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DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-174ATM-EI (Expansion Interface Circuit Pack)
3
This test places the ATM circuit pack in ATM framer looparound 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 3-5
shows a diagram of the test.
Figure 3-5. ATM Board Framer Looparound 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 3-6
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 may exist in the lightwave transceiver. If the test fails,
the fault may lie on the board. After the test results are reported, the ATM
framer is taken out of loopback.
NOTE:
This test may 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