AT&T 3551, 3550 User Manual
COMSPHERE
3550 Series
Data Service Units
Models 3550 and 3551
User’s Guide
Document No. 3550-A2-GB20-10
COMSPHERE
3550 Series
Data Service Units
Models 3550 and 3551
User’s Guide
Document No. 3550-A2-GB20-10
Printed on recycled paper
P
ara
February 1995
dyn
e
COMSPHERE 3550 Series Data Service Units
COMSPHERE
Model 3550 and 3551
Data Service Units
User’s Guide
3550-A2-GB20-10
2nd Edition (February 1995)
Changes and enhancements to the product and to the information herein will be documented and issued as a new release.
A customer opinion card is provided at the front of this publication and your comments are appreciated. If the form has
been removed, address comments to AT&T Paradyne Corporation, T echnical Publications, 8545 126th Ave. N., P.O.
Box 2826, Largo, Florida, U.S.A. 34649-2826. AT&T Paradyne may use or distribute any of the information supplied, as
appropriate, without incurring any obligation whatsoever.
United States
FCC Registration number: AW292J-61661-DD-N
PSTN Ringer Equivalence number (REN): DBM option 0.7B
Canada
V.32 Dial Backup Module
Certification number: 230 3684 A
DOC Load number: 7
ACCULINK is a registered trademark of AT&T.
ACCUNET is a registered trademark of AT&T.
ANALYSIS is a trademark of AT&T.
COMSPHERE is a registered trademark of AT&T.
DATAPHONE is a registered trademark of AT&T.
Dataroute is a registered trademark of Bell Canada.
MCI is a registered trademark of MCI Communications Corporation.
Microsoft is a registered trademark of Microsoft Corporation.
US SPRINT is a registered trademark of US SPRINT Communications Company.
Windows is a trademark of Microsoft Corporation.
COPYRIGHT E 1995 AT&T Paradyne Corporation. All rights reserved.
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 A T&T Paradyne Corporation, 8545 126th A venue North, P.O. Box 2826, Largo, Florida 34649-2826.
AT&T 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, AT&T Paradyne Corporation reserves the right to revise this publication and to make changes from
time to time in the contents hereof without obligation of AT&T Paradyne Corporation to notify any person of such revision or changes.
A February 1995 3550-A2-GB20-10
Important Safety Instructions
1. Read and follow all warning notices and instructions marked on the product or
included in the manual.
2. This product is intended to be used with a three-wire grounding type plug – a plug
which has a grounding pin. This is a safety feature. Equipment grounding is vital to
ensure safe operation. Do not defeat the purpose of the grounding type plug by
modifying the plug or using an adaptor.
Prior to installation, use an outlet tester or a voltmeter to check the ac receptacle for
the presence of earth ground. If the receptacle is not properly grounded, the
installation must not continue until a qualified electrician has corrected the problem.
If a three-wire grounding type power source is not available, consult a qualified
electrician to determine another method of grounding the equipment.
3. 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.
4. Do not allow anything to rest on the power cord and do not locate the product where
persons will walk on the power cord.
Safety Instructions
5. 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.
6. 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.
7. 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.
8. 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.
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.
B3550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
Notices
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C February 1995 3550-A2-GB20-10
Government Requirements
The Federal Communications Commission (FCC) requires that instructions pertaining to
connection to the telephone network be included in the installation and operation manual. Specific
instructions are listed in this section.
Notice to Users of the Digital Data Service
This equipment complies with Part 68 of the FCC rules. On the bottom of the equipment is a label
or silk-screened text that contains, among other information, the FCC registration number and
Ringer Equivalence Number (REN) for this equipment. If requested, please provide this
information to your telephone company.
The REN is useful to determine the quantity of devices you may connect to your telephone line
and still have all of those devices ring when your number is called. In most, but not all areas, the
sum of the RENs of all devices should not exceed 5. T o be certain of the number of devices you
may connect to your line, as determined by the REN, you should call your local telephone
company to ascertain the maximum REN for your calling area.
If your DSU causes harm to the telephone network, the telephone company may discontinue your
service temporarily. If possible, they will notify you in advance. But if advance notice is not
practical, you will be notified as soon as possible. You will be advised of your right to file a
complaint with the FCC.
Safety Instructions
If your DSU causes harm to the telephone network, the telephone company may discontinue your
service temporarily. If possible, they will notify you in advance. But if advance notice is not
practical, you will be notified as soon as possible. You will be advised of your right to file a
complaint with the FCC.
Your telephone company may make changes in its facilities, equipment, operations, or procedures
that could affect the proper operation of your equipment. If so, you will be given advance notice so
as to give you an opportunity to maintain uninterrupted service.
The DBM cannot be used on public coin-operated telephone service provided by the telephone
company. Connection to party-line service is subject to state tariffs. (Contact the state public utility
commission, public service commission, or corporation commission for information.)
No repairs may be performed by the user. Should you experience difficulty with this equipment,
refer to the Equipment Warranty and Support section of Chapter 1.
For Digital Data Service (DDS) installations, inform the local telephone company of the
appropriate network channel interface code for the service you desire.
