CTC Union TRM01, Руководство пользователя

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Chapter 5. Troubleshooting
27
TRM-01 APR 2000
5.1 General
As in troubleshooting any type of computer, network, or communication
problem, it is very important to follow a very logical procedure. During any
troubleshooting session, the importance of taking notes cannot be overstated. It
is very easy to forget connections or settings when troubleshooting a large
network. Notes will help in logically checking all items and will also serve as a
valuable aid in writing a system log or other report to your supervisor or your
customer following successful completion of work. Notes also serve as
important tools for future troubleshooting or for training of new personnel or
just simply as a memory refresher.
When dealing with troubleshooting of first time installation problems, the
best place to start is with double-checking of configuration settings and
connections. It is very easy to misinterpret a DIP switch setting and cause the
failure of a link. Initial configuration problems will also cause either immediate
failure or inconsistent operations. Although the
FT1 Cards all comply with ITU
G.703 recommendations, it is very important to understand the differences in
terminology between different equipment manufactures. A thorough
understanding of the settings and configuration of related equipment is
mandatory when integrating many vendors' equipment.
Having the proper tools is also important in any troubleshooting endeavor.
When troubleshooting T1 connections a transmission analyzer is an invaluable
tool in isolating configuration, line or hardware problems. CTC Union's BTM-
10 T1 Transmission Analyzer is an excellent choice. The unit is very portable,
battery operated, with built-in keyboard and LCD display. The tester is designed
to do BERT (Bit Error Rate) testing via T1 connection or via Data Port
connection at speeds up to 1.544Mbps.
5.2 Connections
When checking for connection related problems, start by looking for
physical defects in the connectors themselves. Check for broken or bent pins,
corrosion and mis-wiring. Check cables for pinching that could indicate a
broken or shorted wire. For twisted pair wiring, confirm that a wire pair actually
goes to the proper transmit or receive signal pairs. Build yourself an RJ-45
break-out-box from a pigtail converter. Loop back the pairs in the BOB and
confirm continuity with a multi-meter.