Paradyne HOTWIRE 7900 User Manual

HOTWIRE

MODEL 7900

BASIC MAINTENANCE

PROCESSOR

USER’S GUIDE

Document No. 7900-A2-GB20-00

March 1998

Copyright  1998 Paradyne Corporation.
All rights reserved.
Printed in U.S.A.

Notice

This publication is protected by federal copyright law. No part of this publication may be copied or distributed,
transmitted, transcribed, stored in a retrieval system, or translated into any human or computer language in any form
or by any means, electronic, mechanical, magnetic, manual or otherwise, or disclosed to third parties without the
express written permission of Paradyne Corporation, 8545 126th Ave. N., Largo, FL 33773.

Paradyne Corporation makes no representation or warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for a particular purpose. Further, Paradyne Corporation
reserves the right to revise this publication and to make changes from time to time in the contents hereof without
obligation of Paradyne Corporation to notify any person of such revision or changes.

Changes and enhancements to the product and to the information herein will be documented and issued as a new
release to this manual.

Trademarks

All products and services mentioned herein are the trademarks, service marks, registered trademarks or registered
service marks of their respective owners.

Warranty, Sales, and Service Information

Contact your local sales representative, service representative, or distributor directly for any help needed. For
additional information concerning warranty , sales, service, repair , installation, documentation, training, distributor
locations, or Paradyne worldwide office locations, use one of the following methods:

 Via the Internet: Visit the Paradyne World Wide W eb site at http://www.paradyne.com
 Via Telephone: Call our automated call system to receive current information via fax or to speak with a

company representative.

— Within the U.S.A., call 1-800-870-2221
— Outside the U.S.A., call 1-727-530-2340

Printed on recycled paper

A

March 1998

7900-A2-GB20-00

Important Regulatory Information

Important Safety Instructions

1. Read and follow all warning notices and instructions marked on the product or included in the manual.

2. Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation of the product and to
protect it from overheating, these slots and openings must not be blocked or covered.

3. Do not allow anything to rest on the power cord and do not locate the product where persons will walk on the
power cord.

4. Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous
high voltage points or other risks. Refer all servicing to qualified service personnel.

5. General purpose cables are provided with this product. Special cables, which may be required by the regulatory
inspection authority for the installation site, are the responsibility of the customer.

6. When installed in the final configuration, the product must comply with the applicable Safety Standards and
regulatory requirements of the country in which it is installed. If necessary , consult with the appropriate regulatory
agencies and inspection authorities to ensure compliance.

7. A rare phenomenon can create a voltage potential between the earth grounds of two or more buildings. If
products installed in separate buildings are interconnected, the voltage potential may cause a hazardous
condition. Consult a qualified electrical consultant to determine whether or not this phenomenon exists and, if
necessary, implement corrective action prior to interconnecting the products.

8. In addition, if the equipment is to be used with telecommunications circuits, take the following precautions:

— Never install telephone wiring during a lightning storm.
— Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
— Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the

network interface.

— Use caution when installing or modifying telephone lines.
— Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote risk of

electric shock from lightning.

— Do not use the telephone to report a gas leak in the vicinity of the leak.

7900-A2-GB20-00 March 1998

B

Important Regulatory Information

EMI Warnings

!

WARNING:

This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance
with the instruction manual, 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 his own expense.

The authority to operate this equipment is conditioned by the requirements that no modifications will be
made to the equipment unless the changes or modifications are expressly approved by Paradyne
Corporation.

In order to maintain compliance with FCC Part 15 Rules, the ferrite choke must be installed on the V.35
cable. Refer to the installation instructions.

!

WARNING:

To Users of Digital Apparatus in Canada:
This Class A digital apparatus meets all requirements of the Canadian interference-causing equipment

regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du règlement sur le matérial

brouilleur du Canada.

C

March 1998

7900-A2-GB20-00

Contents

About This Guide

H Document Purpose and Intended Audience v. . . . . . . . . . . . . . . . . . . . . . . . .

H Document Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Product-Related Documents vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 About the Hotwire Model 7900 Basic Maintenance Processor

H What is the MTU-M 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H MTU-M Standard Features 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H User Interface Types 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 MTU-M Installation Procedures

H Package Checklist 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Installing the MTU-M 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Connecting the Primary Nest to Additional Nests 2-3. . . . . . . . . . . . . . . . . . . .

Expansion Nest Numbering Sequence 2-4. . . . . . . . . . . . . . . . . . . . . . . . .

H Connecting External Alarms 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Initial Setup Instructions

H Accessing the System for the First Time 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . .

H Entering Initial Network Configuration (Netconfig) Parameters 3-2. . . . . . . .

H Entering Initial System Configuration (Sysconfig) Parameters 3-3. . . . . . . . .

H Additional Sysconfig Setup Considerations 3-4. . . . . . . . . . . . . . . . . . . . . . . . .

4 System Terminal Interface

H Connecting a System Terminal 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connecting Your System Terminal Through the MTU-M

Front Panel 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessing the MTU-M Through a Modem 4-3. . . . . . . . . . . . . . . . . . . . . . .

H MTU-M Main Menu 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Menu On/Off Feature 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Contents

5 MTU-M Status and Performance Functions

H Viewing Status from your System Terminal 5-1. . . . . . . . . . . . . . . . . . . . . . . . .

Viewing the General Status of all xTU-Cs 5-2. . . . . . . . . . . . . . . . . . . . . . .

Viewing the Detailed Status of a specific xTU-C 5-4. . . . . . . . . . . . . . . . .

H Accessing Performance Functions 5-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 MTU-M Maintenance Functions

H Accessing MTU-M Maintenance Menu Functions 6-1. . . . . . . . . . . . . . . . . . . .

Viewing the MTU-M Date and Time (date) 6-2. . . . . . . . . . . . . . . . . . . . . .

Changing MTU-M Date and Time (time_set) 6-3. . . . . . . . . . . . . . . . . . . .

Changing MTU-M Operational Parameters (sysconfig) 6-4. . . . . . . . . . .

Changing MTU-M Network Parameters (netconfig) 6-7. . . . . . . . . . . . . . .

Silencing External Alarms (ACO) 6-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clearing MTU-M Alarms and Status Information (clear) 6-10. . . . . . . . . . .

Clearing XTU-C Alarms from the MTU-M (al_clear) 6-11. . . . . . . . . . . . . .

Taking the xTU-C out of the MTU-M Polling Cycle (stoppoll) 6-12. . . . . . .

Placing the xTU-C Back into the MTU-M Polling Cycle (pollstart) 6-12. . .

7 MTU-M Front Panel

H What to Monitor 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H MTU-M Front Panel LEDs 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Alarm Cut Off (ACO) 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Reset 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 MTU-M Alarms

H Overview 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Accessing MTU-M Alarm Functions 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Alarm On/Off Options 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display Alarm Option 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Alarm Definitions 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Major Alarms 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clearing Major Alarms 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Abnormal Alarms 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clearing Abnormal Alarms 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Resetting the MTU-M 8-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Resetting the xTU-C/R 8-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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7900-A2-GB20-00

9 Testing

Contents

H Detecting a Problem 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Understanding Loopbacks 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Accessing Loopback Functions 9-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running a Local Loopback 9-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running a Remote Loopback 9-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H Ending a Loopback 9-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H HDSL T1 Loopback Tests 9-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Local Loopback Test 9-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Loopback Test 9-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H HDSL E1 Loopback Tests 9-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Local Loopback Test 9-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Loopback Test 9-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H SDSL E1 Loopback Tests 9-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Local loopback Test 9-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Loopback Test 9-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H SDSL T1 Loopback Tests 9-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Local loopback Test 9-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Loopback Test 9-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A Cable Pin Assignments

H Terminal Connection Cable Pin Assignments A-1. . . . . . . . . . . . . . . . . . . . . . .

B Netconfig and Sysconfig Menu Values

C SNMP Traps

H SNMP Traps C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

warmStart C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

linkUp and linkDown C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Glossary

Index

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iv

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7900-A2-GB20-00

About This Guide

Document Purpose and Intended Audience

This guide contains information needed to install, configure, and operate the
Hotwire Model 7900 Basic Maintenance Processor (also known as an MTU-M
nest card) for nest-mounted Hotwire 7900 termination units.

It is expected that readers of this document are central office/site (CO) or special
service installation technicians or network engineers who have an understanding
of digital subscriber line systems and High-bit-rate Digital Subscriber Loop
(HDSL) and Symmetric Digital Subscriber Loop (SDSL) transmission systems
plus the deployment of such systems in a telephone company or private network
environment.

Document Summary

Section Description

Chapter 1

Chapter 2

Chapter 3

Chapter 4

Chapter 5

About the Hotwire Model 7900 Basic Maintenance
Processor

7900-F1-500 and typical configurations.

MTU-M Installation Procedures

MTU-M in the Hotwire Model 7900 Nest and connect
multiple adjacent nests.

Initial Setup Instructions

for the MTU-M, including initial IP addressing and system
operational settings.

System Terminal Interface.

connecting a VT100-compatible system terminal to the
MTU-M front panel or nest rear panel. This chapter also
provides procedures to access MTU-M functions through a
modem.

MTU-M Status and Performance Functions.

to monitor the status and performance of nest card
termination units.

. Describes the features of the Model

. Describes how to install the

. Provides initial setup instructions

Provides procedures for

Describes how

7900-A2-GB20-00

March 1998

v

About This Guide

Section Description

Chapter 6

Chapter 7

Chapter 8

Chapter 9

Appendix A

Appendix B

Appendix C

Glossary Defines acronyms and terms used in this document.
Index Lists key terms, acronyms, concepts, and sections in

MTU-M Maintenance Functions.

change MTU-M operational parameters.

MTU-M Front Panel.

termination unit alarms using the MTU-M front panel LEDs.

MTU-M Alarms.

MTU-M alarm functions.

Testing

testing on xTU-C/R pairs.

. Provides procedures for performing loopback

Cable Pin Assignments.

details.

Describes how to monitor nest card

Describes how to access, display, and reset

Contains connector and interface

Standards Compliance for SNMP Traps.

trap information.

Netconfig and Sysconfig Menu Values Table.

table with default MTU-M settings and a column to record
your initial system configuration.

alphabetical order.

Describes how to view and

Contains SNMP

Contains a

Product-Related Documents

Document Number Document Title

7900-A2-GN20

7910-A2-GB20

7914-A2-GB20

7915-A2-GB20

7920-A2-GB20

7924-A2-GB20

7925-A2-GB20

7925-A2-GB22

Contact your sales or service representative to order additional product
documentation.

