Paradyne 7510-A2-GB20-00 727 User Manual

AREA CODE CHANGE

Please note that the area code for
Paradyne Corporation in Largo, Florida
has changed from 813 to 727.

For any Paradyne telephone number that
appears in this manual with an 813 area
code, dial 727 instead.

MODEL 7510 DSU

USER’S GUIDE

Document No. 7510-A2-GB20-00

March 1997

Copyright  1997 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 Avenue North, P.O. Box 2826, Largo,
Florida 33779-2826.

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 sales or service representative directly for any help needed. For additional information concerning
warranty, service, repair, spare parts, installation, documentation, or training, use one of the following methods:

 Via the Internet: Visit the Paradyne World Wide Web 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
— International, call 813-530-2340

Printed on recycled paper

A

March 1997

7510-A2-GB20-00

Contents

About This Guide

 Document Purpose and Intended Audience v. . . . . . . . . . . . . . . . . . . . . . . . .

 Document Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Product-Related Documents vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 About the DSU

 Model 7510 DSU Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Typical DSU Configurations 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 User Interface Types 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear Panel Interface Connections 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Using the Asynchronous Terminal Interface

 Connecting to the Terminal Port 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Initiating an ATI Session 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Screen Format Types 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What Affects Screen Displays 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screen Work Areas 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Navigating the Screens 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Keyboard Keys 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screen Function Keys 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switching to the Screen Function Key Area 2-7. . . . . . . . . . . . . . . . . . . . .

 Ending an ATI Session 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Customizing the DSU

 Identifying the Device and System 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Saving Configuration Options 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Configuring the DSU 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuration Option Areas 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessing and Displaying Configuration Options 3-3. . . . . . . . . . . . . . . .

7510-A2-GB20-00

March 1997

i

Contents

4 Monitoring the DSU

 What to Monitor 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Viewing System and Test Status 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Health and Status 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Self-Test Results 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Test Status Messages 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Viewing Network Interface Status 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Viewing Network Performance Statistics 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . .

 Monitoring the LEDs 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System LEDs 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Network LEDs 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Port LEDs 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 T esting

 Accessing the Test Menu 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Running Network Tests 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CSU or External Network Loopback 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .

DSU or Internal Network Loopback 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Send V.54 Up/Down Sequences 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

511 Test Pattern for the Network 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Running Data Port Tests 5-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Local Loopback 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

511 Test Pattern for the DTE 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Running the Lamp Test 5-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Ending an Active Test 5-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Messages and Troubleshooting

 Messages and Troubleshooting 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Responding to Device Messages 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Troubleshooting 6-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Resetting the DSU 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Displaying DSU Identity Information 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ii

March 1997

7510-A2-GB20-00

A Configuration Option Tables

 Overview A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 System Options Menu A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Network Interface Options Menu A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Data Port Options Menu A-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Terminal Port Options A-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B W orksheets

 Overview B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Configuration Worksheets B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C Cables and Pin Assignments

 Overview C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Terminal Port EIA-232 Connector C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 V.35 User Data Port Connector C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Standard EIA-232-D Crossover Cable C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 LAN Adapter Converter and Cable C-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 Modular RJ48S DDS Network Interface Cable C-5. . . . . . . . . . . . . . . . . . . . . .

Contents

D Technical Specifications

Glossary

Index

7510-A2-GB20-00

March 1997

iii

About This Guide

Document Purpose and Intended Audience

This guide contains information needed to set up, configure, and operate the
Model 7510 DSU and is intended for installers and operators.

Document Summary

Section Description

Chapter 1

Chapter 2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Appendix A

Appendix B

Appendix C

About the DSU.

examples of typical configurations.

Using the Asynchronous Terminal Interface.

instructions for accessing the user interface and navigating
the screens.

Customizing the DSU.

the user interface and DSU configuration.

Monitoring the DSU.

LEDs, DSU status, and network statistics.

Testing.

setup.

Messages and Troubleshooting.

device messages and troubleshooting.

Configuration Option Tables.

options, default settings, and possible settings.

Worksheets.

settings, and possible settings to use for planning.

Cables and Pin Assignments.

interface details.

Provides details about available tests and test

Describes the DSU features and shows

Provides

Provides procedures for setting up

Describes monitoring details about the

Provides information on

Contains all configuration

Contains all the configuration options, default

Contains connector and

7510-A2-GB20-00

Appendix D

Technical Specifications.

specifications of the DSU.

March 1997

Contains physical and regulatory

v

About This Guide

Section Description

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

Product-Related Documents

Document Number Document Title

alphabetical order.

7510-A2-GN10

To order additional product documentation, refer to

Information

on page A at the beginning of this User’s Guide.

Model 7510 DSU Startup Instructions

Warranty, Sales, and Service

vi

March 1997

7510-A2-GB20-00

About the DSU

Model 7510 DSU Features

The DSU provides an interface between the customer premises equipment (CPE)
and a Digital Data Service (DDS) network.

The DSU’s features and capabilities include:

 Easy Installation. Connects to your equipment using standard connectors

and cables.

1

 Easy Configuration. A compact and well-thought set of configuration options

minimizes your customization effort.

 DDS Operation. Operates at 56 and 64 kbps CC (clear channel).
 Local Area Data Set (LADS) Operation. Operates at 56 and 64 kbps

full-duplex as a limited-distance modem.

 Autorating. Automatically adjusts to the detected line rate.
 Data Port Rates. Automatically adjusts to the DDS or LADS operating rates.
 Asynchronous T erminal Interface (ATI). Provides a menu-driven

VT100-compatible interface for configuring and managing the DSU.

— Local Management. Provides local management using an asynchronous

terminal connection through the Terminal port.

— Remote Management. Provides remote management using an external

modem through the Terminal port.

 Diagnostics. Lets you diagnose device and network problems with digital

loopbacks and pattern tests.

 Device and Test Monitoring. Lets you track and evaluate the unit’s

operation with status and test result information.

7510-A2-GB20-00

March 1997

1-1

About the DSU

Typical DSU Configurations

The following illustration shows a typical LAN/WAN interconnection application for
the DSU. The routers connected to the DSU at each location provide the LAN
interconnection.

Router

DDS

Network

DSU DSU

Router

497-15084-01

The DSU can also be used in a Frame Relay network.

Frame

Router

Relay

Network

DSU DSU

Router

497-15271

Two DSUs can be connected back-to-back to act as Local Area Data Sets.

Router

56 Kbps

Router

1-2

DSU DSU

497-15236

Table D-2 in Appendix D shows the maximum distances for LADS applications.

March 1997

7510-A2-GB20-00

User Interfaces

7

About the DSU

There are two types of user interfaces for the DSU:

 Menu-driven Asynchronous Terminal Interface (ATI) screens (see

Asynchronous Terminal Interface

 Front panel LED status indicators (see

56/64K

Rear Panel Interfaces

The following illustration shows the physical interfaces of the DSU. Information
about the installation of the DSU is contained in the

Instructions

Using the

, Chapter 2).

7510 DSU

Monitoring the DSU

OK

ALARM

TESTDMOOS

System Network

OOFNSTXD (103)

, Chapter 4).

RXD (104)

RTS (105)

CTS (106)

Port

DTR (108)

497-15245

Model 7510 DSU Startup

.

Terminal

POWER

Power

or

TERMINAL

Modem

DTE

D
T
E

NETWORK

Network

497-1523

7510-A2-GB20-00

March 1997

1-3

Using the Asynchronous Terminal Interface

Connecting to the Terminal Port

The device used for the Asynchronous Terminal Interface (ATI) can be a
VT100-compatible async terminal, or a PC running emulation software. The
terminal or PC can be connected to the Terminal port directly, or through an
external modem.

Ensure that the device you connect communicates using these settings:

2

 Data rate set to 9.6 kbps.
 Character length set to 8.
 Parity set to None.
 Stop Bits set to 1.

Terminal port settings cannot be changed from the ATI.

7510-A2-GB20-00

March 1997

2-1

Using the Asynchronous Terminal Interface

Initiating an ATI Session

The user interface is blank until activated. Press Return to activate the user
interface. The first time you do this the Main Menu screen is displayed.

main
Device Name: Model: 7510

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Ctrl-a to access these functions E

MAIN MENU

Status
Test
Configuration
Control

xit

Entry to all of the DSU’s tasks begins at the Main Menu screen, which has four
menus or branches.

Select . . .

Status View results of diagnostic tests, network status of interfaces, statistics,

Test Select and cancel tests for the DSU’s interfaces.
Configuration Display and edit the configuration options.
Control Establish identification for the DSU and system, or to initiate a power-up

To . . .

LEDs, and DSU identity information.

reset of the DSU.

2-2

March 1997

7510-A2-GB20-00

Using the Asynchronous Terminal Interface

MAIN MENU
Status
Test
Configuration
Control

Load
Configuration
From...

Status

• System and Test Status

• Network Interface Status

• Network Performance
Statistics

• Display LEDs

• Identity

Screen Format Types

Three types of screen formats are available on the ATI.

Use the screen format . . .

Menu selection Display a list of available functions for user selection.
Input Add or change information on a screen.

Display Display configuration information and results from

Test

• Network T ests

• Data Port Tests

• Lamp Test

• Abort All Tests

Configuration
Edit/Display

• System

• Network

• Data Port

• Terminal Port

Control

• Device Name

• Reset Device

497-15238

To . . .

Input or edit fields that have an Underline
or selection. See

performance and DSU-specific tests.
Display-only fields that have no underline in the field value.

Screen Work Areas

in the field value

.

What Affects Screen Displays

What appears on the screens depends on the:

 Current configuration – How the DSU is currently configured.
 Data selection criteria – What you entered in previous screens.

