options at the first level:
• Input
• Output
• General
• Analog Ins (not used)
Each option consists of up to three lines on the screen. Figure 1-2 shows the
structure of these options.

Nortel Networks Confidential Alarm Control Unit 1-3
Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
Figure 1-2
ACU menu structure
Selecting an option
This document describes the procedure for selecting and setting the
parameters for ‘Enable Single’ in the Input option. You can use the same
procedure as an example to select the other options.
Note: The left and right arrow keys move the cursor to options on the
same line. The up arrow key moves the cursor back to the previous line
and the down arrow key moves the cursor to the next line.
1. On the first line, press the right arrow key to move the cursor to the Input
option. The options on the second line will change accordingly as the
cursor moves.
2. Press the down arrow key to move the cursor to the second line. The
cursor will highlight the first option on the second line.

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3. On the second line, press the right arrow key to move the cursor to the
Enable Single option. The options on the third line will change
accordingly as the cursor moves.
4. Press the down arrow key to move the cursor to the third line. The cursor
will highlight the first option on the third line.
5. On the third line, type in the number of the alarm input point that needs to
be enabled. Press the Return key.
Note: For options that have more than one parameter on the third line, use
the left and right arrow keys to move the cursor from one parameter to
another parameter.
6. Press the Return key a second time to execute the selected parameter of
the option. The display will show:
Command Sent...Acknowledge Received
7. Press the up arrow key to move the cursor back to the previous line.
Note: The ‘Monitor’, ‘Show Function Codes’ and ‘Firmware Info’
options do not have a third line on the menu. When selecting these
options, press the Return key after they are selected. The information for
these options will appear on the display.
Input option
You can select the following five functions under the Input option:
• Monitor
• Enable Single
• Disable Single
• Enable Range
• Disable Range
Monitor
This function monitors the status of each alarm input point. Figure 1-3 shows
a typical screen display of the Input Monitor option.

Nortel Networks Confidential Alarm Control Unit 1-5
Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
Figure 1-3
Typical Input Monitor screen display
• Alarm point 241—ROM check
• Alarm point 242—RAM check
• Alarm point 243—Non-volatile RAM check
• Alarm points 244 to 248—Reserved
For the assignment of the external input alarm points, refer to Table 3-7 in the
DualMode 800 Enclosure Functional Description, 411-2051-100.
The status of each point is displayed as follows (see Figure 1-3 for the screen
display):
• Disable/Inactive The alarm input point has been disabled either
from the MTX or the terminal and is currently not
detecting an alarm.
• Enable/Inactive The alarm input point has been enabled and is
currently not detecting an alarm.

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• Disable/Active The alarm input point has been disabled. It is
currently detecting an alarm which, because it is
disabled, will not be reported to the MTX.
• Enable/Active The alarm input point has been enabled. It is
currently detecting an alarm that has been reported
to the MTX.
You can monitor the status of the alarms continuously because the terminal
automatically updates the display every second while in the Monitor mode.
After you leave the Monitor function, the data will still be displayed until you
press the RETURN key.
Enable Single
The Enable Single function enables input alarm points one at a time. You
must enable an input alarm point before it will report alarm conditions to the
MTX.
Disable Single
The Disable Single function disables input alarm points one at a time. A
disabled input alarm point will not report alarm conditions to the MTX.
Enable Range
The Enable Range function enables a group of input alarm point at a time.
Disable Range
The Disable Range function disables a group of input alarm point at a time.
Output option
You can select the following five functions under the Output option:
• Monitor
• Open Single
• Close Single
• Open Range
• Close Range
Monitor
This function monitors the status of each output contact point. Figure 1-4
shows a typical screen display of the Output Monitor option.