Hotwire Model 7900 Nest and Options Installation
Guide

Hotwire Model 7914 and 7915 T1 and E1 SDSL Nest
Card Termination Units User’s Guide

Hotwire Model 7914 Standalone T1 SDSL
Termination Unit User’s Guide

Hotwire Model 7915 Standalone E1 SDSL
Termination Unit User’s Guide

Hotwire Models 7924 and 7925 T1 and E1 HDSL
Nest Card Termination Units User’s Guide

Hotwire Model 7924 Standalone T1 HDSL
Termination Unit User’s Guide

Hotwire Model 7925 Standalone E1 HDSL
Termination Unit User’s Guide

Hotwire Model 7925 Standalone T1 HDSL
Termination Unit, G.703 Interface, User’s Guide

Paradyne documents are also available on the World Wide Web at:

http://www.paradyne.com
Select

vi

Service & Support → Technical Manuals

March 1998

7900-A2-GB20-00

About the Hotwire Model 7900
Basic Maintenance Processor

What is the MTU-M

The Hotwiret Model 7900 Basic Maintenance Processor (MTU-M) card is a
processor circuit card assembly (CCA) that mounts into a Hotwire Model 7900
Nest. It is used to monitor the status of the Hotwire Digital Subscriber Line (DSL)
cards and Hotwire Remote Termination Units (RTUs) from either of the following:

1

MTU-M

POWER
FAIL
NMS LINK

MODEMS

ALARMS
MAJOR
MINOR
ABNML

ACO

ACTIVE

RESET

97-15665

H A Network Management System using Simple Network Management

Protocol (SNMP) through the Ethernet port located on the Model 7900 Nest
back panel

H A local asynchronous terminal through the MTU-M’s VT100 serial port

located on the MTU-M front panel

The MTU-M is installed in Slot 1 of the Hotwire Model 7900 Nest and monitors
the performance and status of the following models of nest card termination units
and their associated remote termination units:

Model Number Description

C
O
N
S
O
L
E

7914-B1-xxx SDSL T1 DSX-1
7915-B1-xxx SDSL E1 G.703
7924-B1-xxx HDSL T1 DSX-1
7925-B1-xxx HDSL E1 G.703

The Hotwire Model 7900 19-inch nest holds up to 16 nest-mounted termination
units (15 with the MTU-M installed). A standard 19-inch by 72-inch equipment
rack can house four nests for a total of 64 nest cards.

7900-A2-GB20-00

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1-1

About the Hotwire Model 7900 Basic Maintenance Processor

1

If you have multiple nests, the MTU-M is installed in the top nest (Nest 1) and that
nest is then referred to as the primary nest. Additional expansion nests are
connected to the primary nest through RJ48 connectors located on the nest rear
panel (refer to Chapter 2,

MTU-M Installation Procedures

Nest card termination units are referred to as xTU-C/Rs. The
for HDSL termination units or S for SDSL termination units. The xTUs configured
as central office/site (CO) are referred to as xTU-Cs. The xTU-C’s associated
CP-configured units are referred to a xTU-Rs. The MTU-M monitors only those
xTUs configured as CO. The status of the associated CP-configured unit
nest-mounted or standalone, is monitored through the xTU-C.

The Hotwire Model 7900 Nest and nest card termination units are described in
separate user’s guides. Refer to

Product-Related Documents

for information on other manuals.

MTU-M

POWER
FAIL

MODEMS
ALARMS

NMS LINK

MAJOR
MINOR
ABNML

ACO
ACTIVE

RESET

NETWORK

LOS/AIS/BER

LOCAL
REMOTE
LOOP BK

SYSTEM
PWR
FAIL

C
O
N

LOS / BER

S
O

LOOP 1

L
E

LOOP 2

NETWORK

NETWORK

NETWORK

NETWORK

NETWORK

LOS/AIS/BER

LOS/AIS/BER

LOS/AIS/BER

LOCAL

LOCAL

REMOTE

REMOTE

LOOP BK

LOOP BK

SYSTEM

SYSTEM

PWR

PWR

FAIL

FAIL

HDSL

HDSL

LOS / BER

LOS / BER

LOOP 1

LOOP 1

LOOP 2

LOOP 2

LOS/AIS/BER

LOCAL

LOCAL

REMOTE

REMOTE

LOOP BK

LOOP BK

SYSTEM

SYSTEM

PWR

PWR

FAIL

FAIL

HDSL

HDSL

LOS / BER

LOS / BER

LOOP 1

LOOP 1

LOOP 2

LOOP 2

NETWORK

LOS/AIS/BER

LOS/AIS/BER

LOCAL

LOCAL

REMOTE

REMOTE

LOOP BK

LOOP BK

SYSTEM

SYSTEM

PWR

PWR

FAIL

FAIL

HDSL

HDSL

HDSL

LOS / BER

LOS / BER

LOOP 1

LOOP 1

LOOP 2

LOOP 2

NETWORK

LOS/AIS/BER

LOCAL
REMOTE
LOOP BK

SYSTEM
PWR
FAIL

HDSL

LOS / BER

LOOP 1
LOOP 2

NETWORK

LOS/AIS/BER

LOCAL
REMOTE
LOOP BK

SYSTEM
PWR
FAIL

SDSL

LOS / BER

LOOP

NETWORK

LOS/AIS/BER

LOCAL
REMOTE
LOOP BK

SYSTEM

PWR
FAIL

SDSL

LOS / BER

LOOP

NETWORK

LOS/AIS/BER

LOCAL
REMOTE
LOOP BK

SYSTEM
PWR
FAIL

SDSL

LOS / BER

LOOP

NETWORK

LOS/AIS/BER

LOCAL
REMOTE
LOOP BK

SYSTEM

PWR
FAIL

SDSL

LOS / BER

LOOP

NETWORK

LOS/AIS/BER

LOCAL
REMOTE
LOOP BK

SYSTEM
PWR
FAIL

SDSL

LOS / BER

LOOP

).

x

refers to either H

in

About this Guide

NETWORK

NETWORK

LOS/AIS/BER

LOS/AIS/BER

LOCAL

LOCAL

REMOTE

REMOTE

LOOP BK

LOOP BK

SYSTEM

SYSTEM

PWR

PWR

FAIL

FAIL

SDSL

SDSL

LOS / BER

LOS / BER

LOOP

LOOP

(

xTU-R),

Nest Card

Termination Units (xTU-C/R)

98-15632-0

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March 1998

7900-A2-GB20-00

MTU-M Standard Features

The MTU-M allows you to:

H Monitor and display network and loop performance statistics for up to 79 nest

card termination units and their associated remote termination units (Refer to
Chapter 5,

H Monitor network status remotely from an SNMP manager (Refer to

Chapter 5,

H Monitor system (MTU-M) and network alarms (Refer to Chapter 8,

Alarms

H Perform loopback testing on the nest cards and their associated remote

termination units (Refer to Chapter 9,

H Reset the system (MTU-M) or individual nest card termination units (Refer to

Chapter 8,

H Connect external alarms to the Model 7900 nest (Refer to Chapter 2,

Installation Procedures

MTU-M Status and Performance Functions

MTU-M Status and Performance Functions

)

MTU-M Alarms

About the Hotwire Model 7900 Basic Maintenance Processor

).

)

MTU-M

Testing

)

)

)

MTU-M

User Interface Types

There are three types of user interfaces to the MTU-M card:

H System terminal (refer to Chapter 4,

a menu-driven interface to the MTU-M that allows you to monitor and test
HDSL and SDSL nest card termination units configured as CO. The system
maintenance terminal can be any VT100-compatible terminal.

H MTU-M front panel (refer to Chapter 7,

LEDs and push buttons to allow you to monitor system alarms, reset the
MTU-M and silence external alarms.

H Ethernet Port (10BaseT) – Provides the MTU-M with an interface, through

the Hotwire Model 7900 Nest back panel, to your Network Management
System using SNMP.

System Terminal Interface

MTU-M Front Panel

) – Provides

) – Provides

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About the Hotwire Model 7900 Basic Maintenance Processor

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1-4

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7900-A2-GB20-00

MTU-M Installation Procedures

Package Checklist

Verify that your package contains the following:

- A Hotwire Model 7900 MTU-M

- System terminal cable (9 pin-to-9 pin)

- Warranty card

2

Installing the MTU-M

The procedures in this guide assume that you have already installed the Hotwire
Model 7900 Nest. Installation of the Hotwire Model 7900 Nest and nest card
termination units is described in separate user’s guides. Refer to

Documents

!

HANDLING PRECAUTIONS FOR
STATIC-SENSITIVE DEVICES

This product is designed to protect sensitive components from damage
due to electrostatic discharge (ESD) during normal operation. When
performing installation procedures, however, take proper static control
precautions to prevent damage to equipment. If you are not sure of the

496-15104

proper static control precautions, contact your nearest sales or service
representative.

in

About this Guide

Product-Related

.

7900-A2-GB20-00

March 1998

2-1

MTU-M Installation Procedures

" Pr ocedure

To install the MTU-M:

NOTE:

A maximum of four Hotwire Model 7900 nests can be installed into one
standard 72-inch equipment rack. If more than one nest is installed in the
same equipment rack, install the MTU-M in slot 1 of the top nest. The nest
containing the MTU-M is referred to as the primary nest.

1. Remove the MTU-M from any protective packaging.

2. Align the circuit board with the top and bottom card guides of Slot 1.

MTU-M Slot 1

OK
FAIL

SELECT

NETWORK

LOS/AIS/BER

NEXT

LOCAL
REMOTE
REMOTE
LOOP BK

ALARMS
MAJOR

SYSTEM

MINOR

POWER

ABNORM

FAIL

ACO

ACTIVE

SDSL

LOS / BER

LOOP

MODEMS
ALARMS

MTU-M

POWER
FAIL
NMS LINK

MAJOR
MINOR
ABNML

ACO
ACTIVE

RESET

C
O
N
S
O
L
E

97-15598

3. Slide the MTU-M into the slot until the backplane connector plug is seated
firmly into the backplane.

4. Tighten the retaining screws at the top and bottom of the MTU-M front panel.

2-2

March 1998

7900-A2-GB20-00

Connecting the Primary Nest to Additional Nests

Connections between nests are only made from the primary nest (Nest 1) to each
expansion nest (Nests 2, 3, and 4). Connecting the primary nest to an expansion
nest allows the MTU-M to monitor the nest card termination units in Nests 2, 3,
and 4.

" Procedure

To connect the primary nest to each expansion nest:

1. Connect the primary nest and Nest 2 by connecting the nest expansion cable
between J28 (TO 2) on the primary nest to J26 (FROM 1) on Nest 2.

2. Connect the primary nest and Nest 3 by connecting the nest expansion cable
between J29 (TO 3) on the primary nest to J26 (FROM 1) on Nest 3.

3. Connect the primary nest and Nest 4 by connecting the nest expansion cable
between J27 (TO 4) on the primary nest to J26 (FROM 1) on Nest 4.

MTU-M Installation Procedures

Nest 2

POWER

Bgnd

–48vB

Agnd

–48vA

–48vB

Agnd

–48vA

POWER

TO 4

J27

TO 2

J28

TO 3

J29

FROM 1

J26

J27

J28

J29

J26

Nest 1

(Primary)

P6

Local Loop

TO 4

TO 2

TO 3

FROM 1

TO 4

POWER

Bgnd

P5

Alarms

RS232
Modem

10BaseT

DB25

AUI
Network
Management

DB15

–48vB

Agnd

–48vA

J27

TO 2

J28

TO 3

J29

FROM 1

J26

Nest 3

TO 4

J27

POWER

Bgnd

–48vB

Agnd

–48vA

TO 2

J28

TO 3

J29

FROM 1

J26

Nest 4

TO 4
POWER
Bgnd

–48vB

Agnd

–48vA

J27

TO 2

J28

TO 3

J29

FROM 1

J26

7900-A2-GB20-00

March 1998

97-15414

2-3

MTU-M Installation Procedures

Expansion Nest Numbering Sequence

A fully populated equipment rack with four 19-inch Hotwire Model 7900 nests and
one MTU-M holds 63 nest card termination units. There are 15 nest card
termination units in the first nest (primary nest with MTU-M installed) and 16 in
each adjacent nest. Nest card termination units are numbered from left to right
(from the front of the nest) as follows:

In Nest . . .