7510-A2-GB20-00

March 1997

2-3

Using the Asynchronous Terminal Interface

Screen Work Areas

There are two user work areas:

 Screen area – This is the area above the dotted line that provides the menu

path, menus, and input fields.
The menu path appears as the first line on the screen. In this manual, the

menu path is presented as a menu selection sequence with the names of the
screens:

Main Menu→Configuration (Load Configuration From)→
Configuration Edit/Display

 Screen function key area – This is the area below the dotted line that lists

function keys specific to the screen, field value choices, and system
messages.

Menu Path

main/configuration/edit/port
Device Name: Node A Model: 7510

→

Data Port Options

Screen

Function

Keys

Field V alue

Choices

DATA PORT OPTIONS

Invert Transmit Clock: Disable
Port (DTE) Initiated Loopbacks: Disable
Bilateral Loopback: Disable
Carrier Control by RTS: Constant
CTS Control: Standard
RLSD Control: Standard
DSR Control: Standard
Monitor DTR: Enable

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Ctrl-a to access these functions, ESC for previous menu M
S

ave

Select: Disable, Enable No Signal

Input Fields

ainMenu Exit

System

Messages

2-4

March 1997

7510-A2-GB20-00

Navigating the Screens

You can navigate the screens by:

H Using keyboard keys
H Using screen function keys
H Switching between the two screen work areas

Keyboard Keys

Use the following keyboard keys to navigate within the screen.

Using the Asynchronous Terminal Interface

To . . .

Move cursor between the screen area and the screen function
keys area below the dotted line at the bottom of the screen

Return to the previous screen Esc
Move cursor to the next field on the screen Tab
Accept entry or display valid options on the last row of the screen

when pressed before entering data or after entering invalid data
Move cursor to the previous field Ctrl-k
Select the next valid value for the field Spacebar
Delete character that the cursor is on Delete (Del)
Move cursor up one field within a column on the same screen Up Arrow or Ctrl-u
Move cursor down one field within a column on the same screen Down Arrow or Ctrl-d
Move cursor one character to the right in a text field Right Arrow or Ctrl-f
Move cursor one character to the left in a text field Left Arrow or Ctrl-b
Redraw the screen display , clearing information typed in but not

yet entered

Press . . .

Ctrl-a

Return (Enter)

Ctrl-l

7510-A2-GB20-00

" Procedure

To make a menu or field selection:

1. Press the tab key or the right arrow key to position the cursor on a menu or
field selection. Each selection is highlighted as you press the key to move the
cursor from position to position.

2. Press Return. The selected menu or screen appears.

3. Continue Steps 1 and 2 until you reach the screen you want.

March 1997

2-5

Using the Asynchronous Terminal Interface

The current setting or value appears to the right of the field name. The valid
choices for the field are displayed in the screen function area. You can enter
information into a selected field by typing in the first letter or letters of a field value
or command.

If a field is blank and the Field Values screen area displays valid selections, press
the spacebar and the first valid value for the field will appear. Continue pressing
the spacebar to scroll through other valid values.

Screen Function Keys

All screen function keys located below the dotted line operate the same way
(upper- or lowercase) throughout the screens.

For the screen
function . . .

MainMenu M or m Return to the Main Menu screen.
Exit E or e Terminate the async terminal session.

Select . . . And press Return to . . .

Save S or s Save information.
Refresh R or r Update screen with current information.
ClrStats C or c Clear network performance statistics and refresh the

screen.
PgUp U or u Display the previous page.
PgDn D or d Display the next page.
ResetMon R or r Reset an active Monitor 511 test counter to zero.

2-6

March 1997

7510-A2-GB20-00

Switching to the Screen Function Key Area

Selecting Ctrl-a allows you to switch between the two screen work areas to
perform all screen functions.

 Procedure

To access the screen function area below the dotted line:

1. Press Ctrl-a to switch from the screen area to the screen function key area
below the dotted line. The available selections for the first input field appear
on the last line as shown below.

2. Select either the function’s designated (underlined) character or press the tab
key until you reach the desired function key.

Example:

To reset the Monitor 511 error counter to zero, type r or R (ResetMon).

3. Press Return. The function is performed.

4. To return to the screen area above the dotted line, press Ctrl-a again.

Using the Asynchronous Terminal Interface

main/test/network
Device Name: Model: 7510

NETWORK TESTS

Test Command Status Result

CSU Loopback: Start Inactive 0:00:00
DSU Loopback: Start Inactive 0:00:00

Send V.54 Up: Send Sending
Send V.54 Down: Send Inactive

Send 511: Start Inactive 0:00:00
Monitor 511: Stop Active 125:08:48 Errors 99999+

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Ctrl-a to access these functions, ESC for previous menu M
R

esetMon

ainMenu Exit

7510-A2-GB20-00

March 1997

2-7

Using the Asynchronous Terminal Interface

Ending an ATI Session

Use the Exit function key from any screen to terminate the session.

 Procedure

To end an ATI session:

1. Press Ctrl-a to go to the screen function key area below the dotted line.

2. Save changes if required. A confirmation message appears if you have made
but not saved changes to your configuration.

3. Tab to E
appears.

xit (or type e or E) and press Return. The User Interface Idle screen

2-8

March 1997

7510-A2-GB20-00

Customizing the DSU

Identifying the Device and System

Use the Device Name screen to determine the name that will be displayed at the
top of all ATI screens, and system information that will be displayed on the
Identity screen. To access the Device Name screen, follow this menu selection
sequence:

Main Menu→Control→Device Name

3

main/control/device name
Device Name: Node A Model: 7510

DEVICE NAME

Device Name: Node A
System Name: ________________________________________ Clear
System Location: ________________________________________ Clear
System Contact: ________________________________________ Clear

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Ctrl-a to access these functions, ESC for previous menu M

ave

S

Fields on the Device Name screen are null until you enter values. Allowable
values are any printable ASCII character. ASCII printable characters include:

 Numeric 0–9
 Upper or lower case A–Z
 Space
 All ASCII symbols

Clear

ainMenu Exit

7510-A2-GB20-00

Use the left and right arrow keys to scroll through the fields. Select Clear to reset
a field to a null value.

March 1997

3-1

Customizing the DSU

 Procedure

To enter Device Name screen information:

1. Position the cursor in the Device Name field. Enter a name unique in your
system to identify the unit.

The maximum length of Device Name is 20 characters.

2. Position the cursor in the System Name field. Enter a name unique in your
network to identify the system.

The maximum length of System Name is 127 characters.

3. Position the cursor in the System Location field. Enter the physical location of
the system.

The maximum length of System Location is 127 characters.

4. Position the cursor in the System Contact field. Enter the name and contact
information for the person responsible for the unit.

The maximum length of System Contact is 127 characters.

5. Save the Device Name screen information as shown in the next section.

Saving Configuration Options

When changes are made to the configuration options, the changes must be
saved to take effect. Use the S

 Procedure

To save configuration options changes:

1. Press Ctrl-a to switch to the screen function key area below the dotted line.

2. Select S

NOTE:

When Exit is selected before Save, a Save Configuration screen appears
requiring a Yes or No response.

If you select . . .

Yes The configuration is saved.
No The Main Menu appears and changes are not saved.

ave key or Save Configuration screen.

ave and press Return.

Then . . .

3-2

March 1997

7510-A2-GB20-00

Configuring the DSU

Configuration option settings determine how the DSU operates. Use the DSU’s
Configuration branch to display or change configuration option settings.

Configuration Option Areas

The DSU is shipped with factory settings in the Default Factory configuration
area. You can find default information by:

Customizing the DSU

H Referring to

Appendix B.

H Accessing the Configuration branch of the DSU menu.

The DSU has two sets of configuration option settings. The Current Configuration
matches the Default Factory Configuration until modified and saved by the user.

Configuration Option Area

Current Configuration The DSU’s active set of configuration options.
Default Factory Configuration A read-only configuration area containing the factory

If the factory default settings do not support your network’s configuration,
customize the configuration options for your application.

Configuration Option Tables,

Configuration Option Set

default configuration options.

Accessing and Displaying Configuration Options

To display the configuration options, you must first copy one configuration option
set into the edit area.

Appendix A, or

Worksheets,

7510-A2-GB20-00

" Procedure

To load a configuration option set into the configuration edit area:

1. Follow this menu selection sequence:

Main Menu→Configuration (Load Configuration From)

2. Select Current Configuration or Default Factory Configuration. Press Return.
The selected configuration option set is loaded and the Configuration
Edit/Display menu screen appears.

See Appendix A for a list and explanation of the configuration options available.

March 1997

3-3

Monitoring the DSU

What to Monitor

This chapter presents information on how to access and monitor DSU status and
performance statistics on the DDS network. You can monitor DSU operations by
viewing:

 System and Test Status screen
 Highest priority Health and Status message on the last line of all screens

4

 Network Interface Status screen
 Network Performance Statistics screen
 LEDs on the ATI Status screen or the DSU’s front panel

Table 4-1 shows the available indicators of alarm conditions on the network
interface and the User Data port.

Table 4-1. Alarm Indicator Locations

Status

Alarm Condition

Crossed Pairs Y N
No Signal (NS) Y Y
Out of Service (OOS) Y Y
Out of Frame (OOF) Y Y
Excessive Bipolar Violations (BPV) Y N
Inband Framing Error Y N

Screen

Specific
LED

7510-A2-GB20-00

March 1997

4-1

Monitoring the DSU

Viewing System and Test Status

To view System and Test Status information, follow this menu selection
sequence:

Main Menu→Status→System and Test Status

The System and Test Status screen has three sections:

 Health and Status – Displays messages in priority order (highest to lowest).

Refer to Health and Status Messages, Table 4-2.