DDS
Interface
Code
04DU5-24 2400
04DU5-48 4800
04DU5-96 9600
04DU5-19 19,200
Data Rate
(bps)
04DU5-56 56,000
D3550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
The DDS Service Order Number is 6.0Y. The jack configurations required are RJ48S for the
Model 3550 DSU and RJ48T for the Model 3551. With an RJ48T configuration, you must specify
the number of data lines you require. Refer to the Technical Specifications section of Chapter 1 for
V.32 DBM jack information.
After the telephone company has installed the requested jack, you can connect the DSU with the
appropriate cable (provided). An FCC-compliant telephone cord and modular plug is provided
with this equipment. This equipment is designed to be connected to the telephone network or
premises wiring using a compatible modular jack that is Part 68 compliant.
E February 1995 3550-A2-GB20-10
Table of Contents
Preface
About This Guide vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use This Guide vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documents viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Documents viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. About Your DSU
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upgrades A vailable 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Warranty and Support 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Installing the Model 3550 DSU
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before You Begin 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Change Hardware Straps 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Place the DSU 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the DSU 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the Network 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Addressing the Unit 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the DSU to a DTE 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Operation and T esting Connections 2-11. . . . . . . . . . . . . . . . . . . .
3. Installing the Model 3551 DSU
Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before You Begin 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Change Hardware Straps 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the DSU 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the Network 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the DSU to a DTE 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Addressing the Unit 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Operation and T esting Connections 3-10. . . . . . . . . . . . . . . . . . . .
i3550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
4. Operating the DSU
5. Configuring the Unit
Appendix
Overview 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DCP and SDCP Operation 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu Structure 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Branch 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backup Branch 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Branch 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Branch 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Branch 4-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Messages Branch 4-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the DCP to Set Configuration Options 5-2. . . . . . . . . . . . . . . . . . . .
Configuration Option T ables 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index
A. DSU Menu A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Configuration Worksheets B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Status Indicators and Control Panel Messages C-1. . . . . . . . . . . . . . .
D. Pin Assignments D-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E. Application Configurations E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F. Equipment List F-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii February 1995 3550-A2-GB20-10
Table of Contents
List of Figures
Figure Page
2-1 Model 3550 Hardware Switch Location (shown without a TDM/Flex) 2-3. . . . . . . . . .
2-2 Model 3550 Electrical Connection 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Model 3550 DSU NMS Connection 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Model 3550 DSU Dial (PSTN) Network Connection 2-6. . . . . . . . . . . . . . . . . . . . . . . .
2-5 Model 3550 DSU DDS (LADS) Network Connection 2-7. . . . . . . . . . . . . . . . . . . . . . .
2-6 Addressing Example 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7 Installing Cables 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Model 3551 DSU Switch and Jumper Locations 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 COMSPHERE 3000 Series Carrier, Rear View 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Model 3551 DSU Installation and Circuit Pack Lock 3-6. . . . . . . . . . . . . . . . . . . . . . . .
3-4 Model DSU V.35 Interconnect Cable Installation 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Addressing Example 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Model 3550 Diagnostic Control Panel 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 SDCP and Model 3551 DSU Faceplate 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Loopbacks 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-1 Digital Network Connector D-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-2 3600 Hubbing Device (3600-F3-300) D-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-3 Model 3551 DSU 25-Pin EIA-232/25-Pin V.35
Rear Connector Plate (3000-F1-021) D-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-4 V.35 Interconnect Cable (3000-F1-510) D-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-5 EIA-232-D Crossover Cable (4951-035F
D-6 V.35 Crossover Cable (3211-178F) D-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E-1 Point-to-Point Application Configurations with Internal and
External V.32 Backup E-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E-2 Multipoint Application Configurations E-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
) D-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iii3550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
Table Page
1-1 General Technical Specifications 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 DSU T echnical Specifications 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 V.32 DBM Technical Specifications 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 2-Port TDM/Flex T echnical Specifications 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Model 3550 DSU Switch Settings 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 LADS Connection Distances 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Model 3551 DSU Switch Settings 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Model 3551 DSU Jumper Straps 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Identity Descriptions 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 Backup Branch Menu Selections 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Digital T est Results 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4 End-to-End Test Results 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5 Bit Error Rate Test Results 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6 Directory Entry and Password Characters 4-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-7 Lead States 4-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 DSU Configuration Options 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Diagnostic (DSU) Configuration Options 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3 Diagnostic (DBM) Configuration Options 5-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4 Diagnostic (External DBU) Configuration Options 5-10. . . . . . . . . . . . . . . . . . . . . . . . .
5-5 Diagnostic (General) Configuration Options 5-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-6 DBM Configuration Options 5-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-7 External DBU Configuration Options 5-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-8 General Configuration Options 5-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-9 Backup Configuration Options 5-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-10 MUX (Setup) Configuration Options 5-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-11 MUX (Port) Configuration Options 5-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-12 Port Speed (DSU) Configuration Options 5-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-13 Port Speed (DBM) Configuration Options 5-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-14 Port Speed (External DBU) Configuration Options 5-29. . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables
iv February 1995 3550-A2-GB20-10
Table of Contents
Table Page
C-1 DSU Status Indicators C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-2 SDCP Status Indicators C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-3 Device Health and Status Messages C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-4 Expanded Health and Status Messages C-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-5 Subnetwork Health and Status Messages C-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-6 Command Progress Messages C-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-7 Dial Backup Progress Messages C-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-8 Command Error Messages C-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-9 Dial Backup Error Messages C-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-10 TDM/Flex Error Messages C-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-1 Model 3550 – Digital (DDS) Network Connector Pin Assignments D-2. . . . . . . . . . . . .