1 (primary) 2–16
2 21–36
3 41–56
4 61–76

NOTE:

MTU-M menus allow you to select xTU IDs from 2–80. This number reflects a
potential 23-inch nest option. Each 23-inch nest would hold up to 20 nest
card termination units. A fully populated equipment rack (with four 23-inch
nests) could contain up to 80 nest cards (a single MTU-M and 79 termination
units).

Connecting External Alarms

The MTU-M provides dry alarm contacts that allow you to connect external
alarms to the nest rear panel at J21. The Alarm contacts are energized by the
MTU-M upon detection of an alarm condition. Each alarm relay, when closed,
connects your alarm power to your common to complete your Major and
Abnormal alarm circuits. The Minor alarm relay is not currently supported.

" Procedure

Nest Cards are Numbered . . .

2-4

To connect your external alarms to the rear panel alarm terminal (J21):

1. Connect alarm ground to the terminal labeled COM.

Alarms

MAJ

MIN

ABNM

P6

TO 4

J27

POWER

TO 2

Bgnd

J28

48vB

Agnd

TO 3

48vA

J29

FROM 1

J26

P5

Alarms

RS232
Modem

10BaseT

DB25

AUI
Network
Management

DB15

P7

Local Loop

COM

J21

97-15654

2. Connect your abnormal alarm circuit to the terminal labeled ABNM.

3. Connect your major alarm circuit to the terminal labeled MAJ.

March 1998

7900-A2-GB20-00

Initial Setup Instructions

Accessing the System for the First Time

When you install the MTU-M for the first time you must enter network
configuration and system operational parameters for the MTU-M. This chapter
provides the setup procedures needed to initially configure the MTU-M.

NOTE:

MTU-M initial setup procedures must be performed locally from a VT100
connected through the DB9 Console port on the MTU-M front panel.

3

7900-A2-GB20-00

March 1998

3-1

Initial Setup Instructions

Entering Initial Network Configuration (Netconfig)
Parameters

The recommended order for entering network configuration parameters is:

H MTU-M IP address
H Subnet Mask
H Default Gateway
H SNMP Manager Address
H Default Gateway Address
H System Name, Contact, and Location

NOTE:

The default values are recorded in Appendix B,

Menu Values

write the values down in the table provided in Appendix B for future
reference. Default values have ben provided.

. When changing network configuration values, it is helpful to

Netconfig and Sysconfig

" Procedure

To enter initial network configuration parameters information:

1. At the MTU-M–> prompt, type m.
The Maintenance menu displays.

2. At the maint–> prompt, type net.
The Netconfig menu displays. This screen contains the current network

management information.

3. At the netconfig–> prompt, press Enter.
A prompt appears asking you if you wish to change the current values.

4. Type y at the yes/no prompt and press Enter.
The system displays the default settings.

5. Type new at the password prompt. You can change your password from the
Network Parameters menu.

The changes you make at the Netconfig menu are stored in a working buffer.
If you make an error or are unsure of your changes, do not save your
changes. The system will return to the previous values.

6. Change Netconfig menu option values as required. Refer to

MTU-M Network Parameters (netconfig)

Functions

.

in Chapter 6,

Changing

MTU-M Maintenance

7. Type q to exit the Netconfig menu.

8. At the yes/no prompt, type

3-2

March 1998

y and press Enter to save your changes.

7900-A2-GB20-00

Entering Initial System Configuration (Sysconfig)
Parameters

Use the following procedure to set your initial system configuration parameters
from the System Terminal.

NOTE:

Default values are recorded in Appendix B,

Values

current values down in the table provided in Appendix B.

. When changing network configurations, it is helpful to first write the

" Pr ocedur e

To enter initial system configuration parameters:

1. At the MTU-M–> prompt, type m.
The Maintenance menu displays.

2. At the maint–> prompt, type sys.
The Sysconfig menu displays. This screen contains the current system

configuration parameters.

Netconfig and Sysconfig Menu

Initial Setup Instructions

3. At the sysconfig–> prompt, press Enter.
A prompt appears asking you if you wish to change the current values.

4. Type y at the yes/no prompt and press Enter.
The system displays the default settings.

5. Type new
Netcofig menu.

The changes you make at the Sysconfig menu are stored in a working buffer.
If you make an error or are unsure of your changes, do not save your
changes. The system will return to the previous values.

6. Change Sysconfig values as required. Refer to

Parameters (sysconfig)

at the password prompt. You can change your password from the

Changing MTU-M Operational

in Chapter 6,

MTU-M Maintenance Functions

NOTE:

When setting system configuration parameters, refer to

Setup Considerations

Polling Interval and Pollto options.

7. Type q to exit the Sysconfig menu.

8. Type y at the yes/no prompt and press Enter to save your changes.

on page 3-4 for an example of how to configure the

Additional Sysconfig

.

7900-A2-GB20-00

March 1998

3-3

Initial Setup Instructions

Additional Sysconfig Setup Considerations

Depending on the number of nest cards you have, you may need to adjust the
Polling Range, Polling Interval, and Pollto options on the Sysconfig menu:

H Polling Range – Defines the range of nest cards that the MTU-M will poll.

Adjust the polling range to match the number of total nest cards in your
system starting with slot 2.

H Polling Interval – Denotes the time the MTU-M waits between successive

starts of the polling cycle. If all of the nest cards can not be polled in this
amount of time they may be skipped.

H Pollto – Denotes the maximum amount of time, in 256th seconds, that the

MTU-M will wait between the polling of each line card.

For example, if you have 51 nest cards:

1. Set your polling range from 2–51 (slot 1 is the MTU-M).

2. Set initial Pollto to 50/256th seconds (.195 seconds).

3. Set Polling Interval to10 (51 nest cards * .195 seconds = 9.945)
If you find that all of your nest cards are not being polled, you may need to

adjust these values.

3-4

March 1998

7900-A2-GB20-00

System Terminal Interface

Connecting a System Terminal

You can connect a system terminal directly or through a modem to the MTU-M
front panel. The system terminal must be a VT100-compatible terminal or a PC
running emulation software.

The system terminal provides a menu-driven interface to the MTU-M card that
allows you to:

H Monitor the status of HDSL and SDSL nest card termination units (xTUs)

configured as central site/office (CO)

(

xTU-Cs)

4

H Monitor the status of associated customer premises (CP) termination units

(xTU-R)

H Perform loopback testing on xTU-C/R pairs
H Change MTU-M operational and network parameters
H Reset the unit

NOTE:

The MTU-M monitors only those nest card termination units configured as
central office/site (CO) (xTU-C). The status of an xTU-C’s associated CP
configured unit (xTU-R) is monitored through the

xTU-C.

7900-A2-GB20-00

March 1998

4-1

System Terminal Interface

Connecting Your System Terminal Through the MTU-M Front Panel

Procedure

"

To connect your system terminal to the 9-pin connector on the MTU-M front
panel:

1. Connect the terminal cable (included) into a COM port on your system
terminal.

MTU-M

POWER
FAIL
NMS LINK

NETWORK
LOS/AIS/BER

MODEMS
ALARMS

LOCAL

MAJOR

REMOTE

MINOR

LOOP BK

ABNML

SYSTEM
POWER

ACO

FAIL

ACTIVE

RESET

C

HDSL

O
N

LOS / BER

S

LOOP A

O
L

LOOP B

E

DB9

(Cable Provided)

DB9

System T erminal

97-15658

2. Plug the other end into the 9-pin jack on the MTU-M front panel.
If your PC requires a 25-pin connector to the COM port, see Appendix A,

Cable Pin Assignments

, for the correct cable pinouts.

3. Set your terminal parameters as follows:

— 9600 baud
— 8 bit
— no parity
— 1 stop bit
— no flow control

4. Press Enter to activate the MTU-M Main Menu.
The MTU-M performs a series of diagnostic tests and reports the status of

each xTU-C to the system terminal upon initialization. After a few moments,
the MTU-M Main Menu appears on your terminal. MTU-M menus are
described in detail in Chapters 5–8.

4-2

March 1998

7900-A2-GB20-00

Accessing the MTU-M Through a Modem

You can access the MTU-M through a modem using the DB9 connector on the
MTU-M front panel.

" Procedure

To connect your system terminal to the MTU-M through a modem using the
MTU-M front panel DB9 connector:

1. Connect one end of the cable (supplied) to the MTU-M front panel.

2. Connect the other end of the cable to the modem using one of the following
methods:

— The DB9 to DB25 connection can be made using the terminal cable

supplied with the MTU-M and the following standard cable accessories:

79xx

MTU-M

POWER
FAIL
NMS LINK

NETWORK

LOS/AIS/BER

MODEMS
ALARMS

LOCAL

MAJOR

REMOTE

MINOR

LOOP BK

ABNML

SYSTEM
POWER

ACO

FAIL

ACTIVE

RESET

C

HDSL

O
N

LOS / BER

S

LOOP A

O

L

LOOP B

E

DB9

DB9F

DB9F/DB25M

System Terminal Interface

Modem

79xx

Terminal

Cable

Terminal

Cable

DB9 M/M

Gender

Changer

Gender

Change

DB9 DB9F DB9 M/M DB9F DB25M DB25F DB25M

RXD

3333223

TXD

2222332

Gnd

5555777

— Or you can customize a cable as follows:

79xx

MTU-M

POWER
FAIL
NMS LINK

NETWORK
LOS/AIS/BER

MODEMS
ALARMS

LOCAL

MAJOR

REMOTE

MINOR

LOOP BK

ABNML

SYSTEM

POWER

ACO

FAIL

ACTIVE

RESET

C

HDSL

O
N

LOS / BER

S

LOOP A

O
L

LOOP B

E

TXD 2

DB9

Pin # Pin #

RXD 3

Gnd 5

DB25F/DB25M

Null Modem

Adapter or Cable

DB9/DB25 Null Modem

DB25M

3 RXD
2 TXD
7 Gnd

RXD
TXD
Gnd

97-15634

Modem

97-15635

7900-A2-GB20-00

March 1998

4-3

System Terminal Interface

3. Set your modem parameters as follows:

— 9600 baud
— 8 bit
— no parity
— 1 stop bit
— disable or suppress result codes

MTU-M Main Menu

The MTU-M automatically boots up upon power up or MTU-M reset and displays
a series of status messages as the MTU-M polls and receives information from
each xTU-C. After polling of the primary nest (Nest 1) is complete, the MTU-M
Main Menu appears. The polling of secondary nests (Nest 2, 3, and 4) continues
after the Main Menu appears.

Commands can be entered as complete words (status, alarm on, alarm off) or
can be abbreviated to the minimum number of characters that uniquely identify it
from other options. In most cases typing the first one or two characters of the
command is sufficient (for example, s for status).

NOTE:

Throughout this document the menu path taken to access the screen is
provided at the top of each screen sample.

