Multitech MMH900, User Manual

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Chapter 6 - Operating Procedures
7.1 Introduction
The MultiMux is designed to make it easy to operate and maintain. The
procedures in this chapter will help isolate any problems you have to a
specific component of your network, at which point you will be instructed
to call the appropriate personnel or execute commands to adjust
operating conditions.
There are no specific repair procedures besides command execution
and switch settings that you are expected to perform in MultiMux
maintenance.
An important part of the MultiMux design is its remote diagnostic
capabilities. Our Tech Support department personnel can dial-up your
MultiMux through the command modem and execute special diagnostics
that will help find problems fast. When you’re stuck on a problem, do not
hesitate to Technical Support for help. Our staff may have encountered
your problem before and can help you quickly. See Chapter 8 of this
manual.
7.2 Importance of Composite Statistics
The Composite Link Status Command AT#S0 provides additional
information concerning the operation of your composite link that can aid
you in testing for problems. The composite report generated by this
command can be very valuable when used in conjunction with Analog
Loopback testing. For example, if your REMOTE DWN indicator is on,
you could run an Analog Loopback test to make sure the failure is not in
the MultiMux. If the test runs correctly, you then can check the composite
statistics for additional information.
The data in the composite status report will tell you more about line
failure conditions. The following items are on your composite status
report:
ELAPSED TIME : 00 DAYS 00 HRS 00 MIN.
BLOCKS TRANSMITTED : 0
RETRANSMITS : 0
BLOCKS RECEIVED : 0
RECEIVE BLOCK ERRORS : 0
LINK ALARMS : 0
REMOTE DOWNS : 0
RECEIVE FLOW CONTROL TIME : 00 HRS 00 MIN 00 SEC.
AUTOMATIC REPORTING : OFF 9600 BAUD
Comparing the number of blocks transmitted with the number of