D-2 Model 3550 – Dial (Analog) Network Connector Pin Assignments D-2. . . . . . . . . . . . .
D-3 3600 Hubbing Device Pin Assignments D-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-4 3600 Hubbing Device CC IN/DC OUT Jack Pin Assignments D-3. . . . . . . . . . . . . . . . .
D-5 EIA-232/V.24 Connector Pin Assignments D-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-6 V.35 Connector Pin Assignments D-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v3550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
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vi February 1995 3550-A2-GB20-10
Preface
About This Guide
This user’s guide provides the information needed to
install and operate your Model 3550 or 3551 data service
unit (DSU), which may or may not be equipped with a
dial backup module (DBM) or time division multiplexer
(TDM). If your DSU is not equipped with these options,
skip the information that pertains to them.
Be sure to read the safety and regulatory information at
the beginning of this guide.
It is assumed that you are familiar with the functional
operation of digital data communications equipment.
How to Use This Guide
This guide provides basic information about your DSU,
how to install it and verify that it is installed and operating
correctly, how to operate the unit and its options, and how
to configure it.
Two installation chapters are provided, one for the
Model 3550 DSU and one for the Model 3551 DSU.
Select the chapter that applies to your DSU.
Refer to the following chapters or appendices, as
needed.
Chapter 1 Provides a general overview of the
DSU and its options, information
about equipment upgrades and
conversions, and the unit’s technical
specifications. It also includes
equipment warranty information and
equipment return instructions.
Chapter 3 Provides step-by-step instructions for
installing your carrier-mounted
Model 3551 DSU.
Chapter 4 Describes how to operate your DSU
and its DBM and TDM/Flex options.
Chapter 5 Presents the basics of setting and
changing configuration options, and
provides Configuration Option Set
Tables, which describe each
configuration option in an option set,
along with its possible settings.
Appendix A Provides a diagram for navigating
the DSU’s menu structure.
Appendix B Summarizes the configuration option
sets for you.
Appendix C Lists the DSU’s status indicators, as
well as their messages, identifying
when they appear.
Appendix D Shows point-to-point and multipoint
application configurations and
network hookups.
Appendix E Provides cable and connector pin
assignments.
Appendix F Equipment List
Glossary
Reference Card
Chapter 2 Provides step-by-step instructions for
installing your standalone
Model 3550 DSU.
vii3550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
Related Documents
Other product documentation includes the following:
3000-A2-GA31 COMSPHERE 3000 Series
Carrier, Installation Manual
3000-A2-GB41 COMSPHERE –48 Vdc Central
Office Power Unit, Installation
Guide
6700-A2-GB41 COMSPHERE 6700 Series
Network Management System,
User’s Guide, Security Manager
Feature Supplement
6700-A2-GY31 COMSPHERE 6700 Series
Network Management System,
User’s Guide
Ordering Information
To order AT&T Paradyne documentation, please call
1-800-545-2354, extension 2222.
Reference Documents
• A T&T Technical Reference 41458
• A T&T Technical Reference 61330
• A T&T Technical Reference 62310 – 1987
• Bell Canada DCTE Specifications
• Bell Communications Research Technical
Reference Publication 41028
• CCITT V.35 (ISO 2593)
• EIA-232-D/V.24 (ISO 2110)
• Integrated Network Corporation Compatibility
Bulletin CB-INC-101
• Pacific Bell PUB L-780035-PB/NB
• Pacific Bell PUB L-780036-PB/NB
viii February 1995 3550-A2-GB20-10
About Your DSU
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.32 DBM 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-Port TDM/Flex 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upgrades Available 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Warranty and Support 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Service 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Out of Warranty 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enhanced Support Services 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Overview
The Model 3550 or 3551 data service unit (DSU)
supports communication between computers and other
data processing devices by providing connections to
digital data service (DDS) transmission facilities. Both
point-to-point and multipoint configurations are
supported.
The following sections describe the standard features
of the DSU, as well as the features of the options that may
have been ordered with your unit. The technical
specifications of the DSU and its orderable options are
near the end of the chapter.
Standard Features
The Model 3550 or 3551 DSU offers the following
features:
• Multispeed operation. The DSU operates at data
rates of 2.4, 4.8, 9.6, 19.2, 38.4, and 56 kbps
full-duplex over the digital data service (DDS)
network.
Two DTE connectors (interfaces) are provided for
Port 1: EIA-232-D and V.35. Use the EIA-232-D
connector for data rates up to and including
19.2 kbps; use the V.35 connector for higher rates.
• Rate Adaption. With this feature, the DSU can
adapt its data rate to a low-speed application while
operating over the high-speed DDS circuit.
• LADS operation. The DSU can operate as a local
area data set (LADS) (sometimes called a
limited-distance modem, or LDM) at 2.4, 4.8, 9.6,
19.2, 38.4, 56, or 64 kbps.
• Single-Port Async/Sync. The single-port
asynchronous-to-synchronous feature makes it
possible to send asynchronous data over the
synchronous network.
• Nondisruptive Diagnostics. When set up to use
nondisruptive diagnostics, the DSU sends
diagnostic data without interrupting or disrupting
customer data.