The MTU-M Main Menu screen appears as follows:

Menu path: Main

MTU-M Maintenance Processor Main Menu
Select Command:

COMMAND DESCRIPTION

Status – Display System xTU–C/R status
Performance – Display xTU–C/R line statistics
LoopBack – Perform LoopBack Function
Reset – Reset Command for xTU–C/R’s
Alarms – MTU–M alarms log functions
Maintenance – MTU–M maintenance functions
Version – MTU–M firmware version, serial number

MTU–M –>

4-4

March 1998

7900-A2-GB20-00

Menu On/Off Feature

System Terminal Interface

The MTU-M displays a list of options for each menu level. Once you have
become familiar with these menu options you can use the Menu Off command to
suppress these menu options.

To suppress menu options, type menu off at any MTU-M prompt and press
Enter. Only MTU-M prompts are displayed. The current menu can be displayed at
any time by typing ? at any MTU-M prompt.

To restore menu options, type menu on at any MTU-M prompt and press Enter.
Menu option are restored to the terminal.

The Menu On/Off feature default setting can be set to on or off using the
Sysconfig option from the Maintenance menu.

7900-A2-GB20-00

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4-5

System Terminal Interface

This page intentionally left blank.

4-6

March 1998

7900-A2-GB20-00

MTU-M Status and Performance
Functions

Viewing Status from your System Terminal

The MTU-M allows you to monitor the general alarm, polling, and circuit status of
all xTU-Cs or view the detailed status of a specific xTU-C. The status of the
associated xTU-R is monitored through the

To access the MTU-M Status menu from the MTU-M Main menu, type s at the
MTU-M –> prompt and press Enter. The following menu appears:

xTU-C.

5

Menu path: Main → Status

Select Command:

COMMAND DESCRIPTION

all – enter ALL to select all valid xtu’s
<2-80> – enter xtu id <2-80>

– Current polling range: (2 to 76)

Quit – Quit Command

For status, enter xtu id or ALL

:

7900-A2-GB20-00

March 1998

5-1

MTU-M Status and Performance Functions

The following table provides a description of the Status menu options:

Option

all Displays Alarm, Polling, and Circuit status for all xTUs configured as CO.
<2—80> Displays detailed status information for the selected xTU-C/R pair. If no

Quit Takes you back to the MTU-M Main Menu.

Function

remote unit is connected, only status for the CO side is displayed.

Viewing the General Status of all xTU-Cs

To access the status of all xTU-Cs, type a at the Status –> prompt and press
Enter. A table containing Alarm, Polling, and Circuit status information for all
xTU-Cs appears as follows:

Menu path: Main → Status → all

xTU-C/R | 3 7 9 12
DSL Type | HTU HTU STU STU
ALARM | * * *
POLL | INS INS OOS MOS
CIRCUIT | OOS INS --- ---

|

System Status

5-2

Hit return to continue ...

March 1998

7900-A2-GB20-00

MTU-M Status and Performance Functions

The following table provides a description of the System Status screen:

Status

DSL type Indicates the type of card, HTU (HDSL Termination Unit), STU (SDSL

Alarm The position of the asterisk within the field indicates the alarm status of

Poll Indicates the communications status between the MTU-M and xTU-C.

Circuit Indicates the communications status between the xTU-C/R pair.

Function

Termination Unit), or xTU (unknown card type).

each xTU-C.
* – Major alarm (far left)

* – Minor Alarm (middle, not used at this time)
* – Abnormal alarm (far right)

The System Status screen example indicates a Major alarm at
HTU-C/R 3 and a Major and Abnormal alarm at STU-C/R 9.

INS – In service. The

Polling rate is selectable from the Maintenance menu.

OOS – Out of service. The

and is currently out of service.

MOS – Maintenance out of service. The xTU-C/R has been

manually taken out of the MTU-M polling cycle.

The System Status screen example indicates that STU-C/R 9 is OOS
and STU-C/R 12 was placed in MOS.

INS – In service. The xTU-C is in service.
OOS – Out of service. The xTU-C/R pair is not communicating with

the MTU-M.

- - - - – xTU-C is in MOS or OOS. The xTU-C has been manually
taken out of the MTU-M polling loop and is not being monitored.

The System Status screen example indicates that HTU-C/R 3 circuit
status is OOS.

xTU-C is currently in the MTU-M polling cycle.

xTU-C/R was previously detected

7900-A2-GB20-00

March 1998

5-3

MTU-M Status and Performance Functions

Viewing the Detailed Status of a specific xTU-C

To access the status of an individual termination unit configured as CO, type the
ID number of the termination unit at the For status, enter xtu id or ALL: prompt
and press Enter. The status of the selected termination unit appears as follows:

Menu path: Main → Status → (2-80) (Screen 1 of 2)

Status Of HDSL Circuit #3

Major alarm ......... OFF

Minor alarm ......... OFF

Abnormal condition... OFF

______________________________

MTU-M poll state ..... In service In service

Circuit state Loop A . In service In service
Circuit state Loop B . In service In service
Network input signal . In service N/A

DTR Signal ........... Active

DSR Signal ........... Active

S/N Ratio Loop A .... 42.0 dB 43.0 dB

S/N Ratio Loop B ..... 42.5 dB 43.5 dB

Hit return to continue ...

HTU–C___________ HTU-R_____

The following table provides definitions of the fields contained on Screen 1 of the
Circuit Status screen:

Status

MTU-M poll state Indicates the MTU-M Polling status of the xTU-C/R pair

Function

selected.

H In service
H Out of service
H Poll MOS (maintenance out of service)

Circuit state Loop A Indicates the communications status of Loop A.

Circuit state Loop B
(HDSL only)

5-4

H In service
H Out of service
H N/A

Indicates the communications status of Loop B (HDSL only).

H In service
H Out of service
H N/A

March 1998

7900-A2-GB20-00

MTU-M Status and Performance Functions

Status Function

Network input signal Indicates the status of the network input signal.

H In service
H Out of service
H N/A

DTR Signal
(V.35 CP units only)

DSR Signal
(V.35 CP units only)

S/N Ratio Loop A Displays the signal-to-noise ratio of Loop A.
S/N Ratio Loop B

(HDSL only)

Indicates the Data Terminal is ready to transmit and receive
data.

Indicates the Data Set is ready to transmit and receive data.

Displays the signal-to-noise ratio of Loop B.

Press Enter to view the remaining status of the termination unit.

Menu path: Main → Status → (2-80) (Screen 2 of 2)

Status of xDSL Circuit #3

__________________________
Card type xDSL E1/G703 xDSL E1/V.35
Loop Mode Loops A & B Loops A & B
Loopback OFF OFF
Line encoding B8ZS B8ZS
Line build out 0 to 133 feet 0 to 133 feet
Frame type D4
Starting time slot 1
V.35 Payload Rate 1984 Kbps (31x64)
V.35 Transmit Timing Loop
DSP software revision 1.17 1.17
DSL software revision 6.0 7.0
DSL software checksum 737e 837e
card serial # 87464 85565

xTU–C______________ xTU-R_____

Hit Return to continue ...

7900-A2-GB20-00

March 1998

5-5

MTU-M Status and Performance Functions

The following table provides definitions of the fields contained on Screen 2 of the
Circuit Status screen:

Option

Function

Card type Identifies xTU-C and xTU-R type.

H HDSL E1/T1
H SDSL E1/T1

Loop Mode
(HDSL only)

Identifies which loop or loops are in use.

H Loop A
H Loop B
H Loops A & B

Loopback Indicates loopback testing status.

H On
H Off

Line encoding Identifies type of line encoding currently in use.

H HDB3
H B8ZS
H AMI

Line build out Indicates the current line build out for the xTU-C/R pair.

For G.703-compatible units:

H 120 ohm
H 75 ohm

For DSX-1-compatible units:

H 0 to 133 feet
H 133 to 266 feet
H 266 to 399 feet
H 399 to 533 feet
H 533 to 655 feet

Frame type Indicates type of framing in use by the xTU-C/R pair.

H Framed
H ESF
H D4
H Unframed

Starting time slot Specifies the starting tine slot for a V.35 to DSX-1 or V.35

to G.703 configuration.

V.35 Payload Rate Specifies the V.35 CP payload rate (64 through

1536 kbps).

V.35 Transmit Timing Indicates where the xTU-R timing source (V.35 CP units

only).
DSP Software revision Displays the DSP software revision of the xTU-C/R pair.
DSL Software revision Displays the DSL software revision of the xTU-C/R pair.
DSL Software checksum Displays the DSL software checksum for the xTU-C/R

pair.
Card serial # Displays the serial numbers of the xTU-C/R pair.

5-6

March 1998

7900-A2-GB20-00

Accessing Performance Functions

MTU-M performance functions allow you to view current and past performance
information for an individual xTU-C. Performance functions can only be accessed
from a system terminal.

NOTE:

Performance statistics are files of data accumulated and stored by the
MTU-M for each nest card termination unit. Swapping or removing nest card
termination units does not clear the data stored in these files within the
MTU-M. It is recommended that you clear performance statistics as soon as
possible after replacing or removing an
data.

" Procedure

To access the MTU-M Performance functions:

1. Type p at the MTU-M –> prompt and press Enter.

A menu displays allowing you to select an xTU-C.

MTU-M Status and Performance Functions

xTU-C to avoid displaying incorrect

2. Enter an xTU-C ID and press Enter.

The following menu displays:

Menu path: Main → Performance → xDSL circuit # (2-80)

Select Time Period Menu

Select Command:

COMMAND DESCRIPTION
A – Prev 1 min – Select previous 1 minute time period
B – Curr 15 min – Select current 15 minute time period
C – Prev 15 min – Select previous 15 minute time period
D – Curr 1 hr – Select current 1 hour time period
E – Prev 1 hr – Select previous 1 hour time period
F – Curr 12 hr – Select current 12 hour time period
G – Prev 12 hr – Select previous 12 hour time period
I – Curr 24 hr – Select current 24 hour time period
J – Prev 24 hr – Select previous 24 hour time period
K – Curr 7 day – Select current 7 day time period
L – Prev 7 day – Select previous 7 day time period
M – Clear – Clear Performance Stats for All Time Periods
Quit – Quit Command

Select time period->

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5-7

MTU-M Status and Performance Functions

3. Enter a time interval and press Enter.

The requested performance data appears.
Performance statistic data is stored in intervals of 1 minute, 15 minutes,

1 hour, 12 hours, 24 hours, and 7 days. Choosing a previous interval allows
you to view the last complete time interval. Selecting a current interval allows
you to view the most current time interval. Current intervals may not contain a
complete time cycle.

For example, if you type e (prev 1 hr) at the Select time period –> prompt,
the last full hour of data captured is displayed. Typing f (Curr 1 hr) displays
from 1–59 minutes of the most current data.

NOTE:

If you take the xTU-C out of the MTU-M polling cycle (stoppoll from the
Maintenance Menu), performance data is no longer collected by the MTU-M.
You can view the most recently collected data by selecting a current time
period (options B, D, F, I, and K) that is greater than the amount of time the
xTU-C has been out of service.

Menu path: Main → Performance → xDSL circuit # (2-80) → time interval

The STU Line Error Statistics Table for STU #7 for the previous 15
minutes
CO: SDSL E1/G.703 CP: SDSL E1/G.703

CV FAS BPV
HTU-C Network
Input 14 0 0
Signal

HTU-R Network
Input 0 0 0
Signal

FAW A FEBE A CRC A
HTU-C
HDSL 2 46 16
Circuit

HTU-R
HDSL 2 33 34
Circuit
Hit return to continue ...

