Black Box LDM-MR128 Digital Modem Manuals

Manuals and User Guides for Black Box LDM-MR128 Digital Modem. We have 1 Black Box LDM-MR128 Digital Modem manual available for free PDF download: User Manual

Black Box LDM-MR128 User Manual

Black Box LDM-MR128 User Manual (40 pages)

256-Kbps V.35 Line Driver

Brand: Black Box | Category: Network Router | Size: 0.31 MB

Table of Contents

Table of Contents
5
1 Specifications

6
2 Introduction

8
- Physical Description
  8
- Functional Description
  9
  - Encoder Modulator
    10
  - Modulation Timing
    10
  - Signal Levels
    10
  - Receiver
    11
  - Diagnostics
    11
  - Test-Pattern Generator and Receiver
    11
- Applications
  12
3 Installation

15
- Installation in 19-Inch Racks
  20
  - Installing a Single Unit in a 19-Inch Rack
    20
  - Installing Two Units in a 19-Inch Rack
    20
- Connecting Data Cables
  23
  - Power Connection
    25
  - LINE Connection
    26
  - DTE Connection
    27
4 Operation

28
- Controls and Indicators
  28
- Operating Procedure
  30
5 Troubleshooting

31
- Loop Tests
  31
- Bit-Error-Rate Tester (BERT)
  31
- The Modem Self-Test
  33
- Local Analog Loopback
  34
- Remote Digital Loopback
  35
- Local Digital Loopback
  36
- Calling Black Box
  38
- Shipping and Packaging
  38
Appendix: Maximum Distances

39

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