• NMS control. The DSU can be controlled by
AT&T Paradyne’s COMSPHEREr6700 Series
NMS. The 6700 Series NMS operates using
Advanced Diagnostic protocol (ADp).
The Model 3550 DSU requires a hubbing device
for connection to the NMS; the Model 3551 DSU is
connected to the NMS through the shared
diagnostic unit (SDU) in the COMSPHERE
3000 Series Carrier.
1-13550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
• Diagnostic Control Panel control. The
Model 3550 DSU is controlled from its diagnostic
control panel (DCP). The diagnostic control panel
for the Model 3551 DSU, called a shared diagnostic
control panel (SDCP), is installed in the
3000 Series Carrier. Both control panels display
information about the DSU on a 2-line,
16-character liquid crystal display (LCD) and
through light-emitting diode (LED) status
indicators.
NOTE
Except where a distinction is
made, the term DCP refers to both
types of diagnostic control panels,
the DCP or the SDCP.
• Full tributary diagnostics. The DSU supports a
full complement of diagnostic tests and commands.
Diagnostics can be addressed to and sent to
tributaries from a 6700 Series NMS workstation or
from the DCP of a control DSU.
Optional Features
The Model 3550 DSU can be ordered with the
following optional features:
• V.32bis 14.4 kbps Dial Backup Module (DBM)
• Time Division Multiplexer (TDM/Flex)
The Model 3551 DSU can be ordered with a V.32bis
14.4 kbps DBM, or it can be used with an external DBU.
If your DSU is not equipped with these options, go to
the next section.
V.32 DBM
The V.32bis 14.4 kbps dial backup module (referred to
as DBM throughout this guide) childboard is attached to
the DSU circuit card. The DBM provides the following
features:
• Multispeed point-to-point backup. The DBM
provides point-to-point service over the 2-wire dial
network. Backup rates available are 2.4, 4.8, 9.6,
12.0, and 14.4 kbps.
• External dial backup. The DSU can use an
external dial backup unit (DBU – e.g., a
3800 Series dial/lease modem) to provide backup.
This feature may be used in a point-to-point DSU
configuration and can be used with either a control
or tributary DSU.
For more information about the 3000 Series Carrier or
the SDCP, refer to the COMSPHERE 3000 Series Carrier,
Installation Manual. For more information about the
6700 Series NMS, refer to the COMSPHERE 6700 Series
Network Management System, User’s Guide. These are
identified in the Related Documents section of the
Preface, which also provides a telephone number you can
call to order these documents.
• Independent operation. Although the DBM is
installed on the DSU, the two are configured
separately and most tests can be run on either
independent of the other (e.g., you can run a test on
the DBM while a test is running on the DSU).
• Security. There are four levels of call setup
security: None, Password, Callback, and Alarm.
• Management control. Dial backup can be initiated
from a 6700 Series NMS, the DSU’s DCP, or it can
be initiated automatically by the DSU-DBM.
• Automatic setup and restoration. When
configured for automatic backup, the DSU-DBM
initiates dial backup when it detects a failure in the
network, then restores the data path to the DDS
circuit when the network returns to service.
1-2 February 1995 3550-A2-GB20-10
About Your DSU
2-Port TDM/Flex
The 2-port TDM/Flex is a separate circuit card that
attaches to the Model 3550 DSU. It allows independent
ports to share one standard digital point-to-point facility.
The 2-port TDM/Flex provides the following features:
• Port capacity. This feature permits the DSU to
operate as a digital sharing device and provides two
independent ports. Port 1 is on the DSU and Port 2
is on the 2-port TDM/Flex. Either port can operate
as an EIA-232 or V.35 interface.
• Multiplexing. With this option, time division
multiplexing can be performed using two
independent ports to share one standard DDS
point-to-point circuit.
• Line speeds. The TDM/Flex operates at all line
speeds supported by the DSU: 2.4, 4.8, 9.6, 19.2,
38.4, and 56 kbps. For LADS operation, 64 kbps is
also supported.
• Port speeds. Each port can be set to 1.2, 2.4, 4.8,
9.6, 14.4, 19.2, 48, 56, or 64 kbps. In 2-port
TDM/Flex applications, the sum of the port speeds
cannot exceed the line speed.
• Asynchronous operation. Although the DSU
provides synchronous transmission through the
DDS network, any port can be configured for
asynchronous operation. When the 2-port
TDM/Flex is installed, asynchronous-tosynchronous conversion can be performed.
Asynchronous data rates of 150, 300, 600, 1200,
and 1800 bps are supported, along with the
synchronous data rates.
• Digital sharing. With this feature, the ports can
share the same channel. All ports in a
digital-sharing group operate at the same speed, and
all receive the same data. When configured for
DSD (digital-sharing device) port contention, only
one port at a time is allowed to send.
• Switched-carrier emulation. In 2-port TDM/Flex
transmission, switched-carrier emulation is optional
for each port, for both the inbound (toward the
control DSU) and outbound (from the tributary
DSU) directions.
• NMS control. Control of a 3550 DSU with 2-port
TDM/Flex can be performed from a 6700 Series
NMS or the DSU’s DCP.
• Point-to-point backup. A 3550 DSU with 2-port
TDM/Flex can also have a DBM installed for
point-to-point dial backup. If backup is at a
different speed than the DSU’s speed, TDM/Flex
operation automatically changes to the lower
speed.