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March 1998

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MTU-M Status and Performance Functions

The following table provides definitions of the fields contained in the Line Error
Statistics table:

Field

CV
(E1 only)

MOS
(T1 only)

FAS (D4 framing
only)

CRC (ESF
framing only)

BPV Bipolar Violation – Indicates the number of bipolar errors detected

FAW A Frame Alignment Word (Loop A) – Indicates the number of times

FEBE A Far End Bit Error (Loop A) – Indicates the number of errors

CRC A Cyclic Redundancy Check (Loop A) – Indicates the number of

FAW B
(HDSL only)

Contains

Code Violation – Displays the number of code violations detected
within the specified time period.

Multi-frame Out of Sync – Indicates the number of multiframes
received out of synchronization within the specified time period.

Frame Alignment Signal – Indicates the number of times a loss of
signal (LOS) error was detected within the specified time period.

Cyclic Redundancy Check – Indicates the number of network CRC
errors detected within the specified time period.

within the specified time period.

a loss of synchronization error was detected in Loop A within the
specified time period.

reported by the remote equipment for Loop A.

CRC errors detected on Loop A.
Frame Alignment Word (Loop B) – Indicates the number of times

a loss of synchronization error was detected within the specified
time period in Loop B.

FEBE B
(HDSL only)

CRC B
(HDSL only)

Far End Bit Error (Loop B) – Indicates the number of errors
reported by the remote equipment for Loop B.

Cyclic Redundancy Check (Loop B) – Indicates the number of
CRC errors detected on Loop B.

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5-9

MTU-M Status and Performance Functions

This page intentionally left blank.

5-10

March 1998

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MTU-M Maintenance Functions

Accessing MTU-M Maintenance Menu Functions

MTU-M Maintenance functions allow you to:

H Set and view the MTU-M date and time
H Change MTU-M system configuration parameters
H Change MTU-M network configuration parameters
H Start, stop, and control cycle time of MTU-M status polling
H Clear MTU-M alarm and status registers

6

To access the MTU-M Maintenance functions from the MTU-M Main Menu,
type m at the MTU-M –> prompt. The Maintenance menu appears as follows:

Menu path: Main → Maintenance

Maintenance Menu
Select Command:

COMMAND DESCRIPTION

time_set – set date and time – yy/mm/dd hh:mm:ss [am/pm]
date – show date and time
sysconfig – Display/modify MTU–M system configuration parameters
netconfig – Display/modify MTU–M network configuration parameters
aco – turn on ACO alarm cut off
clear – clear xtu’s alarm and status info
al_clear – clear xtu’s alarms
stoppoll – Set status to polling maintenance out of service
pollstart – Resume polling
Quit – Quit Command

maint –>

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6-1

MTU-M Maintenance Functions

The following table provides a description of the Maintenance menu options:

Command

time_set Allows you to set the MTU-M time and date. The time and date are used

date Displays current MTU-M time and date.
sysconfig Displays current operating parameter settings and provides a menu for

netconfig Displays current network parameter settings and provides a menu for

aco Toggles the alarm cutof f relay on and off.
clear Clears all information about a specified xTU from the MTU-M’s status and

al_clear Clears the current alarm from the MTU-M. This command does not clear

stoppoll Stops the MTU-M from polling a specified xTU-C. The operation of the

pollstart Resumes polling of a specified xTU by the MTU-M.
Quit Returns you to the MTU-M Main Menu.

Function

for alarm logging.

changing the MTU-M operating parameters.

changing the MTU-M network configuration.

alarm logs. This command is useful when an xTU has been removed
from the nest.

historical performance data.

xTU is not affected; stoppoll only suspends communication between the
MTU-M and the specified xTU.

Viewing the MTU-M Date and Time (date)

Procedure

"

To view the current MTU-M date and time:

1. From the Maintenance menu, type d at the maint –> prompt and press Enter.
The current date and time are displayed.

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7900-A2-GB20-00

Changing MTU-M Date and Time (time_set)

Procedure

"

To change the MTU-M date or time:

1. From the Maintenance Menu, type t at the maint –> prompt and press Enter.

2. Enter the new date and time in the format shown and press Enter.

Menu path: Main → Maintenance → time_set

Maintenance Menu
Select Command:

COMMAND DESCRIPTION

time_set – set date and time – yy/mm/dd hh:mm:ss [am/pm]
date – show date and time
sysconfig – Display/modify MTU–M system config parameters
netconfig – Display/modify MTU–M network config parameters
aco – turn on ACO alarm cut off
clear – clear xtu’s status & alarm
al_clear – clear xtu’s alarms
stoppoll – Set status to polling maintenance out of service
pollstart – Resume polling
Help or ? – Command Help
Quit – Quit Command

MTU-M Maintenance Functions

maint –>t

yy/mm/dd hh:mm:ss [am/pm]

Time:

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6-3

MTU-M Maintenance Functions

Changing MTU-M Operational Parameters (sysconfig)

The sysconfig option on the Maintenance menu is used to display and change
several parameters that affect MTU-M operation. Type sys at the maint –>
prompt, to display the Operating Parameters screen (values displayed depend on
your current configuration):

NOTE:

If in the course of making changes you want to start over with the current
settings, use the read option. This resets the operations parameters back to
their current values.

Changes to MTU-M operational parameters do not take effect until you Quit the
MTU-M Operations Parameters menu and save your changes.

Menu path: Main → Maintenance → sysconfig

MTU–M Operations Parameters

EEPROM values are: VALID
Polling Range: 2 – 16
Polling interval: 10 seconds
Poll time-out on 256th’s second 30
Initial alarm on/off setting: ON
Initial menu on/off setting: ON
Console port baud rate: 9600 baud

Hit return to continue

Would you like to modify values? [Y/N]:: Y
You must enter password to modify values: ***

The following values have been copied to a work buffer and
individual changes will be made to the variables in the work buffer.
When finished with changes, enter <quit>
and you will be asked if you want the changes saved.

Hit return to continue

...

...

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MTU-M Maintenance Functions

The following table provides a description of the operations parameters:

Field

EEPROM values are Displays the current status of the xTU-C EEPROM values.
Polling Range Displays the maximum and minimum xTU-C polling address.

Polling interval Indicates the amount of time the MTU-M waits between

Polling time-out Denotes the maximum amount of time, in 256th seconds,

Initial alarm on/off
setting

Initial menu on/off
setting

Console port baud rate Indicates the baud rate for the system terminal.

Function

The maximum possible xTU-C address is the right-most card
in the lowest nest. Refer to

Sequence

the xTU numbering sequence.

successive starts of the polling cycle. If all of the nest cards
can not be polled in this amount of time they may be
skipped.

that the MTU-M will wait between the polling of each line
card.

Indicates whether or not alarms are automatically displayed
on the system terminal as they occur.

Indicates whether or not menus are displayed on the system
terminal.

, in Chapter 2,

Expansion Nest Numbering

MTU-M Installation Procedures

, for

Menu path: Main → Maintenance → sysconfig (Enter)

MTU–M Operations Parameters Menu

Select Command:

COMMAND DESCRIPTION

max xtu – set the maximum xtu polling address
min xtu – set the minimum xtu polling address
polling interval – set active circuit polling time interval
pollto – set polling time-out length
alarm – change initial alarm on/off setting
menu – change initial menu on/off setting
console – set console port baud rate
read – re–read the EEPROM
Quit – Quit Command

op param–>

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6-5

MTU-M Maintenance Functions

The following table provides a description of the Operations Parameters Menu.

maxhtu

Valid Values: 2 to 80
Default Setting: 80

Sets the maximum xTU polling address. xTU addressing counts the number of slots in
the nests, from left to right, top to bottom. The maximum possible xTU address is the
right-most card in the lowest nest. Refer to
Chapter 2,

minhtu

V alid Values: 2 to 80
Default Setting: 2

Sets the minimum xTU polling address. Refer to the addressing scheme described for
maxhtu above. Since the MTU-M takes up the first slot in Nest 1 (primary), the xTU next
to the MTU-M is address #2. Refer to
Chapter 2,

polling interval

V alid Values: 0 to 255 seconds
Default Setting: 10

Indicates the amount of time the MTU-M waits between successive starts of the polling
cycle. If all of the nest cards can not be polled in this amount of time they may be
skipped.

MTU-M Installation Procedure

Expansion Nest Numbering Sequence

MT u-M Installation Procedure

Expansion Nest Numbering Sequence

, for the multiple nest numbering sequence.

, for the multiple nest numbering sequence.

in

in

pollto

V alid Values: 0 to 256 in 256th seconds
Default Setting: 30

Determines polling cycle time for the nonactive circuits in the nest. Nonactive circuits
are those termination units for which a “stoppoll” command has been issued.

alarm

V alid Values: ON, OFF
Default Setting: ON

Determines at time of initial boot-up whether or not alarms are automatically displayed
on the system terminal as they occur.

menu

V alid Values: ON, OFF
Default Setting: ON

Determines at time of initial boot-up whether or not menus are displayed on the system
terminal.

console

V alid Values: 75, 100, 134.5, 150, 300, 600, 1200, 1800, 2000, 2400, 4800,
Default Setting: 9600

Sets the baud rate for the system terminal.

9600, or 19200

6-6

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7900-A2-GB20-00

Changing MTU-M Network Parameters (netconfig)

The Netconfig option on the Maintenance menu is used to display and change
network parameters that affect MTU-M. Type net at the maint –> prompt, to
display the Network Configuration Menu screen (values displayed depend on
your current network configuration):

Changes to MTU-M Network parameters do not take effect until you Quit the
MTU-M Operations Parameters menu and save your changes.

Menu path: Main → Maintenance → netconfig (Screen 1 of 3)

maint–>net

MTU–M Network Parameters

-Mac Address : 000.000.000.000
1 -My IP Address : 000.000.000.000
2 -Subnet Mask : 255.255.255.0
3 -Default Gateway : 255.255.255.255
4 -SNMP Manager Address : 000.000.000.000
5 -Default Gateway Address : 255.255.255.169
6 -System Contact : System Contact – Who
7 -System Name : System Name – What (MTUM)
8 -System Location : System Location — Where

MTU-M Maintenance Functions

Hit return to continue

...

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6-7

MTU-M Maintenance Functions

The following table provides a description of the network management options:

Field

IP Address Contains the IP address of the MTU-M card itself.
Subnet Mask Contains the Subnet Mask of the MTU-M card.
SNMP Manager

Address
Default Gateway

Address
Broadcast Address Indicates whether or not alarms are automatically displayed

System Contact Allows you to enter up to 128 ASCII characters. This field is

System Name Allows you to enter up to 128 ASCII characters. This field is

System Location Allows you to enter up to 128 ASCII characters. This field is

Change Password Allows you to change your MTU-M password. The default

Function

Contains the IP Address of your SNMP Manager.

Contains the address of the gateway that is to be used to reach
hosts that are not on the same subnet as the MTU-M.

on the system terminal as they occur.

for informational purposes only .

for informational purposes only .

for informational purposes only .

password is

new.

Menu path: Main → Maintenance → netconfig (Screen 2 of 3)

Would you like to modify values? [Y/N]:: Y
You must enter password to modify values: new

The following values have been copied to a work buffer and
individual changes will be made to the variables in the work buffer.
When finished with changes, enter <quit>
and you will be asked if you want the changes saved.

Hit return to continue

...

