Paradyne COMSPHERE 3920PLUS Series User manual

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Paradyne product document.
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AT&T. Any reference to AT&T Paradyne is
amended to read Paradyne Corporation.

April 1995
COMSPHERE
392x
Plus Modems
Models 3920
Plus and 3921 Plus
Installation and Operation Manual
Document No. 3920-A2-GN31-10
P a
r
a dyn e
Printed on recycled paper

COMSPHERE 392xPlus Modems
AApril 1995 3920-A2-GN31-10
COMSPHERE
392x
Plus Modems
Models 3920
Plus and 3921 Plus
Installation and Operation Manual
3920-A2-GN31-10
2nd Edition (April 1995)
Changes and enhancements to the product and to the information herein will be documented and issued as a new release or
a Firmware Update Description document to this manual.
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, Technical Publications, 8545 126th Ave. N., P.O. Box
2826, Largo, Florida 34649-2826. AT&T Paradyne may use or distribute any of the information supplied, as appropriate,
without incurring any obligation whatsoever.
For the 3920Plus standalone modems, the Universal Service Order Code (USOC) for Permissive mode is RJ11C. The
Canadian equivalent to RJ11C is CA11A. For 392xPlus carrier-mounted modems, the USOC for Permissive mode is
RJ21X. The Canadian equivalent to RJ21X is CA21A.
For regulatory approval, refer to the product labeling or contact your local AT&T Paradyne representative.
COMSPHERE is a registered trademark of AT&T.
DATAKIT is a registered trademark of AT&T.
IBM is a registered trademark of International Business Machines Corporation.
Microcom Networking Protocol is a registered trademark of Microcom, Inc.
Sun Workstation is a registered trademark of Sun Microsystems, Inc.
UNIX is a registered trademark of Novell in the United States and other countries, licensed exclusively through X/Open Limited.
COPYRIGHT E 1995 AT&T Paradyne Corporation. All rights reserved.
Thispublicationisprotectedby federalcopyrightlaw.No partofthispublication maybecopiedor distributed,transmitted,transcribed,stored inaretrievalsystem,
ortranslatedintoanyhumanorcomputerlanguageinanyformorbyanymeans,electronic,mechanical,magnetic,manualorotherwise,ordisclosedtothirdparties
without the express written permission of AT&T Paradyne Corporation, 8545 126th Avenue 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.

Safety Instructions
B3920-A2-GN31-10 April 1995
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.
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.

COMSPHERE 392xPlus Modems
CApril 1995 3920-A2-GN31-10
Notices
                 
              
           
             
            
              
              
  
            
             
    


      
               
            

 "  " "    " "  
   "        !  
 " ""   !    

i3920-A2-GN31-10 April 1995
Table of Contents
Preface
Objectives and Reader Assumptions vii. . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use This Manual vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documents viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Introduction
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multipoint Applications 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dual-Leased Backup Applications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
MSD Application 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Bridge Application 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392xPlus Models 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Government Requirements and Equipment Return 1-6. . . . . . . . . . . . . . . .
Equipment Warranty and Support 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Modem Installation
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Modem Package 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus Modem Installation 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
DTE Connection 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus 4-Wire/2-Wire Leased-Line Network Connection 2-4. . .
Dial Network Connection 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus Dial Backup Connection 2-4. . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus Leased Backup Connection 2-5. . . . . . . . . . . . . . . . . . . .
Network Management System Connection 2-5. . . . . . . . . . . . . . . . . . . . . .
Power Supply Connection 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modem Power-Up 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Factory Configuration Options 2-6. . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing Model 3920Plus Modems 2-8. . . . . . . . . . . . . .
Model 3921Plus Modem Installation 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing Model 3921Plus Modems 2-11. . . . . . . . . . . . . .

COMSPHERE 392xPlus Modems
ii April 1995 3920-A2-GN31-10
3. DCP Operation
Overview 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Control Panels 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Indicators 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Control Panel Operation 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu Structure 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Branch 3-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure Branch 3-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Poll List Branch 3-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Branch 3-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Branch 3-53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sub-Network Health and Status Branch 3-63. . . . . . . . . . . . . . . . . . . . . . . .
Call Setup Branch 3-64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Talk/Data Branch 3-72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Branch (Mux Disabled) 3-74. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Branch 3-75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. DCP Configuration
Overview 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure Branch 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Tables 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mux Enabled 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mux Disabled 4-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. AT Command Set and S-Registers
Overview 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Guidelines 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT Command List 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S-Register List 5-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Dial Access Security
Overview 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Branch 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Configuration Options 6-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Password Entry Techniques 6-15. . . . . . . . . . . . . . . . . . . . . . . . . . .
Database Table Examples 6-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
iii3920-A2-GN31-10 April 1995
Appendices
A. Menu Tree A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Troubleshooting B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Pin Assignments C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D. CCITT V.25bis Dialing Commands and Response D-1. . . . . . . . . .
E. ASCII Character Table E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F. Default Configuration Options F-1. . . . . . . . . . . . . . . . . . . . . . . . .
G. Sample Configurations G-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H. Equipment List H-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index