Upgrades Available
Although your DSU may not currently have a DBM or
2-port TDM/Flex installed, you can add these features at a
later time. Both the DBM and 2-port TDM/Flex features
are available as upgrades.
You can order the option you want and install it
yourself (referred to as a field installation). Refer to the
Equipment List in Appendix F for the feature number to
order.
Technical Specifications
Tables 1-1 through 1-4 list the technical specifications
for the following:
• General specifications that apply to all Model 3550
and 3551 circuit cards (T able 1-1)
• Specifications for the Model 3550 and 3551 DSU
only (T able 1-2)
• Specifications for the V.32 DBM (Table 1-3)
• Elastic store per port. A transmit elastic store
buffer is provided for each port for the support of
extended circuits. Both digital and analog
extensions are supported.
• Specifications for the 2-port TDM/Flex
1-4
1-33550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
Table 1-1
(1 of 2)
General Technical Specifications
Specifications
APPROVALS
FCC Part 15
FCC Part 68
UL
3550 DSU
3551 DSU, 3000 Series Carrier
CSA
Safety
3550 DSU
3551 DSU, 3000 Series Carrier
Emissions
Bell Canada
AC POWER REQUIREMENTS
3550 DSU
3550 DSU with DBM
3550 DSU with 2-Port TDM/Flex
3551 DSU
3551 DSU with DBM
V.32 DBM
3000 Series Carrier (16 DSUs with DBMs
plus SDU and fan module)
Criteria
Class A digital device
AW292J-61661-DD-N
Listed U L 1950, second edition
Recognized Component UL 1950, second edition
Certified CSA 22.2, No. 950-M89
Certified Component CSA 22.2, No. 950-M89
CSA 108.8 – M1983, Class A digital apparatus
“DCTE Specifications,” July 1989, Issue 1
24 Vac (CT), 60 Hz +3 (0.093 amp, 5.8 watts at 115 Vac)
24 Vac (CT), 60 HZ ± 3 (0.115 amp, 9.5 watts at 115 Vac)
24 Vac (CT), 60 Hz +3 (0.103 amp, 8.6 watts at 115 Vac)
24 Vac (CT), 60 Hz +
24 Vac (CT), 60 Hz +
24 Vac (CT), 60 Hz +3 (0.024 amp, 2.0 watts at 115 Vac)
90—132 Vac, 60 Hz +
3 (0.029 amp, 4.5 watts at 1 15 Vac)
3 (0.080 amp, 8.0 watts at 1 15 Vac)
3 (1.650 amp, 165 watts at 1 15 Vac)
DTE INTERFACE
3550 DSU
25-pin D-subminiature connector
34-pin connector
3551 DSU with
25-Pin V.35 Interface
Uses a Rear Connector Plate with two
25-pin D-subminiature connectors.
ENVIRONMENT
Operating Temperature
Storage Temperature
Relative Humidity
Shock and Vibration
EIA-232-D/CCITT V.24 (ISO 2110)
CCITT V.35 (ISO 2593)
EIA-232-D/CCITT V.24 (ISO 2110)
CCITT V.35 (ISO 2593)
(A V.35 Interconnect Cable is required to use the V.35 connector. The
cable provides an interface between the DSU’s 25-pin D-type connector
and the DTE cable’s V.35 connector.)
32° to 122° F (0° to 50° C)
–4° to 158° F (–20° to 70° C)
5%—95% (noncondensing)
Withstands normal shipping and handling
1-4 February 1995 3550-A2-GB20-10
Specifications Criteria
HEAT DISSIPATION (MAX.) AT 115 VAC
3550 DSU
3550 DSU with DBM
3550 DSU with 2-Port TDM/Flex
3551 DSU
3551 DSU with DBM
3000 Series Carrier (16 DSUs with DBMs
plus SDU and fan module)
About Your DSU
Table 1-1
(2 of 2)
General Technical Specifications
22.16 Btu/hr
29.00 Btu/hr
29.21 Btu/hr
22.16 Btu/hr
27.30 Btu/hr
563.00 Btu/hr
PORT RATES Async or Sync rates: 64, 56, 48, 19.2, 14.4, 12.0, 9.6, 4.8, 2.4, and
NMS COMPATIBILITY
1.2 kbps
Other asynchronous rates (e.g., 150, 300, 600, and 1800 bps) can be
obtained through oversampling
Asynchronous rates support CCITT V.14 extended rate range at
8 to 12 bits per character, including the
percent overspeed/underspeed compensation at 10 bits per character)
COMSPHEREr 6700 Series NMS, Release 4.0 or greater
start
and
stop
bit (+2.3, –2.5
1-53550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
Table 1-2
DSU Technical Specifications
Specifications Criteria
APPLICATION Full- or half-duplex data transmission via point-to-point or multipoint
DDS network, or local area data channel
COMMUNICATION LINE Leased or private 4-wire DDS line
DATA RATES
Digital Services (DDS, ASDS)
LADS
When timing is external (provided by the
DTE), the DTE’s clock must be within these
ranges.
