DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1559SW-CTL (Switch Control)
9
Switch Control-Channel Transmission Test (#94)
Control channel messages are sent from the SPE to selected port circuit packs
and the response from the port circuit packs is checked. This tests the ability of
the Switch Control to send and receive messages on the control channel of the
TDM bus.
For the case when the system is equipped with the High Reliability or Critical
Reliability configuration, this test cannot run on the Switch Control in a standby
SPE. However, this test may have run and failed while the Switch Control was on
the active SPE which will alarm the Switch Control and cause an SPE
FAIL The Switch Control could not be successfully reset. If the system is equipped
with the Standard Reliability configuration, you will probably not be able to
make or receive calls involving telephones connected to the Processor Port
Network.
1. This failure could be due to either a MSSNET circuit pack hardware failure
or the loss of system timing signals. If the Switch Control is alarmed, then a
MSSNET circuit pack failure should be suspected. If the Switch Control is
not alarmed, then investigate the possibility of the loss of system timing
signals. See “TDM-CLK”. A TDM Bus Clock problem may cause many port
circuit pack red LEDs to light. If only the MSSNET circuit pack LED is lit,
suspect the MSSNET circuit pack. If many port circuit pack red LEDs are
lit, suspect a TDM Bus Clock problem. Test #92 and Test #94 run as part of
the test sequence for the test switch-control C command (where C
represents the carrier location of the circuit under test). Both tests will fail if
the system timing signals are lost. If test #94 passes, then do not suspect
the loss of timing signals. If the MSSNET circuit pack is determined to be at
fault, proceed to step 2.
2. If the system is still able to process calls, replace the MSSNET circuit pack
during a time that would cause the least service disruption. If the system is
equipped with the High Reliability or Critical Reliability Configuration this
can be done immediately since a MSSNET circuit pack on the standby
SPE can be replaced without affecting service. The procedure for
replacing the MSSNET circuit pack is described in ‘‘Replacing SPE Circuit
Packs’’ in Chapter 5.
3. If calls cannot be made, then replace the MSSNET circuit pack
immediately. The procedure for replacing the MSSNET circuit pack is
described in ‘‘Replacing SPE Circuit Packs’’ in Chapter 5.
PASS The Switch Control has initialized correctly. Look at results of the other tests to
see if it is operating correctly.
Table 9-592. TEST #93 Switch Control Reset Test — Continued
Error
Code
Tes t
Result Description/ Recommendation
Continued on next page
