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Communication Manager Maintenance-Object Repair Procedures
560 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
ATM Board Framer Loop-Around Test (#1260)
This test is destructive.
Note:
Note: This test can be run on the standby PNC only if the board is busied out.
This test places the ATM circuit pack in ATM framer loop-around mode. Once the board
receives this message, it creates a dummy virtual circuit that originates and ends on the same
board, without leaving the board. This test verifies both the TDM path and the Packet Path. If
the TDM test path passes, then the packet path is tested. Definitions of each test path are:
● The circuit (TDM) path: one of the Tone Generators sends a bit pattern through a TDM
bus time slot to the ATM framer. The pattern is converted into ATM cells and looped back
to the ATM-EI board, which converts the cell back into the bit pattern and puts it on a
pre-determined time slot. A Tone Detector tests for the bit pattern and reports the test
result. This test verifies that a large portion of the ATM-EIs circuit paths are functioning
correctly. Figure 27: ATM Board Framer Loop-Around Test (#1260) on page 560 shows a
diagram of the test.
Figure 27: ATM Board Framer Loop-Around Test (#1260)
● Packet path: the Packet Interface circuit pack sends packet data to the ATM framer
interface, where it is mapped into ATM cells and then looped around internally. The cells
are converted back to packet data after it has been looped. This portion of the test verifies
correct operation of the ATM-EI’s packet-bus interface and a large portion of the ATM-EI's
packet paths. Figure 28: ATM Board Framer Loop-Around Test (#1260) (non-EAA,
Packet Path) on page 561 shows the packet switched signal path for the ATM circuit pack.
● This test verifies the operation of a large portion of the ATM-EI circuit and packet paths, but
does not verify the optical portion of the lightwave transceiver. If this test passes, the
ATM-EI circuit pack is functioning correctly, but faults can exist in the lightwave transceiver.
If the test fails, the fault can be on the board. After the test results are reported, the ATM
framer is taken out of loopback.
Note:
Note: This test can be run on active or standby ATM-EIs, but it is not allowed if an
ATM-EI is the Expansion Archangel.
Tone clock
Tone detector
Packet
Interface
PNC mode
ATM
framer
looped
iodftoneAWF 040699
TDM bus
(PPN)
Packet bus
(PPN)
ATM
circuit
pack