DDS NETWORK INTERFACE
3550 DSU
3551 DSU
2.4, 4.8, 9.6, 19.2, 38.4, and 56 kbps
2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 kbps
64 kbps " 1 1 bps
56 kbps " 9 bps
38.4 kbps " 4 bps
19.2 kbps " 5 bps
9.6 kbps " 1 bps
4.8 kbps " 0 bps
2.4 kbps " 0 bps
8-pin modular jack, USOC RJ48S
(One or two) 50-pin connector, USOC RJ48T
DIAGNOSTIC INTERFACE
3550 DSU
3551 DSU
NETWORK COMPATIBILITY
AT&T Technical Reference 62310 – 1987
Integrated Network Corporation
Compatibility Bulletin CB-INC-101, and
Pacific Bell publications
PUB L-780035-PB/NB and
PUB L-780036-PB/NB
DSU COMPATIBILITY
Primary Channel
Requires 3600 Series Hubbing Device which provides
two 8-pin modular jacks
Via the SDU in the COMSPHEREr 3000 Series Carrier
2.4, 4.8, 9.6, and 56 kbps
19.2 kbps loop at levels of +6, 0, or –10 dBm
All A T&T Paradyne digital products and other products that are
compliant with A T&T Technical Reference 62310 – 1987
1-6 February 1995 3550-A2-GB20-10
About Your DSU
Table 1-3
V.32 DBM Technical Specifications
Specifications Criteria
RINGER EQUIVALENCE NUMBER (REN) DBM option 0.7B
APPLICATION Full- or half-duplex data transmission via analog 2-wire dial network,
point-to-point
MODULATION AND FREQUENCY At 14.4 and 12 kbps: CCITT V.32bis, 1800 Hz
At 4.8 and 9.6 kbps: CCITT V.32, 1800 Hz
At 2.4 kbps: CCITT V.22bis, 2400 Hz
COMMUNICATION LINE 2-wire analog (PSTN) line
DATA RATES 2.4, 4.8, 9.6, 12, 14.4 kbps
DBM COMPATIBILITY If Call Setup is set for Callback or Password security, then the device is
compatible with a Model 3550 or 3551 V.32 DBM.
any
V.32 modem can be
APPROVALS
DOC
Certification (PSTN)
Load Number
RECEIVE VF INTERFACE
Dynamic Range
V.32 2-wire PSTN
Impedance
SWITCHED NETWORK INTERFACE
3550 DSU
If Call Setup is set for Alarm or None, then
used.
Also, V.22bis at 2.4 kbps can be used.
230 3684 A
7
–43 to –10 dBm
600 Ω
6-pin modular jack
Permissive: USOC RJ11C
8-pin modular jack
Programmable: USOC RJ45S
3551 DSU
TRANSMIT VF INTERFACE
Signal Level
V.32 2-wire Dial (PSTN)
Impedance
(One or two) 50-pin connector
Permissive: USOC RJ21X
Programmable: USOC RJ27X
Permissive: –9 dBm
Programmable: –12 to 0 dBm (set by a resistor in the telco jack)
600 Ω
1-73550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
Table 1-4
2-Port TDM/Flex Technical Specifications
Specifications Criteria
APPLICATION
Multiplexing
Digital sharing
PORT SYNCHRONOUS RATES 1.2, 2.4, 4.8, 9.6, 12.0, 14.4, 19.2, 48, 56, and 64 kbps
PORT ASYNCHRONOUS RATES 150, 300, 600, 1200, and 1800 bps plus all primary (DSU) rates.
PORT DTE INTERFACE
3550 DSU (2-port TDM/Flex)
NMS SUPPORT TDM/Flex capability is fully supported by Release 4.0 or greater
Provides time division multiplexing of two independent ports.
Allows consecutive ports to share the same TDM/Flex channel.
Asynchronous rates support +2.3, –2.5 percent overspeed/
underspeed compensation.
Provides an additional 25-pin D-subminiature connector for a total of two
EIA-232 or V.35 interfaces.
COMSPHERE 6700 Series NMS.
Equipment Warranty
and Support
AT&T Paradyne’s Customer Assistance Center is
available 24 hours a day to help you place an installation
request, report a hardware or software problem, or place a
trouble report. The center provides technical support and
remotely diagnoses equipment problems Monday through
Friday, between the hours of 8 a.m. and 8 p.m. EST,
excluding holidays. You can also call the center if you
participate in the on-site support program (refer to the
Enhanced Support Services section) or if you would like
to request support on a time and materials basis.
Call the following toll-free number to reach the
Customer Assistance Center:
1-800-237-0016
NOTE
Effective January 1, 1995, the
Customer Assistance Center is
available to provide technical
support 24 hours a day, 365 days
a year.
Equipment Service
To obtain service under your warranty, call the
Customer Assistance Center at the number listed above.
Please have the following information available before
you call:
Company Name and Address
Contact Name and T elephone Number
Shipping Address, if different from the company
address
Billing Address, if different than the shipping
address
Model Number and Serial Number of the unit
A brief description of the problem
The Customer Assistance Center will verify that the
equipment is in need of repair. You are provided a Return
Materials Authorization (RMA) number to help expedite
the repair request. Once you receive an RMA number,
pack the unit securely and ship the package insured and
postage prepaid to:
AT&T Paradyne Corporation
Customer Support
Attn: Repair Center
8550 Ulmerton Road, Building B
Largo, Florida 34641
Make sure the RMA number is in a visible location on
the outside of the package.