 Self-Test Results – Results of the Diagnostic test run on the device itself.

Refer to Self-Test Results Messages, Table 4-3.

 Test Status – Currently active tests. Refer to Test Status Messages,

Table 4-4.

main/status/system
Device Name: Node A Model: 7510

SYSTEM AND TEST STATUS

HEALTH AND STATUS SELF-TEST RESULTS TEST STATUS

Cross Pair Detection Device Fail No Test Active
No Signal
Out of Service
Out of Frame
Excessive BPVs
User Data Port DTR Off V.54-initiated DSU LB Active
Device Fail
DSU Operational Sending 511 on Port

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
ESC for previous menu M
R

efresh Clear

hhh:mm:ss

hhh:mm:ss

hhh:mm:ss

hhh:mm:ss

yyyyyyyy

Memory Fail CSU Loopback Active
Passed Network-init. CSU LB Active

DSU Loopback Active
Network-init. DSU LB Active

Local Loopback Active

Monitoring 511 on Port
Sending 511 on Network
Monitoring 511 on Network
Lamp Test Active

ainMenu Exit

4-2

March 1997

7510-A2-GB20-00

Health and Status

Monitoring the DSU

The following messages appear in the first column of the System and Test Status
screen. The highest priority Health and Status message also appears on all ATI
screens on the bottom right.

Table 4-2. Health and Status Messages (1 of 2)

Message

Cross Pair
Detection

No Signal

hhh:mm:ss

Out of Service

hhh:mm:ss

Out of Frame

hhh:mm:ss

1

1

1

What Message Indicates What To Do

The DDS Receive (RX) and
Transmit (TX) pairs are
crossed on the network
interface. Alarm LED is on.

No signal is being received.
Local DSU network problem.
The Alarm and NS LEDs are
on and Network Performance
Statistics are active.

DSU is receiving out of
service code from the
network for the remote unit.
The Alarm and OOS LEDs
are on and Network
Performance Statistics are
active.

DSU is detecting an out of
frame condition, associated
with:

 Receiving out of frame

code from the network.

 DSU detecting out of frame

errors with 64 kbps CC
data rate.

 DSU unable to synchronize

local receiver circuit with
line signal.

Reverse the RX and TX pair at the
punchdown block or other
termination point.

1. Verify that the network cable is
securely attached at both ends.

2. Contact network provider.

1. Verify that the remote site is in
service.

2. Contact network provider.

1. Verify that the line rate matches
the configured rate.

2. Contact network provider.

7510-A2-GB20-00

Excessive BPVs

hhh:mm:ss

User Data Port
DTR Off

1

hhh:mm:ss

and seconds. When the maximum time has been exceeded, 255:59:59+ appears.

1

Data rates do not match or
network trouble is causing
bipolar violations. Alarm LED
is on and Network
Performance Statistics are
active.

The DTE is not ready to
transmit or receive data. This
message will not appear
unless Monitor DTR is
enabled.

indicates the amount of time the condition has existed in hours, minutes,

March 1997

1. Verify that the network cable is
securely attached at both ends.

2. Contact network provider if
problem persists.

Check on the DTE status. Verify
that the DTE is powered up and
asserting DTR.

4-3

Monitoring the DSU

representative for assistance if

Table 4-2. Health and Status Messages (2 of 2)

Message What To DoWhat Message Indicates

Self-Test Results

Device Fail

yyyyyyyy

DSU Operational DSU is functioning properly

An internal error has been
detected by the operating
software.
the 8-digit hexadecimal failure
code.

and there are no status
messages to display.

yyyyyyyy

indicates

1. Provide the 8-digit failure code
shown (
representative.

2. Reset the DSU to clear the
condition and message.

No action needed.

yyyyyyyy

) to your service

The results of the last power-up or reset self-test appear in the middle column of
the System and Test Status screen.

Table 4-3. Self-Test Results Messages

Message

Device Fail One or more of the DSU’s integrated

Memory Fail DSU failed memory verification.

What Message Indicates What To Do

1. Reset the DSU and try again.
circuit chips has failed device-level
testing.

2. Call your service

representative for assistance if
the message reappears.

Passed The DSU has been plugged in or

reset and has passed the diagnostic
test. There are no other status
messages.

No action needed.

4-4

March 1997

7510-A2-GB20-00

Test Status Messages

Monitoring the DSU

The Test Status Messages in the following table appear in the rightmost column
of the System and Test Status screen.

Table 4-4. Test Status Messages
Test Status Message

No Test Active Status message, indicating no local, remote, or network test in

CSU Loopback Active A CSU Loopback toward the network is currently active.
Network-init. CSU LB

Active
DSU Loopback Active A DSU Loopback toward the network is currently active.
Network-init. DSU LB

Active

V.54-initiated DSU LB
Active

Local Loopback Active A local loopback toward the DTE is currently active.
Sending 511 on Port A 511 test pattern is being sent over the DTE port.

Meaning

progress.

A CSU Loopback initiated by the network is currently active.

A DSU Loopback initiated by the network is currently active.

 If the network service is 56 kbps, the network loopback is

non-latching. A non-latching loopback ends when the
network activation codes stop.

 If the network service is 64 kbps CC, the network loopback

is latching. This condition can only occur when the Network
Interface option Network-initiated DSU Loopback (64K CC)
is enabled. Refer to Network Interface Options, Table A-2.

A DSU loopback is active that was initiated by the detection of
a V.54 sequence originated by the remote unit. This condition
can only occur when V.54 Initiated DSU Loopback is enabled.
Refer to Network Interface Options, Table A-2.

7510-A2-GB20-00

Monitoring 511 on Port DSU is monitoring a 511 test pattern over the DTE port.
Sending 51 1 on

Network
Monitoring 51 1 on

Network
Lamp Test Active The Lamp Test is active, causing the LEDs on the front panel to

A 51 1 test pattern is being sent over the network interface.

DSU is monitoring a 51 1 test pattern on the network interface.

light.

March 1997

4-5

Monitoring the DSU

Viewing Network Interface Status

The network interface status fields are read-only:

 Line Rate (Kbps). If the DSU is connected to an operating line and the Line

Rate (Kbps) shows Autobaud and does not change to a line rate within about
15 seconds, Line Rate (Kbps) may have to be reconfigured manually. Refer
to Network Interface Options, Table A-2.

 Loop Loss (dB). The loop loss is the loss of signal strength of the receive line

signal from the local loop.

To view the Network Interface Status, follow this menu selection sequence:

Main Menu→Status→Network Interface Status

Table 4-5 describes the contents of the Network Interface Status screen.

Table 4-5. Network Interface Status Screen Contents

Field

Line Rate (Kbps) 56 Kbps

Loop Loss (dB)

Status What the Status Indicates

64 CC
64 LADS
Autobaud

No Signal No signal can be detected over the

0 to –65 dB Amount of loop loss – loss of signal

Inoperative The line may be disconnected.

Line rate on the network interface.
Autobaud indicates the DSU is
trying to determine the network line
rate. This should be a temporary
condition.

network interface.

strength of the receive line signal
from the local loop, measured in
decibels.

4-6

March 1997

7510-A2-GB20-00

Viewing Network Performance Statistics

Performance statistics for the network interface are available to:

 Monitor the current status of the network operations.
 View the DSU’s performance statistics, which:

— Assist you in determining the duration of specific conditions.
— Provide a historical context for problem detection and analysis.

To view the Network Performance Statistics, follow this menu selection sequence:

Main Menu→Status→Network Performance Statistics

main/status/performance
Device Name: Model: 7510

NETWORK PERFORMANCE STATISTICS

Monitoring the DSU

No Signal Count: 101920 26:33:08
Out of Service Count: 0 0:00:00
Out of Frame Count: 621 8:53:49
Excessive BPV Count: 99830 144:28:11
Invalid BPV Count: 87409

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

efresh ClrStats

R

ESC for previous menu M

ainMenu Exit

All counts show the number of occurrences since the last reset of the counters.

 No Signal Count is the number of occurrences of a No Signal condition.
 Out of Service Count is the number of occurrences of an Out of Service

(OOS) condition.

 Out of Frame Count is the number of occurrences of an Out of Frame

(OOF) condition.

 Excessive BPV Count is the number of times at least one invalid bipolar

violation was detected every 20 ms for a 2-second period.

 Invalid BPV Count is a raw count of the number of invalid bipolar violations.

7510-A2-GB20-00

In the last column,

hhh:mm:ss

indicates the amount of time the condition has
existed in hours, minutes, and seconds. When the maximum time has been
exceeded, 255:59:59+ appears.

The screen appears with the cursor in the function area below the dotted line. To
update the performance statistics, select R

Select C

lrStats and press Return to clear all statistics and refresh the screen.

March 1997

efresh and press Return.

4-7

Monitoring the DSU

Monitoring the LEDs

The status of DSU LEDs can be viewed on the Display LEDs Status screen.
The 12 LEDs are organized into three groups:

 System LEDs display the status of the unit
 Network LEDs display the status of the network interface
 Port LEDs display the activity on the user data (DTE) port

To view the LED status screen, follow this menu selection sequence:

Main Menu→Status→Display LEDs

main/status/leds
Device Name: Model: 7510

DISPLAY LEDS

SYSTEM NETWORK DTE

OK ALARM TEST DM OOS OOF NS TXD RXD RTS CTS DTR

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

efresh

R

ESC for previous menu M

ainMenu Exit

When viewed via the ATI, the status display screen is updated approximately
every 5 seconds. Use R

efresh to obtain a current status of all LEDs.

4-8

March 1997

7510-A2-GB20-00

System LEDs

Monitoring the DSU

OK:

ON – DSU is operational.
OFF – DSU is performing a power-up self-test, has detected a system

failure, or there is no power.

