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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Troubleshooting
Page 6-21Network Call Transmission Level (Volume) Too Low or Too High
6
2. As necessary, note the switch identifier programmed on each system for
the trunks that carry the calls. To review a report including the switch
identifiers programmed on a system, select the
3ULQW option on the System
Programming menu and then choose
7UXQN,QIRand*HQHUDO.
3. Look for switch identifiers that incorrectly specify the distance between
systems or that specify the incorrect type of system. The diagram below
shows how switch identifiers might be programmed at either end of tandem
trunks in a hypothetical private network. A switch identifier is programmed
to identify the system at the
opposite
end of the tandem trunk. In the
example, all three switches are MERLIN LEGEND Communications
Systems. On the facility that links Systems A and B, the system managers
program identifiers to indicate that they are within 200 miles of one another.
Next to the name of each system, is the switch identifier associated with
that switch. The switch is programmed on the switches on the other end of
the tandem trunk. Systems B and C are linked by trunks whose identifiers
indicate distant systems.
The example below shows programming that would be incorrect in the
same private network. The link between Systems A and B has mismatched
identifiers, because System B specifies that System A is more than 200
miles away. System C incorrectly specifies System B as a non-MERLIN
LEGEND Communications System.
4. If any of the programming is incorrect, one or more system managers must
correct it. The coordinating system manager must clear any changes. To
change the switch identifiers at your local system, see “Switch Identifiers”
on page 19 or “UDP Facilities” in Chapter 4 of
System Programming
. If the
programming appears to be correct, skip to Step 6.
5. Make some test calls across the private network. If calls are at the proper
levels, the problem is solved. If transmission levels are still incorrect,
proceed to Step 6.
6. If the identifiers appear correct but the distance between systems is
between 180 and 220 miles, you may need to experiment with switch
identifiers in order to achieve the correct transmission levels. Return to
Step 4.
If changing one or more switch identifiers do not solve the problem,
System A
System C
System B
21
22
02
03
NY, NY
Queens, NY
Atlanta, GA
tandem
trunk
tandem
trunk
System A System CSystem B
01 21 42 03
NY, NY Queens, NY Atlanta, GA
tandem
trunk
tandem
trunk
XX