Black Box Modem MD885A-R3 Manual de usuario Pagina 124
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7.0 Diagnostics
7.7.5 E
XTERNAL
A
NALOG
L
OOPBACK
S
ELF
-T
EST
(ALXST)
The external analog loopback self-test is available for 4-wire leased line mode
only.
The ALXST places the modem in analog loopback and causes data to be sent
and received by an internal 511-bit pattern generator and receiver. No DTE
or external BERT is necessary. As shown in Figure 7-4, the test circuit includes
the leased lines (the external loopback).
NOTE
The ALXST may result in errors or may fail altogether even where
conditions are satisfactory for normal operation. The test channel
presented to the modem during the ALXST includes all impairments of
both the inbound and outbound channels (amplitude distortion, delay
distortion, noise, etc.). The main purpose of the ALXST is to verify that
the modem is connected to the leased-line and the leased line circuit is
complete. The test is not meant to assess the suitability of the leased
line.
Figure 7-4. External Analog Loopback Self Test (ALBST).
TRANSMITTER
PATTERN
GENERATOR
RECEIVER
PATTERN
DETECTOR
- Modem 34336 1
- FCC Information 2
- INDUSTRY CANADA 2
- Table of Contents 3
- Table of Conents 6
- 1.0 Specifications 7
- 1.0 Specifications 8
- 2.0 Quick Start 9
- 2.0 Quick Start 10
- 2.3 Quick Setup 14
- 2.4 Basic Operation 17
- 2.5 Problem Solving 26
- 3.0 Modem Setup Options 28
- 3.0 Modem Setup Options 30
- 3.3 Options 32
- 4.0 General Operation and 55
- Special Features 55
- 4.4 Dial Line Auto-Recovery 59
- 4.5 DTR Dialing 60
- 4.7 Modem Security Operation 63
- Table 4-2. Password Commands 64
- ONTROL THROUGH A 68
- ONTROLLER 68
- 9600 bps or higher 72
- ESPONSES TO 74
- IAGNOSTIC 74
- ISCONNECTING 76
- 4.10 Automatic Fallback 77
- 4.11 V.13 Operation 81
- 5.0 Hayes Emulation Mode 82
- 5.2 Hayes Compatible Commands 85
- 5.3 S Registers 91
- 5.0 Hayes Emulation Mode 100
- 6.0 V.25 bis Autodialer 108
- 6.3 Dialing Parameters 113
- 6.4 V.25 bis Result Codes 113
- 7.0 Diagnostics 114
- 7.3 Physical Inspection 115
- 7.0 Diagnostics 116
- 7.7 Local Modem Diagnostics 119
- 7.8 Remote Modem Diagnostics 127
- See notes on page 127 132
- See notes on next page 134
- Appendix C: Summary Setup 136
- Primary Options: 139
- Dial Line Options: 139
- EIA INTERFACE OPTIONS: 139
- V.42 ERROR CORRECTION OPTION: 140
- LEASED LINE OPTIONS: 140
- DATA PUMP OPTIONS: 141
- MISCELLANEOUS OPTIONS: 142
- C.3 AT PROFILES Screen 143
- C.4 S-REG Screen 144
- Appendix D: Jumpers 145
- Appendix D: Jumpers 146
- NOM Statement 148
- ELECTRICAL SAFETY STATEMENT 148
- INSTRUCCIONES DE SEGURIDAD 148
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