1-8 February 1995 3550-A2-GB20-10
About Your DSU
Out of Warranty
If your equipment is out of warranty and you do not
have a maintenance support agreement, factory repair
support is available.
To send equipment to AT&T Paradyne’s Repair Center,
call the following toll-free number Monday through
Friday, between the hours of 8 a.m. and 5 p.m. EST,
excluding holidays:
1-800-772-7691
Please have your purchase order number and the
information listed in the Equipment Service section ready
when you call for your RMA number. Package and ship
the equipment to the Repair Center as described, making
sure the RMA number is clearly visible on the outside of
the package.
Enhanced Support Services
In addition to the customer support described, AT&T
Paradyne offers a wide variety of enhanced customer
support programs that are designed to meet our customers
needs. Our high quality support programs range from
equipment installation to premium on-site support, as well
as network management.
For more information about our enhanced support
services, contact your AT&T Paradyne representative, or
call the following toll-free number, 8 a.m. to 5 p.m. EST,
excluding holidays:
1-800-482-3333
1-93550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
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1-10 February 1995 3550-A2-GB20-10
Installing the Model 3550 DSU
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before You Begin 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Change Hardware Straps 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Place the DSU 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the DSU 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Up Routine 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the Network 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the NMS 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the Dial (or PSTN) Network 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the DDS (or LADS) Network 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Addressing the Unit 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tributary DSU Addressing 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the DSU to a DTE 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Port 2 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Operation and Testing Connections 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Network Addresses 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying the Network 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying DBM Operation 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying TDM/Flex Operation 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Tests 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Overview
The Model 3550 DSU is designed for desktop
operation and is delivered ready to connect to the
network. It is configured as a tributary DSU for operation
at 9.6 kbps on a multipoint circuit.
If the unit was ordered with a TDM/Flex installed,
Ports 1 and 2 are configured for 9.6 kbps operation, and
configured as a digital sharing device (DSD). Both ports
are configured for EIA-232 operation, rather than V.35
operation. Refer to the MUX (Port) option set tables in
Chapter 5 to change this configuration on a port-by-port
basis.
Installation consists of the following steps, which
should be performed in the order listed.
• Physical installation
• Hardware straps
• Electrical connection
• Network diagnostic connection
• Software configuration
• DDS network (or LADS) connection
• Dial (or PSTN) network connection if a DBM is
installed, or if using an external dial backup unit
(DBU)
• DSU DTE connection
• V erification testing
Although the Model 3550 DSU is designed for desk or
table-top operation, you can order an ACCULINKr
3100 Series CSU wall-mount adapter if you want to
mount the DSU on a wall, an equipment shelf, a 19-inch
RS-310-C or 23-inch AT&T DATAPHONEr equipment
cabinet. Refer to Appendix F to order the adapter.
Before You Begin
Your installation site should be clean, well-lighted,
well-ventilated, and free from environmental extremes.
A dedicated grounded ac outlet that is protected by a
circuit breaker should be installed within 6 feet of the
DSU’s planned location. The outlet should be capable of
supplying 90 to 132 Vac 60 Hz (U.S. and Canada). The
2-13550-A2-GB20-10 February 1995
COMSPHERE 3550 Series Data Service Units
circuit must be capable of supplying a minimum of
2 amperes at 115 Vac. Refer to the Technical
Specifications section in Chapter 1 for additional power
requirements.
CAUTION
The ac transformer contains a
3-wire grounding-type plug which
has a grounding pin. This is a
safety feature. Do not defeat the
purpose of the grounding plug by
modifying it or by using an
adapter.
Prior to installation, use an outlet
tester to check the ac receptacle
for earth ground. If the power
source does not provide a ground
connection, consult an electrician
to determine another method of
grounding the DSU before
proceeding with the installation.
Before connecting the DSU, you need to contact the
telephone company to coordinate your installation before
connecting the DSU to their network. The DSU can only
be operated at the data rate for which access to the DDS
network is provided. If a DBM is installed, the DSU must
also be connected to the dial network. You must notify the
telephone company before you connect to the dial
network. Refer to the notice at the front of this guide to
ensure compliance with FCC, Bell Canada, and Canadian
DOC rules.
No on-site assembly of the DSU is required. However,
installation should not proceed if any of the following is
missing:
• A power cord with table-top ac transformer
• A 14-ft cable for connection to the DDS network,
with 8-pin RJ48S modular plug on each end
For Canadian purchasers, an 8-pin RJ48S connector is
on one end while a 6-pin connector is on the other is
required (order feature number 3000-F1-006).
If the DSU is equipped with a DBM, a dial interface
cable should have been ordered.
• Permissive (RJ11C) – a 6-pin modular plug at each
end (feature number 4400-F1-53x or 3600-F3-503).
• Programmable (RJ45S) – an 8-pin modular plug at
each end (feature number 4400-F1-54x).
Contact your AT&T Paradyne representative if any of
these items is missing from the shipping container, or to
order the appropriate dial interface cable.
If your DSU is equipped with a DBM, you may need to
change the DSU’s hardware straps before installing the
DSU.
How to Change
Hardware Straps
HANDLING PRECAUTIONS
FOR
ST ATIC SENSITIVE DEVICES
AT&T Paradyne products are
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
proper static control precautions,
contact the nearest AT&T Paradyne
Customer Support office.