ALARM:

ON – DSU has detected an alarm condition locally or from

the network. Refer to the
Chapter 6.

TEST:

ON – Test in progress. Test can be initiated locally, remotely,

or from the network. Includes power-up self-test.

Troubleshooting

section in

7510-A2-GB20-00

March 1997

4-9

Monitoring the DSU

Network LEDs

DM – Data Mode:

ON – DSU (DDS network interface) is sending or

receiving data, or is in DMI condition
(all 1s being received).

OFF – DDS network interface is receiving CMI codes.

OOS – Out of Service:

ON – DSU is receiving out of

service code from the remote unit.
Refer to Health and Status Messages,
Table 4-2.

OOF – Out of Frame:

ON – DSU is detecting an out of frame

condition. Refer to Health and Status

Messages, Table 4-2.

NS – No Signal:

ON – DDS network interface detects

no signal. Refer to Health and

Status Messages, Table 4-2.

4-10

March 1997

7510-A2-GB20-00

Port LEDs

Monitoring the DSU

TXD – Transmitted Data:

ON – Receiving all 0s from the DTE.
OFF – Receiving all 1s from the DTE.
Blinking – User data is being transferred.

RXD – Received Data:

ON – Sending all 0s to the DTE.
OFF – Sending all 1s to the DTE.
Blinking – User data is being transferred.

RTS – Request to Send:

ON – DTE is activating a control signal to

indicate readiness to transmit data.

CTS – Clear to Send:

ON – DSU is activating a control signal to

indicate to the DTE that it can start
sending data.

DTR – Data Terminal Ready:

ON – DTE is activating a control signal to

indicate readiness for operation.

7510-A2-GB20-00

March 1997

4-11

Testing

Accessing the Test Menu

From the Test menu, you can run network tests, data port tests, and a lamp test
for the front panel LEDs.

To access the Test menu, follow this menu selection sequence:

Main Menu→Test

5

main/test
Device Name: Model: 7510

TEST

Network Tests
Data Port Tests
Lamp Test

Abort All Tests

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Ctrl-a to access these functions E

The DSU supports independent tests at the physical level.

 The CSU and DSU loopbacks and 511 test pattern send/monitor are

supported on the network interface.

xit

7510-A2-GB20-00

 The Local Loopback and 511 test pattern send/monitor are supported on the

DTE port.

March 1997

5-1

Testing

Loopbacks can be started from a variety of points in the network, as shown in
Table 5-1.

Table 5-1. Device Messages

Loopback T ype

Initiated By Notes

Bilateral Loopback  User

 Remote unit sending

V.54 sequence

CSU Loopback  User (Network tests)

 DDS Network, by

loop current reversal

DSU Loopback

 User Refer to Data Port Options, Table A-3.

(Digital)
Local Loopback  User

 DTE via CT141

Network-initiated

 DDS Network Cannot be disabled by user.

56 kbps DSU
Loopback (Non­latching loopback)

Network-initiated

 DDS Network Includes optional data scrambling and

64 kbps CC DSU
Loopback
(Latching loopback)

Remote Digital
Loopback

 Remote unit sending

V.54 sequence

When enabled, running a DSU loopback
also automatically starts a local
loopback. Refer to Data Port Options,
Table A-3, to enable.

When initiated by the network, CSU
Loopback cannot be disabled by the
user.

Control via CT141 can be disabled.
Refer to Data Port Options, Table A-3.

uses 25-second timer to detect the
network sequence. Can be disabled by
user.

Same as a DSU Loopback but initiated
by a remote unit via V.54 sequence.
Can be disabled locally . Refer to

Network Interface Options, Table A-2.

5-2

V.54 Sequences to
remote unit

 User
 DTE via CT140

March 1997

Control via CT140 can be disabled.
Refer to Data Port Options, Table A-3.

7510-A2-GB20-00

Running Network Tests

Network tests require the participation of your network service provider. To
access the Network Tests screen, follow this menu selection sequence:

Main Menu→Test→Network Tests

main/test/network
Device Name: Model: 7510

Test Command Status Result

CSU Loopback: Start Inactive 0:00:00
DSU Loopback: Start Inactive 0:00:00

Send V.54 Up: Send Sending
Send V.54 Down: Send Inactive

Send 511: Start Inactive 0:00:00
Monitor 511: Stop Active 125:08:48 Errors 99999+

Testing

NETWORK TESTS

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Ctrl-a to access these functions, ESC for previous menu M
R

esetMon

ainMenu Exit

Use the Command column to start or stop a test by pressing Enter. The Result
column displays the test duration since the last device reset. When the Monitor
511 test is active, R

esetMon is available to reset the error counter to zero.

7510-A2-GB20-00

March 1997

5-3

Testing

CSU or External Network Loopback

CSU loopback is an external loopback that is located as closely as possible to the
network interface.

 Procedure

To run a CSU loopback:

1. Position the cursor at the Start command next to CSU Loopback on the
Network Tests screen.

2. Press Enter.

3. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.

4. Press Enter. The duration of the test is displayed.

DSU CSU

DTE

Port

DTE

Interface

Aggregate

CSU Loopback

DDS
Network
Port

496-15144

5-4

March 1997

7510-A2-GB20-00

DSU or Internal Network Loopback

DSU loopback is an internal loopback that is located as closely as possible to the
customer interface serving the DTE.

" Procedure

To run a DSU loopback:

1. Position the cursor at the Start command next to DSU Loopback on the
Network Tests screen.

2. Press Enter.

3. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.

4. Press Enter. The duration of the test is displayed.

DTE

Port

Interface

DSU CSU

Aggregate

DTE

Testing

DDS
Network
Port

Send V.54 Up/Down Sequences

The local DSU can send an ITU-T V.54 Up or Down sequence to request the
activation or termination of a DSU (digital) loopback of a remote unit. This is the
same as the DSU Loopback shown above except the test is activated remotely.

The DSU can send:

H In-band V.54 Up (activation) code to request a Remote DSU Loopback

(V.54 Loop 2) at the remote DSU or

H In-band V.54 Down (deactivation) code to request the termination of a

Remote DSU Loopback (V.54 Loop 2) at the remote DSU

" Procedure

To start or stop a remote DSU loopback:

1. Position the cursor at the Send command next to Send V.54 Up or Send V.54
Down on the Network Tests screen.

2. Press Enter.
Sending appears in the Status column followed (after 3 seconds) by

Command Complete at the bottom of the screen.

DSU Loopback

496-15160

7510-A2-GB20-00

Refer to

Running Network Tests

March 1997

for an example of the Network Tests screen.

5-5

Testing

511 Test Pattern for the Network

This test sends or monitors the 511 test pattern over the network interface.

 Procedure

To run a Send 511 test:

1. Position the cursor at the Start command next to Send 511 on the Network
Tests screen.

2. Press Enter.

3. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.

4. Press Enter. The duration of the test is displayed.

 Procedure

To run a Monitor 511 test:

1. Position the cursor at the Start command next to Monitor 511 on the Network
Tests screen.

2. If desired, use Ctrl-a to switch to the screen function key area and use the
virtual function key r or R (R
Ctrl-a to return the cursor to the Start command.

3. Press Enter.

4. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.

5. Press Enter. The duration of the test is displayed.

Refer to

Running Network Tests

esetMon) to clear the error counter to zero. Press

for an example of the Network Tests screen.

5-6

March 1997

7510-A2-GB20-00

Running Data Port Tests

Testing

For an example of the fields on a test menu screen, refer to

. To access the Data Port Tests screen, follow this menu selection

Tests

Running Network

sequence:

Main Menu→Test→Data Port Tests

main/test/port
Device Name: Node A Model: 7510

DATA PORT TESTS

Test Command Status Result

Local Loopback: Start Inactive 000:00:00

Send 511: Start Inactive 000:00:00
Monitor 511: Stop Active 255:59:59+ – Errors 99999+

–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Ctrl–a to access these functions, ESC for previous menu MainMenu Exit
ResetMon

7510-A2-GB20-00

March 1997

5-7

Testing

Local Loopback

Local Loopback loops the user data back to the DTE. This loopback is located as
closely as possible to the User Data Port (DTE) interface.

 Procedure

To run a local loopback:

1. Position the cursor at the Start command next to Local Loopback on the Data
Port Tests screen.

2. Press Enter.

3. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.

4. Press Enter. The duration of the test is displayed.

DSU CSU

DTE

Port

511 Test Pattern for the DTE

This test sends or monitors a 511 test pattern over the User Data Port interface.

 Procedure

To run a Send 511 test:

1. Position the cursor at the Start command next to Send 511 on the Data Port
Tests screen.

2. Press Enter.

3. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.

4. Press Enter. The duration of the test is displayed.

DTE

Interface

Aggregate

Local Loopback

DDS
Network
Port

496-15145

5-8

March 1997

7510-A2-GB20-00

 Procedure

To run a Monitor 511 test:

1. Position the cursor at the Start command next to Monitor 511 on the Data
Port Tests screen.

2. If desired, use Ctrl-a to switch to the screen function key area and use the
virtual function key r or R (R
Ctrl-a to return the cursor to the Start command.

3. Press Enter.

4. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.

5. Press Enter. The duration of the test is displayed.

The 511 monitor expects the external equipment to provide the clock for the
511 pattern on the interchange circuit CT113 (TT), for timing the incoming pattern.
Refer to

V.35 User Data Port Connector

esetMon) to clear the error counter to zero. Press

in Appendix C.

Testing

Running the Lamp Test

The DSU supports a Lamp test from the Test menu to determine whether all
LEDs light up.

