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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1144PR-MAINT (Maintenance Processor [TN790 RISC Systems])
10
MTP Analog Loop Around Test (#103)
This test is a nondestructive test. The test does a loop around by using the MTP
INADS channel. Test data is sent through the modem out toward the INADS
trunk. The data is looped around before the actual trunk, and it comes back into
the on-board modem. The data is then verified for integrity. The internal modem
is tested when the internal modem is selected. The external modem is tested
when the external modem is selected.
When an external modem is administered in place of the internal modem, the test
loops data in the MTP DUART ahead of the connection to the external modem.
This test also causes the MTP DUART to verify that Clear-To-Send (CTS) is
being supplied by the modem.
FAIL MTP reported test failure. No loop current detected. The following steps
apply to either an internal or external modem ( Some additional steps
apply to an external modem only).
1. Retry at 1-minute intervals a maximum of 5 times.
2. For an external modem, if the test continues to fail:
a. If Test #230 failed, use the external modem recommendations
listed in Test #230.
b. If Test #230 passes, the MTP most likely received a NO DIAL TONE
response to the ATD command sent from the MTP. This problem is
between the modem and the INADS trunk.
3. Examine the INADS trunk for connectivity, and manually check for loop
current.
4. If there is no INADS trunk, this test should be disabled. To disable the
test, issue the change system-parameters maintenance command,
and change the Test Remote Access Port field to ‘‘n.’’
5. If the INADS trunk checks out okay, but the test still fails, check the
backplane connector wiring.
6. If the backplane wiring checks out okay, replace the Processor circuit
pack.
PASS MTP detected a loop current on the remote access port.
1. If the system cannot call INADS, or INADS cannot contact the system,
check with the local Central Office for problems with the INADS trunk,
and verify that the INADS number is correct. Approved external
modems with factory default settings are expected to work if
administered correctly using the change system-parameters
command.
Table 10-337. TEST #102 MTP Outpulse Relay Test — Continued
Error
Code Test Result Description/ Recommendation
Continued on next page