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C Loopback Tests
87
MultiModemII User Guide
Appendix C: Loopback Tests
Introduction
Each time you turn on your modem, it performs an automatic self-test to ensure
proper operation. Your modem also has three diagnostic tests: local analog loop-
back, remote digital loopback, and local digital loopback. These ITU-T V.54 loop-
back tests isolate telephone circuit and transmission problems.
In a loopback test, data from your computer loops through the circuits of your mo-
dem and/or a remote modem before it appears on your monitor. When the loop has
been completed, the data on your PC’s monitor should match the original data.
The local analog loopback test allows you to verify that the modem’s transmitter
and receiver circuits are functioning properly.
The remote digital loopback test allows you to verify that the local computer or ter-
minal, the serial ports, the local and remote modems, and the transmission line be-
tween them are functioning properly.
The local digital loopback test allows you to verify that the remote computer or ter-
minal, the serial ports, the local and remote modems, and the transmission line be-
tween them are functioning properly.
Note: All loopback tests should be run at 9600 bps without error correction.
Local Analog Loopback Test (V.54 Loop 3)
In this test, data from your computer or terminal is sent to your modem’s transmit-
ter, converted into analog form, looped back to the modem’s receiver, converted into
digital form, and then sent to your monitor for verification. No connection to the
phone line is required.
Com
p
uter or Terminal
Digital Analog
AT&T1
CONNECT 9600
UUUUUUUUUUU
UUU
Local MultiMode
m
Figure C-1. Local analog loopback test.
Test procedure
1. Connect the modem to your computer. Using your communication program, set
the desired baud rate and go into terminal mode.
- Model MT5600BA 1
- Model MT5600BL 1
- FCC Part 15 3
- Industry Canada 3
- Chapter 1: Introduction 4
- Chapter 2: Installation 4
- Chapter 6: Callback Security 5
- Chapter 8: Solving Problems 5
- Contents 6
- Product Description 8
- Features 8
- 1 Introduction 9
- Related Manuals 10
- What You Will Need 12
- Safety Warnings 12
- RS232 Connection 13
- Dialup Connection 13
- 2 Installation 14
- Installing the ModemDriver 15
- Removing an Old Modem Driver 15
- Using the 17
- Front Panel 17
- Modem Configuration 18
- LED Indicators 18
- Liquid Crystal Display (LCD) 19
- 3 Using the Front Panel 20
- Menu Overview 20
- Status Trunk 21
- Basic Options Trunk 22
- Advanced Options Trunk 24
- Diagnostic Options Trunk 26
- Caller ID Options Trunk 27
- Menu Options 28
- Basic Options 29
- Advanced Options 31
- Remote Configuration Options 33
- Diagnostic Options 33
- Phone Number Memory Options 33
- Caller ID Options 34
- AT Commands 35
- S-Registers & 35
- Result Codes 35
- S-Registers 54
- Configuration 62
- Basic Procedure 63
- 5 Remote Configuration 64
- Callback 65
- Security 65
- AT Command Method 66
- Front Panel Method 67
- At Command Method 68
- Calling Procedure 69
- Callback Security Commands 70
- Callback Assignments Form 71
- Leased Line 72
- Operation 72
- Two-Wire Setup 73
- Four-Wire Setup 74
- 7 Leased Line Operation 75
- Problems 77
- None of the Indicators Light 78
- 8 Solving Problems 79
- Data Is Being Lost 83
- Appendixes 85
- FCC Part 68 Telecom 86
- Fax Branding Statement 87
- Canadian Limitations Notice 88
- A Regulatory Compliance 89
- South African Notice 90
- B Technical Specifications 91
- Appendix C: Loopback Tests 93
- Test procedure 94
- C Loopback Tests 95
- Back-to-Back Test 96
- Ordering Accessories 99
- Technical Support 100
- Internet Sites 100
- Introduction 101
- Upgrade Overview 101
- E Upgrading the Modem 102
- MultiModemII User Guide 102
- Installation 104
- Calling the ISP 105
- Answering Calls 105
- Appendix G: Pin Descriptions 106
- RS-232 Cable Pinouts 107
- Leased Line Pinouts 108
- H ASCII Character Map 109
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