During the Lamp test, all LEDs blink simultaneously once per second. When you
stop the Lamp test, the LEDs are restored to their normal condition.

To access the Data Port Tests screen, follow this menu selection sequence:

Main Menu→Test→Lamp Test

 Procedure

To run a Lamp test:

1. Position the cursor at the Start command next to Lamp Test on the Lamp Test
screen.

2. Press Enter.

3. The Start command is changed to Stop. When you want to stop the test,
verify that the cursor is positioned at the Stop command.

4. Press Enter.

7510-A2-GB20-00

March 1997

5-9

Testing

Ending an Active Test

A test initiated by the user can be ended by the user.

 A Test Timeout option is available to automatically terminate a user-initiated

Loopback or Pattern test after it has been running a specified period of time.
Refer to System Options, Table A-1.

Test Timeout does not pertain to tests commanded by the:

— Network, such as the network-initiated CSU and DSU Loopbacks.
— DTE, such as the DTE-initiated Local Loopback.

 On each test screen is a command column. Pressing Return when the cursor

is on the Stop command stops the test.

 Use the Abort All Tests selection from the Test menu to stop all tests running

on all interfaces, with the exception of network or DTE-initiated loopbacks.
Command Complete appears when all tests on all interfaces have been
terminated.

5-10

March 1997

7510-A2-GB20-00

Messages and Troubleshooting

Messages and Troubleshooting

There are many messages available to assess the status of the device and
contribute to problem resolutions. Refer to the following sections:



Responding to Device Messages



Troubleshooting

6

Responding to Device Messages

The Device Messages in Table 6-1, listed in alphabetical order, may appear in the
messages area at the bottom of the ATI screens.

Table 6-1. Device Messages (1 of 2)

Device Message

Command Complete Action requested has

Invalid Character

Invalid – Network
Initiated CSU (or DSU)
Loopback Active

Invalid – [Test]
Already Active

x

What Message Indicates What To Do

No action needed.

successfully completed.
A nonprintable ASCII

character has been
entered.

Network-initiated loopback
was in progress when
another selection was
made.

[Test] can be a CSU, DSU,
or DTE Local Loopback, or
a Send 51 1 or Monitor 511.
The [test] was already in
progress when another
selection was made.

Reenter information using valid
characters.

No action needed.

 Allow test to continue.
 Select another test.
 Stop the test.

7510-A2-GB20-00

March 1997

6-1

Messages and Troubleshooting

Table 6-1. Device Messages (2 of 2)

Device Message What To DoWhat Message Indicates

Invalid Test
Combination

A loopback or 51 1 pattern
test was in progress when
Start was selected to start
another test, or was active
on the same or another
interface when Start was
selected.

Please Wait Command takes longer

than 5 seconds.

Test Active A test is running and no

higher priority health and
status messages exist.

 Wait until other test ends and

message clears.

 Abort all tests from the Test

menu screen.

 Stop the test from the same

screen the test was started
from.

Wait until message clears.

 Contact service provider if test

initiated by the network.

 Wait until the other test ends

and message clears.

 Cancel all tests from the Test

screen.

 Stop the test from the same

screen the test was started
from.

6-2

March 1997

7510-A2-GB20-00

Troubleshooting

Messages and Troubleshooting

This DSU is designed to provide you with many years of trouble-free service. If a
problem occurs, however, refer to Table 6-2 for possible solutions.

Table 6-2. Troubleshooting (1 of 2)

Symptom

Alarm LED is on. One of several alarm

Cannot access the
DSU via the ATI.

Device Fail appears
on the System and
Test Status screen
under Self-Test
results.

An LED is not lit. LED is burned out. Run the Lamp test. If the LED in

No power, or the
LEDs are not lit.

Possible Cause Solutions

Refer to Health and Status
conditions exists. Health
and Status displays the
alarm condition.

The terminal is not set up
for the correct rate or data
format, or the DSU is
configured so it prevents
access.

The DSU detects an
internal hardware failure.

The power cord is not
securely plugged into the
wall receptacle and into the
rear panel connection.

Messages, Table 4-2, for

recommended action.

1. Check the cable and
connections.

2. Set up your terminal or PC
emulation as shown in

Connecting to the Terminal Port

in Chapter 2.

3. Power the DSU on and off and
try again.

 Power the DSU off and on and

try again.

 Contact your service

representative.

question does not flash with the
other LEDs, then contact your
service representative.

Check that the power cord is
securely attached at both ends.

7510-A2-GB20-00

The wall receptacle has no
power.

Power supply has failed. Replace power supply.

March 1997

 Check the wall receptacle power

by plugging in some equipment
that is known to be working.

 Check the circuit breaker.
 Verify that your site is not on an

energy management program.

6-3

Messages and Troubleshooting

in Appendix D

Model 7510

Table 6-2. Troubleshooting (2 of 2)

Symptom SolutionsPossible Cause

Not receiving data;
DSU is not
responding.

Power-Up Self-Test
fails. Only Alarm
LED is on after
power-up.

 DDS line rate/speed has

changed.

 Excessive BPVs causing

DSU to become stuck in
Autobaud mode.

 Excessive Loop Loss

causing DSU to become
stuck in Autobaud mode.

The DSU has detected an
internal hardware failure.

1. Verify that your subscriber loop is
running at 56 or 64 CC kbps.

2. If getting Excessive BPVs, verify
that you do not have a bad cable.
If the cable is good, contact the
network provider.

3. If getting excessive Loop Loss
(dB) indications, install a higher
quality cable. Refer to

in Appendix D,

DSU LADS Connection
Distances.

4. If the DDS Line Rate (Kbps) field
shows Autobaud, the DSU may
be stuck in Autobaud mode.
Configure Line Rate (Kbps) for
56 or 64 kbps.

5. Run Loopback tests. Refer to

Running Network Tests

Chapter 5.

 Reset the DSU and try again.
 Contact your service

representative.

Table D-2

Model 7510

,

in of

Resetting the DSU

The DSU can be reset locally or remotely.
To reset the DSU, follow this menu selection sequence:

Main Menu→Control→Reset Device

The DSU reinitializes itself, performing a Device Self-Test. Refer to Self-Test

Results Messages, Table 4-3.

Displaying DSU Identity Information

To display the DSU’s system name, location, contact, serial number, model
number, and software and hardware revision numbers, follow this menu selection
sequence:

Main Menu→Status→Identity

6-4

March 1997

7510-A2-GB20-00

Configuration Option Tables

Overview

The tables in this appendix summarize the configuration options accessed when
you select Configuration on the Main Menu. The configuration options are
arranged into groups based upon functionality.

A

Select . . .

System System Options, Table A-1 General system

Network Network Interface Options, Table A-2 DDS network interface
Data Port Data Port Options, Table A-3 User data on DTE port
Terminal Port Terminal Port Options, Table A-4 ATI

NOTE:

All changes to configuration options must be saved. Refer to

Configuration Options

MAIN MENU
Status
Test
Configuration
Control

To Access the . . . To Configure the . . .

options

Saving

in Chapter 3.

Configuration

Load
Configuration
From ...

Edit/Display

• System

• Network

• Data Port

• Terminal Port

497-15239

7510-A2-GB20-00

March 1997

A-1

Configuration Option Tables

System Options Menu

For System Options, refer to Table A-1. To access the System Options screen,
follow this menu selection sequence:

Main Menu→Configuration (Load Configuration From)

→

Configuration Edit/Display→System

Table A-1. System Options (1 of 2)

Operating Mode

Possible Settings: DDS, LADS
Default Setting: DDS

The unit’s operating mode depends upon the DSU’s application.
DDS – Standard DDS network operation. The operating rate is either 56 kbps or

64 kbps CC.
LADS – The Local Area Data Set operating mode requires that the local and remote

units are connected directly to each other. This is a point-to-point application; also
known as LDM.

DDS Line Rate (Kbps)

Possible Settings: 56, 64CC, Autobaud
Default Setting: Autobaud

The unit starts up with Autobaud. When the DDS line rate obtained from the service
provider is detected, Autobaud is replaced with the actual rate.

 DDS Line Rate (Kbps) option appears when Operating Mode is set to DDS.

NOTE: Setting the actual data rate will result in minimum power-up time.

56 – 56 kbps line rate.
64CC – 64 kbps Clear Channel on a 72 kbps circuit.
Autobaud – This setting is automatically changed to the actual operating line rate of

56 kbps or 64CC as soon as the signal is detected.

LADS Timing

Configuring the actual data rate is recommended after initial installation.

A-2

Possible Settings: Internal, External, Receive
Default Setting: Receive

Determines the timing source for the unit.

 LADS Timing option appears when Operating Mode is set to LADS.

Internal – Timing derived from the unit’s local clock. Use this setting for the LADS
primary timing unit that establishes the timing for both point-to-point units.

External – Timing is derived from the external clock provided by the DTE connected to
the V.35 interface on circuit CT113 (pins U, W).

Receive – Timing is derived from the line receive signal unless the unit is running
diagnostic tests. During the tests, the timing source is the internal clock. This setting
should be used for a LADS secondary timing unit.

7510-A2-GB20-00March 1997

Configuration Option Tables

Table A-1. System Options (2 of 2)

LADS Line Rate (Kbps)

Possible Settings: 56, 64
Default Setting: 64

Line operating rate for LADS operation.

 LADS Line Rate (Kbps) option appears when Operating Mode is set to LADS.

56 – 56 kbps line rate. Provides increased distance for the LADS applications.
64 – 64 kbps line rate.

T est Timeout

Possible Settings: Enable, Disable
Default Setting: Enable

Allows user-initiated tests to end automatically . Recommend enabling when the unit is
managed remotely through the IMC to avoid the requirement to terminate the test
manually.

