Comdial DXP Plus Manual page 336

Troubleshooting The DXPT1 Digital Carrier Transmission Option
On The DXP Plus Digital Communications System
What This Document Contains
1. Defining The T1 Terms 2
1.1 Introducing The DXPT1 6
1.2 Describing The Channel Service Unit (CSU) 6
1.3 Considering Pre-Installation Details 7
2. Troubleshooting The Physical Layer 8
2.1 Selecting Functions With DIP Switches SW1-1 Through SW1-8 8
2.2 Selecting Functions With DIP Switches SW2-1 Through SW2-8 8
2.3 Selecting Functions With DIP Switches LIU-1 Through LIU-4 9
2.4 Setting Up The DXOPT-SYN (Sync) Card 9
3. Troubleshooting The Protocol Layer 10
3.1 Defining The Signalling Bits For The E & M Protocol 10
3.2 Defining The Signalling Bits For The Direct Inward Dial (DID) Protocol 11
3.3 Defining The Signalling Bits For The Ground Start Protocol 11
3.4 Defining The Signalling Bits For The Loop Start Protocol 12
4. Using The Diagnostic Function 13
4.1 Understanding The Diagnostic Switches And Indicators 13
4.2 Requesting Cold Start Information 14
4.3 Requesting Information On Received Signal Strength 15
4.4 Requesting Information On Switch Settings 16
4.5 Requesting AB Signalling 17
4.6 Requesting Information On Trunk Assignments 18
4.7 Requesting Information About Channel State 19
4.8 Using The Hexadecimal Codes For Remote Diagnostics 20
5. Selecting The T1 PAD Settings 21
5.1 Setting T1 Transmit Level 21
5.2 Setting T1 Receive Level 21
6. Solving T1 Problems 21
A. APPENDIX A (Superframe and Extended Superframe Formats) 22
Referring To Other Documents
Installing The DXPT1 Digital Carrier Transmission Option, IMI89-193
Carrier-To-Customer Installation DS1 Metallic Interface, ANSI T1.403-1989
Private Branch Exchange (PBX) Switching Equipment for Voiceband Applications, 4.10 "Digital
Signaling and Supervision", EIA/TIA-464A
This manual has been developed by Comdial Corporation (the "Company") and is intended for the use of its customers and service personnel. The information in this manual is subject to change
without notice. While every effort has been made to eliminate errors, the Company disclaims liability for any difficulties arising from the interpretation of the information contained herein.
The information contained herein does not purport to cover all details or variations in equipment or to provide for every possible contingency to be met in connection with installation, operation, or
maintenance. Should further information be desired, or should particular problems arise which are not covered sufficiently for the purchaser's purposes, contact Comdial, Inside Sales Department,
Charlottesville, Virginia 22906.
Printed in U.S.A.
R
IMI89-207.01
7/95