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 messag e, it creates a dummy virtual c ircuit 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 p acket
path is tested. Definitions of eac h test path are:
—
The circuit (TDM) path
: one of the tone generators sends a b it pattern
through a TDM bus time slot to the ATM framer. The pattern is converted
into ATM cells and looped bac k to the ATM-EI board, which converts the
cell back into the b it pattern and p uts it on a pre-determined time slot. A
tone detector tests for the b it pattern and reports the t est 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 circui t pack sends p acket data to the
ATM framer interface, where it is mapped into ATM cells and then loop ed
around internally. The cells are converted b ack to packet d ata after it has
been looped. This por tion of the test verifies correct op eration of the
ATM-EI’s Packet bus interface and a large port ion of the ATM-EI's packet
paths. Figure 3- 6 shows the packet switched signal p ath for the ATM
circuit pack.
This test verifies the operation of a large por tion of the ATM-EI circuit and
packet paths, b ut does not verify the optic al portion of the lightwave
transceiver. If this test passes, the ATM-EI circuit pac k is functioning
correctly, but faults may exist in the lightwave tr ansceiver. If the test fails,
the fault may lie on the board. After the test results a re reported, the ATM
framer is taken out of loopbac k.
NOTE:
This test may be run on active or standb y ATM-EIs, but it is
not
allowed if an ATM-EI is the Expansion Archangel.
Toneclock
Tonedetector
Packet
Interface
PNCmode
ATM
framer
looped
iodftoneAWF 040699
TDMbus
(PPN)
Packetbus
(PPN)
ATM
circuit
pack