Enable – User-initiated loopback and pattern tests end when test duration is reached.
Disable – Tests must be terminated manually from the Network Tests screen. Refer to

Running Network Tests

NOTE: Tests commanded by the DTE or network-initiated tests are not affected by

this test timeout.

Test Duration (min)

in Chapter 5.

Possible Settings: 1–120
Default Setting: 10

Number of minutes for a test to be active before automatically ending.

 Test Duration (min) option appears when Test Timeout is enabled.

1 to 120 – Amount of time in minutes for a user-initiated test to run before terminating.

7510-A2-GB20-00

March 1997

A-3

Configuration Option Tables

Network Interface Options Menu

For Network Interface Options, refer to Table A-2. To access the Network
Interface Options screen, follow this menu selection sequence:

Main Menu→Configuration (Load Configuration From)

→

Configuration Edit/Display→Network

Table A-2. Network Interface Options

Network-initiated DSU Loopback (64K CC)

Possible Settings: Enable, Disable
Default Setting: Enable

Indicates whether the access unit responds to a DSU latching loopback sequence sent
by the network as specified by TR62310.

 Network-initiated DSU Loopback (64K CC) option appears when Operating Mode

is set to DDS in Table A-1.

Enable – Responds to network-initiated commands to start and stop a latching DSU
loopback.

Disable – DSU will not respond to a DSU loopback initiated by the network.
Data Scrambling (64K CC)

Possible Settings: Enable, Disable
Default Setting: Disable

Data scrambling is used to suppress the possible simulation of network-initiated DSU
latching loopback commands by application data.

 Data Scrambling (64K CC) option appears when Operating Mode is set to DDS in

Table A-1.

Enable – Enables data scrambling. The local and remote units must be set the same.
Disable – No data scrambling.

A-4

V.54 Initiated DSU Loopback

Possible Settings: Enable, Disable
Default Setting: Disable

When enabled, user data is looped back to the network when a V.54 Loop Up sequence
is received. The DSU loopback ends when a V.54 Loop Down sequence is detected.

Enable – DSU loopback can be initiated or terminated by a remote unit sending in-band
V.54 Loop 2 Up or Down sequences.

Disable – V.54 Loop 2 sequences are ignored.

7510-A2-GB20-00March 1997

Data Port Options Menu

For Data Port Options, refer to Table A-3. To access the Data Port Options
screen, follow this menu selection sequence:

Configuration Option Tables

Main Menu→Configuration (Load Configuration From)

→

Configuration Edit/Display→Data Port

Table A-3. Data Port Options (1 of 3)

Invert Transmit Clock

Possible Settings: Enable, Disable
Default Setting: Disable

The DSU clock provided on Interchange Circuit CT114, Transmit Signal Element Timing
DCE source (TXC), is phase inverted with respect to Interchange Circuit CT103,
Transmitted Data (TXD). Recommended when data errors are occurring due to long
cable lengths.

Enable – The DSU-supplied clock is phase inverted with respect to the transmitted data
TXD.

Disable – The clock supplied by the DSU on TXC is normal (i.e., not inverted).
Port (DTE) Initiated Loopbacks

Possible Settings: Disable, Local, Remote, Both
Default Setting: Disable

Specifies whether the DTE can initiate and terminate local and/or remote loopbacks.
The DTE loopback control is done through the Interchange Circuits specified by the
V.54 standard.

NOTE: Refer to

Disable – No local or remote loopbacks can be initiated by the DTE.
Local – A local loopback can be controlled by the DTE, via the Interchange Circuit LL

(CT141), as specified by V.54. The DTE port remains in loopback as along as LL
remains on. Aborting the loopback from the A TI has no effect.

Remote – A remote digital loopback can be controlled by the DTE, via Interchange
Circuit RL (CT140), as specified by V.54. The remote equipment must be able to detect
the in-band V.54 loopback sequence.

Both – Both the local and remote loopbacks can be controlled by the DTE.

Running Network Tests

in Chapter 5.

7510-A2-GB20-00

Bilateral Loopback

Possible Settings: Enable, Disable
Default Setting: Disable

When a DSU loopback is initiated, a local DTE loopback is also automatically initiated.
A Bilateral Loopback can be started by the A TI/NMS or by detection of a V.54 Loop 2 Up
sequence.

Enable – When Bilateral Loopback is enabled, running a DSU loopback also
automatically starts a local loopback. The local loopback ends when the DSU loopback
terminates.

Disable – Running a DSU loopback does not start a local loopback.

NOTE: Refer to

Running Network Tests

March 1997

in Chapter 5.

A-5

Configuration Option Tables

Table A-3. Data Port Options (2 of 3)

Carrier Control by RTS

Possible Settings: Constant, Switched
Default Setting: Constant

Simulates Constant or Switched Carrier operation.
Constant – The internal RTS is forced on and the DSU is in a constant Data Mode on

the transmit line. The external RTS lead is ignored. The actual signal on the line is either
all ones (DMI) or DTE transmitted data.

Switched – RTS is monitored and CMI codes are transmitted when RTS is off.
CTS Control

Possible Settings: Standard, Follow RTS, Forced On, Circuit Assurance
Default Setting: Standard

Specifies the operation of the Interchange Circuit CT106, Clear to Send (CTS), which is
an output from the DSU.

Standard – CTS follows the internal RTS with a fixed delay, except that CTS will be off
when a network interface related alarm is detected or a test is active. The active test
may be initiated locally , remotely, or by the network.

Follow RTS – CTS follows the external RTS lead without delay, regardless of alarms
and tests.

Forced On – CTS is always forced on after the unit is powered up with a successful
self-test.

Circuit Assurance – With circuit assurance, CTS operates the same as the Standard
option, except that CTS will also be deasserted when CMI codes are being received.

RLSD Control

Possible Settings: Standard, Forced On
Default Setting: Standard

Specifies the operation of the Interchange Circuit CT109, Received Line Signal Detector
(RLSD or CD), which is an output from the DSU.

Standard – RLSD is asserted when Data Mode is on the receive line. RLSD deasserts
when a DDS facility alarm is detected or the DSU is receiving CMI codes.

Forced On – RLSD is forced on after the unit is powered up with a successful self-test.
DSR Control

Possible Settings: Standard, Forced On, On During Test
Default Setting: Standard

Specifies the operation of the Interchange Circuit CT107, Data Set Ready (DSR), which
is an output from the DSU.

Standard – DSR is always asserted, except when a DDS facility alarm is reported or
the DSU is in Test mode.

Forced On – DSR is forced on after the unit is powered up with a successful self-test.
On During Test – DSU operates the same as the Standard option, except that DSR

remains asserted when the DSU is in Test mode to allow the DTE to send test patterns.

A-6

7510-A2-GB20-00March 1997

Table A-3. Data Port Options (3 of 3)

Monitor DTR

Possible Settings: Enable, Disable
Default Setting: Enable

Indicates to the DSU whether to monitor the Interchange Circuit CT108, Data Terminal
Ready (DTR), from the DTE.

Enable – The DSU monitors the state of DTR on the DTE port and displays it on the
System and Test Status screen.

Disable – DTR is not monitored by the DSU. Use when a DTE does not provide the
DTR lead at the interface.

Terminal Port Options

For Terminal Port options, refer to Table A-4. To access the Terminal Port Options
screen, follow this menu selection sequence:

Configuration Option Tables

Main Menu→Configuration (Load Configuration From)

→

Configuration Edit/Display→Terminal Port

Table A-4. Terminal Port Options (1 of 2)

Monitor DTR

Possible Settings: Enable, Disable
Default Setting: Enable

Specifies monitoring of the Data Terminal Ready (DTR) control lead.

Enable – Standard operation of the DTR control lead.
Disable – DTR is ignored. Some external device connections may require this setting.
Inactivity Timeout

Possible Settings: Enable, Disable
Default Setting: Disable

Provides automatic logoff of an ATI session through the Terminal Port. When the
session is closed, User Interface Idle appears on the screen and the unit toggles the
Terminal port DSR lead.

Enable – The ATI session terminates automatically after the Disconnect Time set in the
next option. When the session was occurring over an external modem connected to the
Terminal port, the modem will interpret the DSR toggle as DTR being dropped and
disconnect.

Disable – An A TI session through the Terminal port will remain active indefinitely.

7510-A2-GB20-00

March 1997

A-7

Configuration Option Tables

Table A-4. Terminal Port Options (2 of 2)

Disconnect Time(minutes)

Possible Settings: range 1 – 60
Default Setting: 5

Number of minutes of inactivity before the A TI session terminates automatically.
Timeout is based on no keyboard activity.

1 to 60 – The ATI user session is closed after the selected number of minutes.

 Disconnect Time(minutes) option appears when Inactivity Timeout is enabled.

A-8

7510-A2-GB20-00March 1997

Worksheets

Overview

The worksheets in this appendix summarize the configuration options accessed
when you select Configuration on the Main Menu. The possible menu selections
are displayed with the default settings and the possible settings.