6-8

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7900-A2-GB20-00

MTU-M Maintenance Functions

Menu path: Main → Maintenance → Netconfig (Screen 3 of 3)

maint–>net

MTU–M Network Parameters

COMMAND

-Mac Address - set ip address
1 -My IP Address - set subnet mask
2 -Subnet Mask - set snmp manager address
3 -SNMP Manager Address - set default gateway address
4 -Default Gateway - set broadcast address
5 -Broadcast Address - set broadcast address
6 -System Contact - set name of contact
7 -System Name - set node’s fully qualified domain
8 -System Location - set the physical location of mtu
9-Change Password - Change the administrator password

Hit return to continue

Silencing External Alarms (ACO)

The Alarm Cut Off (ACO) option on the Maintenance menu is used to shut off an
external alarm condition. The MTU-M front panel ACO LED lights to indicate ACO
is on. The MTU-M front panel also contains an ACO push-buton.

" Procedure

To turn on ACO:

1. Type a at the maint –> prompt and press Enter.
or

2. Press the recessed ACO push button on the MTU-M front panel.

3. The ACO LED on the MTU-M front panel lights and the following message
appears:

I MTU-M MONITOR TASK Wed Mar 18 00:19:56 1998

...

turn on ACO

The ACO LED is turned off when the alarm condition that caused the external
alarm has cleared.

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6-9

MTU-M Maintenance Functions

Clearing MTU-M Alarms and Status Information (clear)

The clear option on the Maintenance menu is used to clear the current MTU-M
alarms and status information for a specific xTU.

NOTE:

Performance data is accumulated and stored by the MTU-M for each xTU.
Swapping or removing an xTU-C does not clear the data stored in these files
within the MTU-M. It is recommended that you clear performance statistics as
soon as possible after replacing or removing an xTU-C to avoid displaying
incorrect data.

" Procedure

To clear status and alarms:

1. Type c at the maint –> prompt.

2. Press Enter.

3. Enter the ID of the xTU (xtu id) you wish to clear.

Menu path: Main → Maintenance → clear

Maint ->clear

Select Command:

COMMAND DESCRIPTION

<2-80> – enter xtu id <2-80>

– (Current polling range: 2 to 16

Quit – Quit Command

enter xtu id:

For example, to clear the status and alarms of the xTU-C in Slot 5 of the primary
nest, type 5 at the enter htu id: prompt and press Enter. The following message
appears:

maint –>
I HTU-C/R 5 MUI TASK Wed Oct 20 15:19:56 1997
status and alarms cleared

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Clearing XTU-C Alarms from the MTU-M (al_clear)

The al_clear option on the Maintenance menu is used to clear the current MTU-M
alarms for a specific xTU.

" Procedure

To clear alarms:

1. Type al at the maint –> prompt.

2. Press Enter.

3. Enter the ID of the xTU (xtu id) you wish to clear.

Menu path: Main → Maintenance → clear

Maint ->al_clear

MTU-M Maintenance Functions

Select Command:

COMMAND DESCRIPTION

<2-80> – enter xtu id <2-80>

– (Current polling range: 2 to 16

Quit – Quit Command

enter xtu id:

The following message appears:

maint –>
I HTU-C/R 5 MUI TASK Wed mar 18 15:19:56 1998
alarms cleared

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6-11

MTU-M Maintenance Functions

Taking the xTU-C out of the MTU-M Polling Cycle (stoppoll)

The stoppoll option on the Maintenance menu is used to halt the monitoring and
alarm reporting of a specific xTU-C/R pair by removing it from the MTU-M polling
cycle.

NOTE:

Communications between the xTU-C/R pair are not affected; however,
removing the xTU-C from the polling cycle generates an abnormal alarm at
the MTU-M front panel (refer to Chapter 7,
information on MTU-M front panel LEDs).

" Procedure

To remove an xTU-C from the MTU-M polling cycle:

1. Type stop at the maint –> prompt and press Enter.

2. Type the ID of the xTU-C (xtu id) you wish to remove from the MTU-M polling
cycle.

The following message appears:

Polling Maintenance Out of Service takes an xTU-C/R out of the
MTU-M’s polling loop. This does not affect xTU-C/R’s operation,
but disables the MTU-M’s communications with the xTU-C/R.

MTU-M Front Panel

, for

3. Press Enter.
The following message appears:

I HTU-C/R 3 MUI TASK Wed Jul 1 15:10:26 1997
xTU-C/R placed in Polling MOS

Placing the xTU-C Back into the MTU-M Polling Cycle (pollstart)

The pollstart option on the Maintenance Menu is used to restart the monitoring
and alarm reporting of an xTU-C by placing it back in the MTU-M polling cycle.

" Procedure

To place an xTU-C back into the MTU-M polling cycle:

1. Type p at the maint –> prompt and press Enter.

2. Type the ID of the xTU-C (xtu id) you want to place back into the MTU-M
polling cycle.

The following message appears:

I HTU-C/R 3 MUI TASK Wed Sept 14:02:37 1997
xTU-C/R removed from Polling MOS

6-12

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7900-A2-GB20-00

MTU-M Front Panel

What to Monitor

The MTU-M allows you to monitor the health and status of an xTU-C/R pair from
the MTU-M front panel. The MTU-M front panel consists of:

H Major, minor, and abnormal alarm LEDs

7

MTU-M

POWER
FAIL
NMS LINK

MODEM

ALARMS

MAJOR
MINOR
ABNML

ACO
ACTIVE

RESET

C
O
N
S
O
L
E

97-15665

H Alarm Cut Off (ACO) push button and LED to shut off external alarms

You can also monitor system and
the MTU-M (refer to Chapter 4,

MTU-M Status and Performance Functions

x

TU-C/R status from a terminal connected to

System Terminal Interface

).

, and Chapter 5,

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7-1

MTU-M Front Panel

MTU-M Front Panel LEDs

The MTU-M front panel LEDs indicate the presence of system, network, and loop
error conditions. If a Major or Abnormal alarm condition exists in the network or
loop, the MAJOR and ABNML alarm LEDs light indicating there is an alarm
condition. Further isolation of the alarm condition is performed using the system
terminal. Minor alarm circuitry is not currently used.

Alarm Cut Off (ACO)

The ACO push button and LED allow you to manually shut off external alarms
generated by the MTU-M. After pressing ACO, the ACO LED lights indicating
ACO is active. ACO does not prevent alarms from being reported to the MTU-M
system terminal.

Reset

The RESET push button allows you to manually reset the MTU-M. This feature
performs the same reset of the MTU-M provided by the Reset option from the
Main Menu screen.

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MTU-M Alarms

Overview

This chapter provides instructions on how to:

H Configure alarm parameters for the Hotwire 7900 MTU-M, and
H Display alarms.

The MTU-M monitors and stores alarms. These alarms are then displayed
automatically or manually from the MTU-M front panel or VT100-compatible
terminal. MTU-M front panel alarms are described in Chapter 7,

Panel

VT100-compatible terminal as they occur or suppressed from automatic display and
displayed manually .

8

MTU-M Front

. Alarms can be selected to be automatically displayed at the

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8-1

MTU-M Alarms

Accessing MTU-M Alarm Functions

To access the MTU-M Alarms menu from the MTU-M Main Menu, type a at the
MTU-M –> prompt and press Enter. The Alarms menu appears as follows:

Menu path: Main → Alarms

MTU-M Alarms Menu
Select Command:

COMMAND DESCRIPTION

Alarm on – Display MTU-M alarms

– (Case sensitive, or use ’ALARM ON’)

Alarm off – Turn off display of MTU-M alarms

– (Case sensitive, or use ’ALARM OFF’)
Clear – Reset Alarm Display Pointer
Display – Display MTU-M alarms
Redisplay – Redisplay MTU-M alarms
Quit – Quit Command

Alarms ->

Command Function

Alarm on Allows alarms to display at the system terminal.
Alarm off Prevents alarms from displaying at the system terminal.
Clear Clears the current MTU-M alarm buffer.
Display Allows you to group and view alarms by category, view individual alarms,

or view all alarms. Refer to the screen samples following this table for

further detail on the display alarm function.
Redisplay Allows you to redisplay the last alarms viewed.
Quit Takes you back to the MTU-M Main Menu.

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7900-A2-GB20-00

Alarm On/Off Options

The MTU-M allows you to prevent alarms from being displayed at the system
terminal.

Alarms can be suppressed from view at the system terminal by typing alarm off at
any MTU-M prompt on the system terminal. The alarm off function only prevents
alarms from being displayed at the system terminal. Alarms can be redisplayed at
the system terminal by typing alarm on at any prompt. MTU-M Alarms can be
viewed manually at the system terminal using the display alarm command from the
MTU-M Alarms menu. The MTU-M display alarm function allows you to:

H Select alarms by level (all, major, abnormal)
H Select an individual xTU-C alarm, all alarms, or system alarms (MTU-M)
H Select the number of alarms to view (from 1–255 or all)

Display Alarm Option

This section provides instructions on how to use the MTU-M display alarm
function.

MTU-M Alarms

To view a single alarm or a group of alarms from a single
or the MTU-M you must:

H Select an alarm level (all, major, abnormal), then
H Select an individual xTU-C alarm, all alarms, or system alarms (MTU-M),

then

H Select the number of alarms you wish to view (from 1–255 or all)

xTU-C, multiple xTU-C,

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8-3

MTU-M Alarms

" Pr ocedure

1. Type d at the Alarms –> prompt and press Enter.

The Alarm Level Display menu appears as follows:

Menu path: Main → Alarms → Display

Alarms ->d

Alarm Level Display Menu
Select Command:

COMMAND DESCRIPTION

All – Select all alarm levels
Major – Select Major alarms only
Minor – Select Minor alarms only
Info – Select Info alarms only
Both – Select Major and Minor alarms
Quit – Quit Command

select alarm level –>

2. Select an alarm category from the Alarm Level Display menu.

NOTE:

Minor alarms are not currently used.

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March 1998

7900-A2-GB20-00

MTU-M Alarms

The following menu appears, allowing you to select an individual xTU-C id
(2–80), system (MTU-M), or all alarms for display:

Menu path: Main → Alarms → Display → alarm level

select alarm level –>major

Select Command:

COMMAND DESCRIPTION

all – enter ALL to select all xtu’s
system – enter SYSTEM to select MTU-M
<2-80> – enter xtu id <2-80>
Quit – Quit Command

enter xtu id or SYSTEM or ALL

:

3. Enter the alarm level from the id menu.

The following menu appears, allowing you to select the number of alarms to
display:

Menu path: Main → Alarms → Display → alarm level → (xtu id, system, all)

Select Command:3

COMMAND DESCRIPTION

Quit – Quit Command
all – enter ALL to select all valid entries
<0-255> – enter a number:

enter number of alarms to display:

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8-5

MTU-M Alarms

4. Select the number of alarms to display and press Enter. The following is an

example of the alarm display format:

Menu path: Main → Alarms → Display → alarm level → (xtu id, system, all)
(all, 0-255)

I HTU C/R 3 HSTATUS TASK Wed June 30 00:00:13 1997

Polling state change detected for HTU 3
polling state HTU 3

I HTU C/R 5 HSTATUS TASK Wed June 30 00:00:19 1997

status received from new card

I HTU C/R 6 HSTATUS TASK Wed June 30 00:00:48 1997

status received from new card

I HTU C/R 8 HSTATUS TASK Wed June 30 00:00:53 1997

Polling state change detected for HTU 3
polling state HTU 3

I HTU C/R 5 HSTATUS TASK Wed June 30 00:00:56 1997

status received from new card

Hit ’q’ to quit or return to continue ...

