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ATM Board Framer Looparound Test (#1260)
This test is destructive.
ATM Board Framer Looparound Test (#1260)
Note:
Note: This test requires the board to be busied out. In a duplex system, this test can be
run on the standby ATM-EIs. In a simplex system, this test can be run only on the
ATM EI boards in the PPN.
This test places the ATM circuit pack in ATM framer looparound mode. It verifies the board’s
circuit and packet paths. 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:
● 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 is 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 149: ATM Board Framer Looparound Test (#1260) shows a diagram of
the test.
Figure 149: ATM Board Framer Looparound Test (#1260)
Tone clock
Tone detector
Packet
Interface
TDM bus
(PPN)
Packet bus
(PPN)
ATM
circuit
pack
PNC mode
ATM
framer
looped
iodftone AWF 040699
● 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 150: ATM Board Framer Looparound Test (#1260) (non-EAA, Packet
Path) 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.
This test runs on ATM-EI (Expansion Interface Circuit Pack) and ATM-TRK (Circuit Emulation
Service Circuit Pack).
Communication Manager Release 5.0 Issue 4 January 2008 1959