Configuration Worksheets

B

System

Configuration Option Settings

Operating Mode [DDS], LADS
DDS Line Rate (Kbps) 56, 64CC, [Autobaud]
LADS Timing Internal, External, [Receive]
LADS Line Rate (Kbps) 56, [64]
Test Timeout [Enable], Disable
Test Duration (min) 1–120, [10]

Default in [Bold]

7510-A2-GB20-00

March 1997

B-1

Worksheets

Network Interface

Configuration Option Settings

Network-initiated DSU Loopback (64K CC) [Enable], Disable
Data Scrambling (64K CC) Enable, [Disable]
V.54 Initiated DSU Loopback Enable, [Disable]

Default in [Bold]

Data Port

Configuration Option Settings

Invert Transmit Clock Enable, [Disable]
Port (DTE) Initiated Loopbacks [Disable], Local, Remote, Both
Bilateral Loopback Enable, [Disable]
Carrier Control by RTS [Constant], Switched
CTS Control [Standard], Follow RTS, Forced On,

Circuit Assurance
RLSD Control [Standard], Forced On
DSR Control [Standard], Forced On, On During Test

Default in [Bold]

Monitor DTR [Enable], Disable

Terminal Port

Configuration Option Settings

Monitor DTR [Enable], Disable
Inactivity Timeout Enable, [Disable]
Disconnect Time(minutes) range 1 – 60 [5]

Default in [Bold]

B-2

7510-A2-GB20-00March 1997

Cables and Pin Assignments

Overview

The following sections provide pin assignments for the:

 Terminal Port EIA-232 Connector
 V.35 User Data Port Connector
 Standard EIA-232-D Crossover Cable
 LAN Adapter Converter and Cable

C

 Modular RJ48S DDS Network Interface Cable

7510-A2-GB20-00

March 1997

C-1

Cables and Pin Assignments

Terminal Port EIA-232 Connector

The Terminal port connects to a PC or VT100-compatible terminal.

Signal

Transmit Data (TXD) To DSU (In) 2
Received Data (RXD) From DSU (Out) 3
Request to Send (RTS) To DSU (In) 4
Clear to Send (CTS) From DSU (Out) 5
Data Set Ready (DSR) From DSU (Out) 6
Signal Ground (SG) — 7
Carrier Detect (CD) From DSU (Out) 8
Data Terminal Ready (DTR) To DSU (In) 20

Direction Pin #

C-2

7510-A2-GB20-00March 1997

V.35 User Data Port Connector

The following table provides the pin assignments for the 34-position
V.35 connector to the User Data terminal equipment.

Signal

Signal Ground/Common 102 — B
Request to Send (RTS) 105 To DSU (In) C
Clear to Send (CTS) 106 From DSU (Out) D
Data Set Ready (DSR) 107 From DSU (Out) E

ITU
CT#

Cables and Pin Assignments

Direction

34-Pin
Socket
Connector

Received Line Signal Detector
(RLSD or LSD)

Data Terminal Ready (DTR) 108/1, /2 To DSU (In) H
Remote Loopback (RL) 140 To DSU (In) N
Local Loopback (LL) 141 To DSU (In) L
Transmitted Data (TXD) 103 To DSU (In) P (A)

Received Data (RXD) 104 From DSU (Out) R (A)

Transmitter Signal Element Timing –
DTE Source (XTXC or TT)

Receiver Signal Element Timing –
DCE Source (RXC)

Transmitter Signal Element Timing –
DCE Source (TXC)

Test Mode Indicator (TM) 142 From DSU (Out) NN

109 From DSU (Out) F

S (B)

T (B)

113 To DSU (In) U (A)

W (B)

115 From DSU (Out) V (A)

X (B)

114 From DSU (Out) Y (A)

AA (B)

7510-A2-GB20-00

March 1997

C-3

Cables and Pin Assignments

Standard EIA-232-D Crossover Cable

A standard crossover cable can be used to connect the Terminal port to an
external modem.

Pin 14

Pin 1

Pin 13

Pin 25

Chassis Ground

Signal Ground

CD (RLSD)

P1

TXD

RXD

RTS

DSR

RXC

DTR

XTXC

P1

Plug

Pin

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

P2

Plug

Pin P2

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

Pin 14

Pin 25

Chassis Ground
TXD
RXD
RTS

DSR
Signal Ground
CD (RLSD)

RXC

DTR

XTXC

Pin 1

Pin 13

C-4

97-15180-01

7510-A2-GB20-00March 1997

LAN Adapter Converter and Cable

9

The following figure shows the:

 Pin assignments for the DB25 plug to modular jack converter between the

Management port and the 8-conductor LAN Adapter cable and

 Pin assignments for the custom 8-conductor cable (with modular plugs on

both ends) between the converter and the LAN Adapter.

Cables and Pin Assignments

Plug-to-Modular

Jack Converter

1
2
3
4
5
6
7
8

Plug to
Modular Jack

1
2
3
4
5
6
7
8

Management

Port (DB25 Plug)

Tx Clock

Rx Data

Signal Ground

Tx Data

DTR

CD

RTS

Rx Clock

8-Position

Modular Jack

15

3
7
2

20

8
4

17

Modular RJ48S DDS Network Interface Cable

Network access is via a 14-foot modular cable with an RJ48S keyed plug
connector on each end.

Cable

Plug to
LAN Adapter

1
2
3
4
5
6
7
8

Unused
DTR
Tx Data
Signal Ground
Rx Data
CTS
Frame Ground
Unused

496-1517

7510-A2-GB20-00

RJ48S DDS Network
Interface Cable Functions

Transmitted data to the local loop R 1
Transmitted data to the local loop T 2
Received data from the local loop T1 7
Received data from the local loop R1 8

March 1997

Circuit Pin #

C-5

Technical Specifications

Table D-1. Model 7510 DSU Technical Specifications (1 of 2)

D

Item

Housing

Height (including feet)
Height (without feet)
Width
Depth (case)
Depth (case and connectors)

Weight 1.3 pounds (0.6 kg)
Power

Normal service voltage
range

Approvals

FCC Part 15
FCC Part 68
Safety Certifications
Emissions

Interface and Connectors

25-pin D-subminiature
connector

34-pin MS34 connector

Specifications

2.13 inches (54.1 mm)

1.99 inches (50.6 mm)

9.10 inches (231.2 mm)

6.20 inches (157.5 mm)

6.51 inches (165.3 mm)

Input: 120 Vac +12 Vac, 60 Hz +3 Hz

4.9 watts (max.) at 120 Vac

Class A digital device
Refer to the equipment’s label for Registration Number.
Refer to the equipment’s label for approvals on product.
Class A digital apparatus

EIA-232/ ITU V.24 (ISO 2110) for Terminal Port

ITU V.35 (ISO 2593) for DTE Port

7510-A2-GB20-00

Physical Environment

Operating Temperature
Storage Temperature
Relative Humidity
Shock and Vibration

Heat Dissipation 11.6 Btu/hr. (max.) at 120 Vac

32° to 122° F (0° to 50° C)
–4° to 158 ° F (–20 ° to 70 ° C)
5%—95% (noncondensing)
Withstands normal shipping and handling

March 1997

D-1

Technical Specifications

Table D-1. Model 7510 DSU Technical Specifications (2 of 2)

Item Specifications

Network Interface

Data rates
LADS data rates
Services supported

Network Compatibility

ANSI T1.410-1992 and
AT&T Technical Reference
62310-1993

DTE Data Port Interface 34-pin V.35 connector

56 kbps and 64 kbps clear channel (CC)
56 kbps and 64 kbps
4-wire service

56 and 64 kbps meeting desired loop loss

Table D-2. Model 7510 DSU LADS Connection Distances

Wire Diameter (AWG)
19 Gauge

Data Rate
(kbps)

56 10.84 mi

64 10.69 mi

(.0359 or
.9122 mm)

(17.45 km)

(17.2 km)

22 Gauge
(.0253 or
.643 mm)

6.4 mi
(10.3 km)

6.06 mi
(9.76 km)

24 Gauge
(.0201 or
.511 mm)

4.50 mi
(7.24 km)

4.47 mi
(7.2 km)

26 Gauge
(.0159 or
.404 mm)

3.34 mi
(5.37 km)

3.20 mi
(5.15 km)

D-2

7510-A2-GB20-00March 1997

Glossary

aggregate
ASCII

ASCII Terminal or
Printer

asynchronous

AT Command Set

ATI

autobaud mode

AUX port
BPV
CCA
CCITT
CD

A single bit stream that combines two or more bit streams.
American Standard Code for Information Interchange. A 7-bit code that establishes

compatibility between data services. ASCII is the standard for data transmission over
telephone lines.

Devices that can be attached, either locally or remotely , to display or print the DSU’s alarm
messages.

A data transmission that is synchronized by a transmission start bit at the beginning of
a character (five to eight bits) and one or more stop bits at the end.

Attention Command Set. A group of commands, issued from an asynchronous DTE, that
allows control of the modem while in Command mode. All commands must begin with the
characters AT and end with a carriage return.

Asynchronous terminal interface. This feature allows a device to be controlled from an
async (asynchronous) terminal like an ASCII (VT100-compatible) terminal.

An operational mode in which the DSU forces automatic setting of the DDS line rate/speed
(56 or 64 kbps) as soon as a valid DDS network signal is detected.

The auxiliary communications port on a router.
Bipolar Violation. A modified bipolar signaling method in which a control code is inserted.
Circuit Card Assembly. A printed circuit board to which separate components are attached.
Consultative Committee on International Telegraphy and T elephony. See ITU.
Carrier Detect. A signal indicating that energy exists on the transmission circuit.

Associated with Pin 8 on an EIA-232 interface.

channel
CMI

COM port

configuration option
CPE

CSU

CTS

DCE

DDS

7510-A2-GB20-00

An independent data path.
Control Mode Idle. A control signal sent over the DDS line to indicate that no data is being

sent.
Communications port. A computer’s serial communications port used to transmit to and

receive data from a DCE. The DCE connects directly to this port.
Device software that sets specific operating parameters for the DSU.
Customer Premises Equipment. Terminating equipment supplied by either the customer or

some other supplier that is connected to the telecommunications network (e.g., DSUs,
terminals, phones, routers, modems).

Channel Service Unit. The function of the DSU that protects the T1 line from damage and
regenerates the T1 signal.

Clear to Send. An EIA-lead standard for V.24 circuit CT 106; an output signal
(DCE-to-DTE).