→

Alarm Definitions

The following section defines major and abnormal alarms. Minor alarms are not
currently used.

Major Alarms

Major alarms occur when:

H The xTU-C polling state changes from in service (INS) to out of service

H The CP or CO carrier changes from up to down (not an alarm condition for

H The status of Loop A or Loop B changes from up to down at the CO or CP.

(OOS).

V.35).

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Clearing Major Alarms

Major alarms can be cleared:

H Automatically when the xTU-C polling state changes from out of service

(OOS) back to in service (INS).

H Automatically when the CO or CP carrier is restored.
H Manually by selecting the Clear option from the MTU-M Maintenance menu.

Abnormal Alarms

Abnormal alarms occur when an xTU-C is placed in maintenance out of service
(MOS). Placing an xTU-C in MOS takes the xTU-C out of the MTU-M polling
cycle, allowing maintenance to be performed without continuously displaying
alarms.

Clearing Abnormal Alarms

MTU-M Alarms

Abnormal alarms are automatically cleared when an xTU-C is placed back in
service.

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8-7

MTU-M Alarms

Resetting the MTU-M

The reset option allows you to reset the system (MTU-M) or a specific xTU-C/R
pair.

" Procedure

To reset the MTU-M:

1. At the MTU-M Main Menu screen MTU-M–> prompt, type r and press Enter.

The select command menu appears and prompts you to enter an xTU id or
system (to reset the MTU-M).

2. Type s at the Enter xtu id or system: prompt and press Enter.

The following message appears:

Are you sure you want to reset the MTU-M? (Y/N)?

3. Type Y and press Enter.

The MTU-M resets and clears all stored performance and alarm data.

After resetting the MTU-M, the status of each xTU-C displays.

Resetting the xTU-C/R

" Procedure

To reset an individual xTU-C/R pair:

1. Type r at the MTU-M–> prompt and press Enter.

The select command menu appears and prompts you enter an xTU id or
system.

2. Type the ID of an xTU-C (2–80) at the Enter xtu id or system: prompt and

press Enter.
The following message appears:

Are you sure you want to reset the xTU-C/R? (Y/N)?

3. Type Y and press Enter.

The MTU-M sends a reset command to the
resets and sends updated status information to the MTU-M.

xTU-C/R pair. The xTU-C/R

8-8

March 1998

7900-A2-GB20-00

Testing

Detecting a Problem

The MTU-M can detect and report problem conditions and allow you to perform
diagnostic testing of the xTU-C/R pair. The MTU-M offers a number of indicators
to alert you to possible problems, as described in Chapter 7,

Once you have detected a problem, you can further isolate the problem to your
local equipment, remote equipment, or the copper lines.

9

MTU-M Front Panel.

Understanding Loopbacks

A loopback is a diagnostic function that enables a technician to isolate equipment
on the DSL circuit to determine where on the circuit trouble may be occurring.
Loopback takes the system offline. Data received from T1 or E1 application
equipment is looped back as shown in the following sections.

Local and remote refer to the point at which the data is looped back. In a local
loopback, the data is reflected back by the local unit (the unit that initiated the
loopback). In a remote loopback, the data is passed on to the remote (far-end)
unit and then reflected back.

Local and Remote loopback tests may be initiated from either the CO or CP end
of the loop, however, the MTU-M only communicates with the the local xTU-C
(CO).

7900-A2-GB20-00

March 1998

9-1

Testing

Accessing Loopback Functions

To access loopback functions, type l (for local) at the MTU-M –> prompt and
press Enter. The following menu appears allowing you to select local or remote
loopback testing:

Menu path: Main → Loopback

Select Command:

COMMAND DESCRIPTION

Local – Local xTU?
Remote – Remote xTU?
Quit – Quit Command

Select local or remote –>

9-2

March 1998

7900-A2-GB20-00

Running a Local Loopback

Procedure

"

To run a local loopback:

1. Type l (for local) at the Select local or remote –> prompt and press Enter.

A screen appears and you are prompted to enter an

2. Enter the number of the

press Enter.
The following message appears:

I HTU C/R HSTATUS TASK MON JAN 1 01:29:05 1997
State change received from DSL 7
HTU-C loopback is ON

Running a Remote Loopback

The MTU-M prevents loopback tests from being run for 1 minute after power is
initially applied to the MTU-M or system reset is performed.

Testing

xTU id.

xTU-C you are performing loopback testing on and

" Procedure

To run a remote loopback:

1. At the Select local or remote –> prompt, type r (for remote) and press Enter.

A screen appears and you are prompted to enter an

2. Enter the number of the

press Enter.
The following message appears:

I HTU C/R HSTATUS TASK MON JAN 1 01:35:10 1997
State change received from DSL 7
HTU-R loopback is ON

Ending a Loopback

To stop a local or remote loopback test, repeat the steps in

Loopback

A message stating that the xTU-C/R loopback test is off appears.

xTU-C you want to perform loopback testing on and

and

Running a Remote Loopback

xTU id:

Running a Local

.

7900-A2-GB20-00

March 1998

9-3

Testing

HDSL T1 Loopback Tests

Local Loopback Test

When a local loopback is enabled, the red Loop Bk LED on the front panel of the
initiating unit (CO or CP) lights up and remains lit until the loopback is disabled.

Nest

CO

CP

Diagnostic

E1 HDSL

Equipment

Loop Bk

LED Lights

VT100 T erminal

or Emulator

Figure 9-1. Local Loopback, Initiated at the CO Unit

CO CP

Diagnostic

Equipment

Nest

E1 HDSL

7900

7900

7900

7900

Diagnostic

Equipment

97-15630

Diagnostic

Equipment

Loop Bk

LED Lights

Figure 9-2. Local Loopback, Initiated at the CP Unit

9-4

March 1998

VT100 T erminal

or Emulator

97-15631

7900-A2-GB20-00

Remote Loopback Test

When a remote loopback is enabled, the red Loop Bk LED on the front panel of
remote-end unit (CO or CP) lights up and remains lit until the loopback is
disabled. The loopback LED on the initiating unit does not light. A message
appears on the remote end unit reporting that it has been put into loopback.

Diagnostic

Equipment

CO CP

E1 HDSL

7900

7900

Loop Bk

LED lights

AIS

E1 HDSL

7900

7900

Diagnostic

Equipment

AIS = Alarm Indication Signal

Testing

Terminal

Figure 9-3. Remote Loopback, Initiated at the CO Unit

CO CP

Diagnostic
Equipment

Nest

Loop Bk

LED Lights

E1 HDSL

VT100 T erminal

or Emulator

Figure 9-4. Remote Loopback, Initiated at the CP Unit

97-15515

Diagnostic

7900

7900

Equipment

97-15629

7900-A2-GB20-00

March 1998

9-5

Testing

HDSL E1 Loopback Tests

Local Loopback Test

When a local loopback is enabled, the red Loop Bk LED on the front panel of the
local unit lights up and remains lit until the loopback is disabled.

Nest

CO

CP

Diagnostic

E1 HDSL

Equipment

Loop Bk

LED Lights

VT100 T erminal

or Emulator

Figure 9-5. Local Loopback, Initiated at the CO Unit

CO CP

Diagnostic
Equipment

Nest

E1 HDSL

7900

7900

7900

7900

Diagnostic

Equipment

97-15630

Diagnostic

Equipment

Loop Bk

LED Lights

Figure 9-6. Local Loopback initiated at the CP Unit

9-6

March 1998

VT100 T erminal

or Emulator

97-15631

7900-A2-GB20-00

Remote Loopback Test

When a remote loopback is enabled, the red Loop Bk LED on the front panel of
the remote (far-end) unit lights up and remains lit until the loopback is disabled.
The Loop Bk LED on the local (initiating) unit does not light.

Testing

Nest

Diagnostic

CO

E1 HDSL

Equipment

Loop Bk

LED Lights

VT100 T erminal

or Emulator

Figure 9-7. Remote Loopback initiated at the CO unit

CO CP

Diagnostic

Equipment

Nest

Loop Bk

LED Lights

E1 HDSL

CP

Diagnostic

7900

7900

Equipment

97-15628

Diagnostic

7900

7900

Equipment

Figure 9-8. Remote Loopback initiated at the CP Unit

7900-A2-GB20-00

March 1998

VT100 T erminal

or Emulator

97-15629

9-7

Testing

SDSL E1 Loopback Tests

Local loopback Test

When a local loopback is enabled, the red Loop Bk LED on the front panel of the
local unit lights up and remains lit until the loopback is disabled.

Nest

CO

CP

Diagnostic

E1 HDSL

Equipment

Loop Bk

LED Lights

VT100 T erminal

or Emulator

Figure 9-9. Local Loopback Initiated by the CO Unit

CO CP

Diagnostic
Equipment

Nest

E1 HDSL

7900

7900

7900

7900

Diagnostic

Equipment

97-15630

Diagnostic

Equipment

Loop Bk

LED Lights

Figure 9-10. Local Loopback Initiated by the CP Unit

9-8

March 1998

VT100 T erminal

or Emulator

97-15631

7900-A2-GB20-00

Remote Loopback Test

When a remote loopback is enabled, the red Loop Bk LED on the front panel of
the remote (far-end) unit lights up and remains lit until the loopback is disabled.
The Loop Bk LED on the local (initiating) unit does not light.

Testing

Nest

Diagnostic

CO

E1 HDSL

Equipment

Loop Bk

LED Lights

VT100 T erminal

or Emulator

Figure 9-11. Remote Loopback Initiated by the CO unit

CO CP

Diagnostic

Equipment

Nest

Loop Bk

LED Lights

E1 HDSL

CP

Diagnostic

7900

7900

Equipment

97-15628

Diagnostic

7900

7900

Equipment

Figure 9-12. Remote Loopback Initiated by the CP Unit

7900-A2-GB20-00

March 1998

VT100 T erminal

or Emulator

97-15629

9-9

Testing

SDSL T1 Loopback Tests

Local loopback Test

When a local loopback is enabled, the red Loop Bk LED on the front panel of the
local unit lights up and remains lit until the loopback is disabled.

Nest

CO

CP

Diagnostic

E1 HDSL

Equipment

Loop Bk

LED Lights

VT100 T erminal

or Emulator

Figure 9-13. Local Loopback Initiated by the CO Unit

CO CP

Diagnostic
Equipment

Nest

E1 HDSL

7900

7900

7900

7900

Diagnostic

Equipment

97-15630

Diagnostic

Equipment

Loop Bk

LED Lights

Figure 9-14. Local Loopback Initiated by the CP Unit

9-10

March 1998

VT100 T erminal

or Emulator

97-15631

7900-A2-GB20-00

Remote Loopback Test

When a remote loopback is enabled, the red Loop Bk LED on the front panel of
the remote (far-end) unit lights up and remains lit until the loopback is disabled.
The Loop Bk LED on the local (initiating) unit does not light.