The Model 3550 DSU has a switch located behind its
diagnostic control panel (DCP). This switch contains two
straps, one that controls the permissive or programmable
connection when a DBM is installed, and one that controls
the frame-to-signal grounds. T able 2-1 shows the DSU’s
settings. Refer to Figure 2-1 and the following steps if you
need to change one of these straps.
.
Procedure
1. With your thumbs under the edge of the front
bezel, firmly press upward to lift the bezel from
the tabs securing it in place.
2. Swing the front bezel up and set the bezel aside.
3. Refer to Table 2-1 to determine which switch
needs to be changed. Then, using a small
instrument, carefully change the position of the
switch.
4. Reinsert the front bezel’s hinge tabs into position
and swing the bezel down. Snap the bezel back
into place.
2-2 February 1995 3550-A2-GB20-10
Installing the Model 3550 DSU
S1 1
Figure 2-1. Model 3550 Hardware Switch Location (shown without a TDM/Flex)
Table 2-1
Model 3550 DSU Switch Settings
Switch Position Switch Setting Function
ON
S1-1
S1-2
ON is to the rear as you face the front of the DSU.
Off is to the front.
(default)
Off Programmable V.32 DBM transmit level between –12 dBm and 0 dBm
ON Frame ground (FG) connected to signal ground (SG)
Off
(default)
Permissive V.32 DBM transmit output level of –9 dBm
FG connected to SG through 100 ohm resistor
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COMSPHERE 3550 Series Data Service Units
Where to Place the DSU
As mentioned earlier, the DSU must be placed within
6 feet of a dedicated grounded ac outlet that is protected
by a circuit breaker.
The distance between the DSU and its DTE must be
within EIA-232-D/V.24 limits, or V.35 limits if operating
the DSU at speeds greater than 19.2 kbps.
• For the EIA-232 connector, the typical maximum
distance is 50 feet at speeds less than or equal to
19.2 kbps. If a longer distance is needed, use high
quality , low capacitance cable and ensure that the
effective shunt capacitance of the circuit (measured
at the DSU and including the capacitance of the
cable and the DTE) does not exceed 2500
picofarads, as specified in EIA-232-D.
• For the V.35 connector, the maximum distance
recommended between the DSU and the DTE is
nominally 1000 feet.
Allow 1 to 2 feet of clearance around the DSU for
access and cable connections during installation.
Installing the DSU
Before installing the DSU, label the circuit breaker that
protects the ac wall outlet, and make sure that it is set to
ON. Then, proceed with the installation.
.
Procedure
1. Place the DSU in its planned location. Make sure
the ventilation slots are not blocked.
2. At the rear of the DSU (Figure 2-2), insert the ac
transformer, circular plug into the interface labeled
POWER.
3. Plug the ac transformer’s 3-prong plug into the ac
wall outlet.
CAUTION
Only use the power
transformer designed for the
Model 3550 DSU. Using other
transformers may result in
personal injury or damage to
the equipment.
Figure 2-2. Model 3550 Electrical Connection
2-4 February 1995 3550-A2-GB20-10
Installing the Model 3550 DSU
Power-Up Routine
When power is applied, the DSU:
• Determines what options (DBM or TDM/Flex) are
installed, if any.
• Runs a Device Test on itself and each of the
installed options.
During the tests, all indicators on the DCP light
briefly and the message Power-Up Tests appears on
the liquid crystal display (LCD).
• Displays the results of each test momentarily as
Pass, Fail, or Abrt. (Abrt indicates that the Device
Test was aborted because a network loopback was
in progress during the power-up procedure.) These
tests take about 20 seconds to complete.
If a TDM/Flex is installed, MUX is displayed as
Pass or Fail.
If the DSU, DBM, or TDM/Flex (MUX) fails this test,
follow these steps. Refer to Appendix A as you perform
the procedures described in this guide. Refer to Chapters 4
and 5 for additional examples and procedures.
6. Press the
configurations into view, and select the
appropriate configuration.
• PTPC for a point-to-point control
• PTPT for a point-to-point tributary
• MPTC for a multipoint control
• MPTT for a multipoint tributary
7. Press the F1 key to SAVE the selected
configuration.
The Save to screen appears.
8. Save the selected configuration to Activ
(F1 key).
9. Press the
then select Local again.
10. Select Test (F3).
The Run Test on screen appears.
11. Select the device that Failed: the DSU (or the
TDM/Flex) or DBM.
key to bring the factory-loaded unit
key to return to the top-level menu,
.
Procedure
1. Press the
2. Select Local (F1 key).
3. Press the
(Configuration) branch into view.
4. Press the function key directly below Confg.
5. Press the F1 key to select Opts (Configuration
Options).
The Load from screen appears.
key to return to the top-level menu.
key to scroll the Confg
12. Press the F2 key to run the Device Test again.
The device should pass.
13. Should the device fail, return the unit to the
AT&T Paradyne Repair Center (see Chapter 1).
Connecting to the Network
The DSU provides three interfaces (often called a
jack). One jack connects the DSU to the 6700 Series
NMS, one connects the DSU to the dial (or public
switched telephone network – PSTN) network, and one
connects the DSU to the DDS network. Follow the
appropriate procedure when making your network
connections.
2-53550-A2-GB20-10 February 1995
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