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.

Digital Data Service. Provides digital communication circuits.

March 1997

GL-1

Glossary

DMI

DSR

DSU

DTE

DTR

EIA

EIA-232
excessive BPV

factory defaults
FCC

frame relay

Data Mode Idle. Refers to a sequence of ones transmitted or received on the DDS
network.

Data Set Ready . An EIA-lead standard for V.24 circuit CT 107; an output signal
(DCE-to-DTE).

Data Service Unit. Data communications equipment that provides an interface between the
DTE and the digital network.

Data Terminal Equipment. The equipment, such as computers and printers, that provides
or creates data.

Data Terminal Ready. An EIA-lead standard for V.24 circuit CT 108; an input signal
(DTE-to-DCE).

Electronic Industries Association. This organization provides standards for the data
communications industry to ensure uniformity of interface between DTEs and DCEs.

The EIA ’s standards defining the 25-pin interface between the DTE and DCE.
An excessive bipolar violation condition results when at least one invalid bipolar violation

has occurred every 20 milliseconds for 2 seconds.
A predetermined set of configuration options for general operation.
Federal Communications Commission. Board of Commissioners that regulates all U.S.

interstate, intrastate, and foreign electrical communication systems that originate from the
United States.

A switching interface that is designed to get frames from one part of the network to another
as quickly as possible.

full-duplex
HDLC

interface
ITU

LADS

LAN

latching loopback

LED

link layer protocol
LL

loopback

LSD

The capability to transmit in two directions simultaneously .
High-Level Data Link Control. A communications protocol defined by the International

Standards Organization (ISO).
A shared boundary between functional units.
International Telecommunication Union, formerly known as CCITT. An advisory committee

established by the United Nations to recommend communications standards and policies.
Local Area Data Set is used to provide a point-to-point link between two devices (also

called LDM – limited distance modem).
Local Area Network. A network designed to connect devices over short distances, like

within a building.
A latching loopback can only be initiated or terminated by the 64 kbps clear channel

network service provider.
Light Emitting Diode. A status indicator that responds to the presence of a certain

conditions.
The protocol that regulates the communication between two network nodes.
Local Loopback. An EIA-lead standard for V.24 circuit CT 141; an input signal

(DTE-to-DCE).
Used to test various portions of a data link in order to isolate an equipment or data line

problem. A diagnostic procedure that sends a test message back to its origination point.
Line Signal Detect. An EIA-lead standard for V.24 circuit CT 109; an output signal

(DCE-to-DTE).

GL-2

March 1997

7510-A2-GB20-00

Glossary

multiplexing

node
non-latching

loopback
NS

OOF

OOS
PAD
point-to-point circuit
protocol

PSTN

reset
RIP
RLSD

A method for interleaving several access channels onto a single circuit for transmission
over the network.

A connection or switching point on the network.
A non-latching loopback can only be initiated or terminated by the 56 kbps network service

provider.
No Signal. A network-reported condition.
Out Of Frame. An error condition in which frame synchronization bits are in error. A

network-reported condition.
Out of Service. A digital network trouble signal.
Packet Assembler/Disassembler.
A data network circuit with one control and one tributary device.
The rules that govern how devices exchange information on a network. It covers timing,

format, error control, and flow control during data transmission.
Public Switched Telephone Network. A network shared among many users who can use

telephones to establish connections between two points.
A reinitialization of the device that occurs at power-up or in response to a reset command.
Routing Information Protocol. Specifies the routing protocol used between DSUs.
Receive Line Signal Detect. See CD.

router

RS-232
RTS

RXC

RXD

SDLC
synchronous

TDM

TM
TXC

TXD

A device that makes decisions about the paths network traffic should take and forwards
that traffic to its destination. A router helps achieve interoperability and connectivity
between different vendor’s equipment, regardless of protocols used.

An EIA standard for the 25-pin DCE/DTE interface. Same as EIA-232.
Request to Send. An EIA-lead standard for V.24 circuit CT 105; an input signal

(DTE-to-DCE).
Received Clock. An EIA-lead standard for V.24 circuit CT 115; an output signal

(DCE-to-DTE).
Received Data. An EIA-lead standard for V.24 circuit CT 104; an output signal

(DCE-to-DTE).
Synchronous Data Link Control. A standard data link protocol.
Data transmission that is synchronized by timing signals. Characters are sent at a fixed

rate.
Time Division Multiplexer. A device that enables the simultaneous transmission of multiple

independent data streams into a single high-speed data stream.
Test Mode. An EIA-lead standard for V.24 circuit CT 142; an output signal (DCE-to-DTE).
Transmit Clock. An EIA-lead standard for V.24 circuit CT 114; an output signal

(DCE-to-DTE).
Transmit Data. An EIA-lead standard for V.24 circuit CT 103; an input signal

(DTE-to-DCE).

V.35
WAN

7510-A2-GB20-00

ITU-T standard for a high-speed, 34-pin, DCE/DTE interface.
Wide Area Network. A network that operates over long distances and spans a relatively

large geographic area (e.g., a country).

March 1997

GL-3

Index

Numbers

511 test pattern, 5-6– 5-7

A

alarm

condition, 4-1

LED, 4-9
ASCII, printable characters, 3-1
ATI

Configuration menu, 3-3

Control menu, 3-1, 6-4

exiting, 2-8

initiating, 2-2

menus, 2-2

monitoring, 4-1

Status menu, 4-2, 4-6, 4-7, 4-8

Test menu, 5-1, 5-3, 5-7, 5-9

C

cables, rear panel, C-1
communication protocol options, A-2
configuration

example, 1-2

option areas, 3-3

option tables, A-1

option worksheets, B-1

saving, 3-2
Configuration menu, 3-3
connectors, rear panel, C-1
Control menu, 3-1, 6-4
crossover EIA-232 cable, C-4
CTS, clear to send LED, 4-11
customer, configuration areas, 3-3

D

data port options, A-5– A-7
data port tests, 5-7
defaults, configuration option, 3-3
detecting problems, 4-1
device

messages, 6-1– 6-2
name, 3-1

reset, 6-4
display , revision numbers, 6-4
displaying

configuration options, 3-3

default configuration, 3-3

identity information, 2-2
DM, data mode LED, 4-10
DTE test, 5-7
DTR, data terminal ready LED, 4-1 1

E

effective access, to ATI, 2-3
EIA-232 pin assignments, C-2– C-4
ending a test, 5-10
ending an ATI session, 2-8
error messages, 6-1
Exit, A TI function, 2-8

F

factory defaults, for configuration options, 3-3
features, 1-1
front panel, status indicators, 1-3

G

glossary, GL-1–GL-4

7510-A2-GB20-00 March 1997

IN-1

Index

H

hardware revision number, 6-4
health and status, messages, 4-3– 4-4

I

identity, 6-4

device name, 3-1

interface

connections, 1-4
network status, 4-6

K

keyboard functions, 2-5

L

LADS (Local Area Data Set)

example, 1-2
maximum distances, 1-3

Operating Mode setting, A-2
lamp test, 5-9
LAN, adapter and cable, C-5
LEDs, 4-8– 4-11

front panel, 1-3

testing, 5-9
loopbacks, 5-2, 5-4

M

main menu, 2-2– 2-3
menu tree, 2-2
messages

alarm and device, 6-1

health and status, 4-3– 4-4

self-test results, 4-4

test status, 4-5

N

navigating the screens, 2-5
network

interface cable, C-5
interface LEDs, 4-10
interface options, A-4
interface status, 4-6
loopbacks, 5-4
performance statistics, 4-7
tests, 5-3

NS, no signal LED, 4-10

O

OK, LED, 4-9
OOF, out of frame LED, 4-10
OOS, out of service LED, 4-10
options

configuration areas, 3-3
configuration tables, A-1
configuration worksheets, B-1

overview

of DSU features, 1-1
of user’s guide, v

P

performance, network statistics, 4-7
pin assignments, C-1
port, LEDs, 4-11
Power On Self–Test, 6-4
problems

Alarm LED on, 6-3
ATI, 6-3
detecting, 4-1
Device Fail, 6-3
error message, 6-1
no data, 6-4

IN-2

March 1997

7510-A2-GB20-00

Index

R

rear panel, connections, 1-4
reset device, 6-4
revision numbers, 6-4
RJ48S network interface cable, C-5
RTS, request to send LED, 4-11
RXD, received data LED, 4-11

S

safety instructions.
saving option changes, 3-2
screen function keys, 2-6
screen work areas, 2-4
screens, for user interface, 2-3
self-test, 6-4
self-test results, 4-4
serial number, 6-4
software revision number, 6-4
specifications, 1-1, D-1
start-up, A TI, 2-1
statistics, of network performance, 4-7
status

indicators on front panel, 1-3

network interface, 4-6

of DSU, 4-2– 4-3

test messages, 4-5
Status menu, 4-2, 4-6, 4-7, 4-8
switching screen areas, 2-7
system

device name field, 3-1

LEDs, 4-9
System and Test Status branch, 4-2
System Contact, 3-1
System Location, 3-1
System Name, 3-1
system name, 6-4

See

Start-Up Instructions

T

technical specifications, D-1
terminal port

direct connection, 2-1
options, A-7

test

DTE, 5-7
LED, 4-9
network, 5-3

status messages, 4-5
Test menu, 5-1, 5-3, 5-7, 5-9
testing, 4-1, 5-1
troubleshooting, 6-3
TXD, transmitted data LED, 4-1 1

U

user interface, 1-3

access, 2-1

async terminal, 2-1

V

V.35 connector, C-3
V.54 sequences, 5-5

W

worksheets, option configuration, B-1

7510-A2-GB20-00 March 1997

IN-3