Testing

Nest

Diagnostic

CO

E1 HDSL

Equipment

Loop Bk

LED Lights

VT100 T erminal

or Emulator

Figure 9-15. Remote Loopback Initiated by the CO unit

CO CP

Diagnostic

Equipment

Nest

Loop Bk

LED Lights

E1 HDSL

CP

Diagnostic

7900

7900

Equipment

97-15628

Diagnostic

7900

7900

Equipment

Figure 9-16. Remote Loopback Initiated by the CP Unit

7900-A2-GB20-00

March 1998

VT100 T erminal

or Emulator

97-15629

9-11

Testing

This page intentionally left blank.

9-12

March 1998

7900-A2-GB20-00

Cable Pin Assignments

2

Terminal Connection Cable Pin Assignments

This section defines the pin assignments for the terminal cable from the front
panel DB9 connector jack to your system terminal’s COM port.

If your system terminal COM port requires a 9-pin D-shell connector, use the
following pin assignments.

A

DB9 DB9

RXD

TXD

GND

RTS
CTS

3
2
5
7
8

3

RXD

2

TXD

5

GND

7

RTS

8

CTS

97-1570

7900-A2-GB20-00

March 1998

A-1

Cable Pin Assignments

3

If your system terminal COM port requires a 25-pin D-shell connector, use the
following pin assignments.

NOTE:

You can build a custom cable using industry-standard cable accessories or
connect a generic DB9-to-DB25 adapter to the terminal cable supplied with
the HTU-M.

RXD

TXD

GND

CTS
RTS

9-Pin

3
2
5
8
7

25-Pin

2
3
7
4
5

RXD
TXD
GND
RTS
CTS

97-1570

A-2

7900-A2-GB20-00March 1998

Netconfig and Sysconfig Menu
Values

Record your system (operational) configuration parameters.

B

Field

Polling Range 2-80
Polling interval 5
Pollto 25/256th seconds
Initial alarm on/off

setting
Initial menu on/off

setting
Console port baud rate 9600

Record your network management configuration parameters.

Field

IP Address 000.000.000.000.000
Subnet Mask 000.000.000.000.000
SNMP Manager

Address
Default Gateway

Address

Default Value Current Value

ON

ON

Default Value Current Value

0:192.1.1.2

000.000.000.000.000

Broadcast Address 255.255.255.255.255
System Contact who?
System Name what? (MTUM)
System Location where?

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March 1998

B-1

Netconfig and Sysconfig Menu Values

This page intentionally left blank.

B-2

7900-A2-GB20-00March 1998

SNMP Traps

SNMP Traps

C

This section describes the unit’s compliance with SNMP standards and any
special operational features for the SNMP traps supported. The unit supports the
following traps:

H warmStart
H linkUp

warmStart

H linkDown

SNMP Trap Description Possible Cause

warmStart The unit has reinitialized

itself.
The trap is sent after the

unit resets and stabilizes.
There are no

variable-bindings.

H Reset command.
H Power disruption.

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March 1998

C-1

SNMP Traps

linkUp and linkDown

The link SNMP traps are:

H linkUp – The unit recognizes that one of the communication interfaces is

operational.

H linkDown – The unit recognizes that one of the communication interfaces is

not operational.

SNMP Trap

linkUp The interface for the local

linkDown The interface for the local

Description Possible Cause

or remote unit is up.

or remote unit is down.

H Units are up
H MTU-M completed initial

power up or reset

H One of the unit’s network

interfaces is down

C-2

7900-A2-GB20-00March 1998

Glossary

AMI

BPV

Bridged tap

CD

Champ connector

CO

COM port

CP
CPE

CRC

CTS

Alternate Mark Inversion. A line coding technique used to accommodate the ones density
requirements of E1 or T1 lines.

Bipolar Violation. In a bipolar signal, a one (mark, pulse) which has the same polarity as its
predecessor.

Any part of the local loop that is not in the direct talking path between the CO and the
service user.

Carrier Detect. A signal indicating that energy exists on the transmission circuit.
Associated with Pin 8 on an EIA-232 interface.

64-pin connector used to connect the E1/T1 network or local loop to the HotWire 7900
Nest connectors J5, J6, and J7.

Central Office/Central Site. The PSTN facility that houses one or more switches serving
local telephone subscribers.

Communications port. A computer’s serial communications port used to transmit to and
receive data from a modem. The modem connects directly to this port.

Customer Premises.
Customer Premises Equipment. Terminal equipment on the service user’s side of the

telecommunications network interface.
Cyclic Redundancy Check. A mathematical method of confirming the integrity of received

digital data.
Clear to Send. An EIA-lead standard for V.24 circuit CT 106; an output signal

(DCE-to-DTE).

CV

DCE

DSR

DSX-1

DTE

DTR

7900-A2-GB20-00

Code Violation. Detected when using HDB3 coding format, this is equivalent to a BPV
when using AMI coding.

Data Communications Equipment. The equipment that provides the functions required to
establish, maintain, and end a connection. It also provides the signal conversion required
for communication between the DTE and the network.

Data Set Ready . A signal from the modem to the DTE that indicates the modem is turned
ON and connected to the DTE.

Digital Signal Cross Connect level 1. An interconnection point for terminals, multiplexers
and transmission facilities.

Data Terminal Equipment. The equipment, such as a computer or terminal, that provides
data in the form of digital signals for transmission.

Data Terminal Ready. A signal from the DTE to the modem, sent via Pin 20 of the
EIA-232 interface (V.24 circuit 108/1, /2), that indicates the DTE is turned ON and
connected to the modem.

March 1998

GL-1

Glossary

E1

ETSI

FAS
FAW
FCC

FEBE
G.703

HDB3

HDSL

HTU
HTU-C

HTU-M

A wideband digital interface operating at 2.048 Mbps, defined by ITU recommendations
G.703 and G.704. It is used primarily outside North America.

European Telecommunications Standardization Institute. An organization that produces
technical standards in the area of telecommunications.

Frame Alignment Signal. A loss of signal (LOS) error detection.
Frame Alignment Word. A loss of synchronization error detection.
Federal Communications Commission. The Board of Commissioners that regulates all

electrical communications that originate in the United States.
Far-End Block Error. Block errors reported by remote equipment.
An ITU recommendation for the physical and logical characteristics of hierarchical digital

devices.
High Density Bipolar Three Zeros Substitution. A line coding technique used to

accommodate the ones density requirements of E1 lines.
High-bit-rate Digital Subscriber Line. A technique for high bandwidth, bidirectional

transmission over copper wire for T1 and E1 services.
Host Termination Unit. A generic reference to either an HTU-C or HTU-R module.
Host Termination Unit – Central. The module at the CO (central office) or central site end

of an HDSL connection. Also known as a Line Termination Unit (LTU).
Host Termination Unit – Maintenance. A carrier-mounted module used to perform

maintenance operations on one or more HTU-R and HTU-C modules.

HTU-R

HTU-S

LED

loopbackloopback

OOF
reset
RTS

RXD

Host Termination Unit – Remote. The module at the CP (customer premises) end of an
HDSL connection. Also known as a Network Termination Unit (NTU).

Host Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.

Light Emitting Diode. A light or status indicator that glows in response to the presence of a
certain condition (e.g., an alarm).

A diagnostic procedure that sends a test message back to its origination point. Used to
test various portions of a data link in order to isolate an equipment or data line problem.

Out Of Frame. An error condition in which frame synchronization bits are in error.
A reinitialization of the device that occurs at power-up or in response to a reset command.
Request to Send. A signal from the DTE to the device, indicating that the DTE has data to

send. V.24 circuit 105.
Received Data. Pin 3 of the EIA-232 interface that is used by the DTE to receive data from

the modem. Conversely , the modem uses Pin 3 to transmit data to the DTE.

GL-2

March 1998

7900-A2-GB20-00

Glossary

SDSL

STU
STU-C

STU-R

STU-S

TXD

T1

V.35

Symmetrical Digital Subscriber Line. A technique for the use of an existing twisted pair line
that permits high bandwidth, bidirectional transmission.

SDSL Termination Unit. A generic reference to either an STU-C or STU-R module.
SDSL Termination Unit – Central. The module at the CO (central office) or central site end

of an HDSL connection. Also known as a Line Termination Unit (LTU).
SDSL Termination Unit – Remote. The module at the CP (customer premises) end of an

HDSL connection. Also known as a Network Termination Unit (NTU).
SDSL Termination Unit – SNMP. The SNMP-compatible version of the Maintenance

Processor.
Transmit Data. Pin 2 of the EIA-232 interface that is used by the DTE to transmit data to

the modem. Conversely , the modem uses Pin 2 to receive data from the DTE.
A term for a digital carrier facility used to transmit a DS1 formatted digital signal at

1.544 Mbps. It is used primarily in North America.
An ITU-T standard for a high-speed, 34-position, DCE/DTE interface.

7900-A2-GB20-00

March 1998

GL-3

Glossary

This page intentionally left blank.

GL-4

March 1998

7900-A2-GB20-00

Index

A

Abnormal Alarms, 8-7

Clearing Abnormal Alarms, 8-7
Accessing the system for the first time, 3-1
Alarm Definitions, 8-6

Abnormal Alarms, 8-7

Major Alarms, 8-6
Alarms, 8-1

Alarm On/Off Options, 8-3

Display Alarm Option Procedures, 8-3

MTU-M Alarm Functions, 8-2

C

Cable Pin Assignments, A-1

Terminal, A-1
Cabling procedures, expansion nest cables, 2-3
Change Password, 6-8
COM port settings, 4-2
customer service, A

D

Display Alarm Option, 8-3

E

L

linkUp and linkDown traps, C-2
local loopback test, 9-6
loopback tests, 9-1

Accessing, 9-2
Ending a loopback , 9-3
HDSL E1 Loopback, 9-6
HDSL T1 Loopback, 9-4
Local Loopback, 9-3
Remote Loopback, 9-3
SDSL E1 Loopback, 9-8
SDSL T1 Loopback, 9-10
Understanding Loopback Tests, 9-1

M

Major Alarms, 8-6

Clearing Major Alarms, 8-7
model numbers, 1-1
MTU-M Alarms, 8-1

Alarm Definitions, 8-6

Alarm On/Off Options, 8-3
MTU-M features, 1-3
MTU-M Frone Panel, Front panel LEDs, 7-1
MTU-M Front Panel, 7-1
Multiple Nest Numbering Sequence, 2-4

ESD precautions, 2-1
expansion nest numbering sequence, 2-4

I

Initial setup instructions, 3-1

Additional Sysconfig Setup Considerations, 3-4
Network Configuration (Netconfig) Parameters, 3-2
System Configuration (Sysconfig) Parameters, 3-3

Installation Procedures, 2-1

Additional Nests, 2-3
External alarms, 2-4
MTU-M, 2-1
primary to expansion nests, 2-3

7900-A2-GB20-00 March 1998

N

Nest Numbering Sequence, 2-4
Netconfig Menu V alues, B-1

O

Overview, 1-1

P

PC requirements, 4-2

IN-1

Index

R

related documents, vi
remote loopback test, 9-5, 9-7, 9-9, 9-1 1
Resetting the MTU-M, 8-8
Resetting the xTU-C/R, 8-8

S

service information, A
Setup Instructions, 3-1
SNMP

linkUp and linkDown, C-2
traps, C-1
warmStart, C-1

Sysconfig Menu V alues, B-1

T

system terminal interface, 4-1
testing, 9-1
traps, SNMP, C-1

U

User interfaces, 1-3

W

warmStart, C-1
warranty telephone number, A

IN-2

March 1998

7900-A2-GB20-00