COMSPHERE 392xPlus Modems
iv April 1995 3920-A2-GN31-10
List of Figures
Figure Page
1-1 Model 3920Plus 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Model 3921Plus 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Model 3920Plus Rear Panel and Power Supply 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Installing a Model 3921Plus Modem 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Circuit Pack Lock 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Model 3920Plus DCP 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Optional SDCP and Model 3921Plus Faceplate 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 392xPlus LCD and Keypad 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Local Analog Loopback 3-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Remote Digital Loopback 3-57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6 Local Digital Loopback 3-59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7 Pattern Test and Local Analog Loopback Test 3-60. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8 Pattern Test and Digital Loopback Test 3-61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9 End-to-End Pattern Test 3-61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-10 Dial Backup 3-67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 DCP Configuration Process 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-1 VF Pin Orientation C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-2 Wiring Diagram — “Y” Cable for External Telephone C-4. . . . . . . . . . . . . . . . . . . . . . .
C-3 Wiring Diagram — 8-Position to 6-Position Crossover Cable C-5. . . . . . . . . . . . . . . . .
C-4 Wiring Diagram — 25-Position Crossover Cable C-6. . . . . . . . . . . . . . . . . . . . . . . . . . .
G-1 Sample Configuration — Point-to-Point G-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-2 Sample Configuration — Extended Point-to-Point G-4. . . . . . . . . . . . . . . . . . . . . . . . . .
G-3 Sample Configuration — Extended Multipoint G-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-4 Sample Configuration — Point-to-Point with Automatic Dial Backup G-8. . . . . . . . . .
G-5 Sample Configuration — Point-to-Point with Network Management G-10. . . . . . . . . . .
G-6 Sample Configuration — Carrier with Network Management G-12. . . . . . . . . . . . . . . . .
G-7 Sample Configuration — Extended Diagnostics G-14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-8 Sample Configuration — Digital Bridging G-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-9 Sample Configuration — Point-to-Point MSD G-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-10 Sample Configuration — Multipoint MSD G-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
v3920-A2-GN31-10 April 1995
List of Tables
Table Page
1-1 Technical Specifications for 392xPlus Modems 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Model 3920Plus and Model 3921Plus DCP LEDs 3-5. . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 SDCP LEDs 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Top-Level Menu Status 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Common Operational Messages 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Dial Access Security Messages 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6 Health and Status Messages 3-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7 Backup Status Screens 3-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8 Valid Ranges for VF Thresholds 3-52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9 Valid Dial Command Modifiers 3-71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 DTE Interface Configuration Options — Mux ENABLED 4-10. . . . . . . . . . . . . . . . . . .
4-2 Line Dialer Configuration Options — Mux ENABLED 4-19. . . . . . . . . . . . . . . . . . . . . .
4-3 Dial Line Configuration Options — Mux ENABLED 4-22. . . . . . . . . . . . . . . . . . . . . . .
4-4 Leased Line Configuration Options — Mux ENABLED 4-24. . . . . . . . . . . . . . . . . . . . .
4-5 Test Configuration Options — Mux ENABLED 4-27. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6 Miscellaneous Configuration Options — Mux ENABLED 4-28. . . . . . . . . . . . . . . . . . .
4-7 DTE Interface Configuration Options — Mux DISABLED 4-32. . . . . . . . . . . . . . . . . . .
4-8 DTE Dialer Configuration Options — Mux DISABLED 4-40. . . . . . . . . . . . . . . . . . . . .
4-9 Line Dialer Configuration Options — Mux DISABLED 4-45. . . . . . . . . . . . . . . . . . . . .
4-10 Dial Line Configuration Options — Mux DISABLED 4-49. . . . . . . . . . . . . . . . . . . . . . .
4-11 Leased Line Configuration Options — Mux DISABLED 4-52. . . . . . . . . . . . . . . . . . . .
4-12 V.42/MNP/Buffer Configuration Options — Mux DISABLED 4-57. . . . . . . . . . . . . . . .
4-13 Test Configuration Options — Mux DISABLED 4-63. . . . . . . . . . . . . . . . . . . . . . . . . . .
4-14 Miscellaneous Configuration Options — Mux DISABLED 4-65. . . . . . . . . . . . . . . . . . .
5-1 Result Codes 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 392xPlus AT Commands 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3 392xPlus S-Registers 5-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1 Edit Password Table Group Options 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Set Answer Security Group Options 6-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3 Set Originate Security Group Options 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4 Security Configuration Options 6-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-5 Security Database Table Using VF-Side Passwords 6-16. . . . . . . . . . . . . . . . . . . . . . . . .
6-6 Security Database Table Using DTE-Side Passwords 6-17. . . . . . . . . . . . . . . . . . . . . . . .
6-7 Security Database Table Using Both VF-Side and DTE-Side Passwords 6-17. . . . . . . . .
B-1 Modem Health B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-2 Leased-Line Operation B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-3 Dial Backup Operation B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-4 Modem — DTE Connection B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-5 Modem — VF Connection B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-6 Online Operation B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .