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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-682EXP-INTF (Expansion Interface Circuit Pack)
10
Expansion Interface Lightwave Transceiver Loop
Around Test (#242)
This test is destructive and requires that the Expansion Interface circuit
pack first be busied out. Busying out an Expansion Interface circuit pack
denies service to the EPN if the Expansion Interface circuit pack supports a
PPN to EPN link and duplicate Expansion Interface Links are not in use. If
the Expansion Interface circuit pack is part of an EPN to EPN link, service
between the two EPNs are denied if duplicate Expansion Interface links are
not in use. This test is NOT DESTRUCTIVE if the Expansion Interface circuit
pack to be busied out is in Standby Mode.
This is a two part connectivity test. The first portion of the test applies to both
TN776 and TN570 Expansion Interface circuit packs. In the first part of the test, a
test tone is transmitted from the cabinet of the Expansion Interface circuit pack
under test, through the Expansion Interface circuit pack under test, out to its
lightwave transceiver. The connection then loops back into the lightwave
transceiver through the same Expansion Interface circuit pack again and into the
originating cabinet. If the test tone is detected by a tone detector, the first part of
the test passes.
The second portion of the test applies only to the TN570 Expansion Interface
circuit pack. In this part of the test, a data packet is sent from the TN778 Packet
Control circuit pack to the Expansion Interface circuit pack under test; the packet
is then looped back through the lightwave transceiver and sent back to the
Packet Control circuit pack. If the Packet Control circuit pack receives the same
packet it transmitted, the second part of the test passes. If the entire test has
passed, the Expansion Interface circuit pack, its backplane wiring, and the
electrical portion of the lightwave transceiver are healthy.
NOTE:
When the Expansion Interface circuit pack under test is an EPN, the data
packet must also pass through the Active Expansion Interface circuit packs
of the Active link connecting the EPN to the PPN.
This test requires the Expansion Interface circuit pack to ignore incoming data
from its neighbor Expansion Interface circuit pack on the opposite end of the
fiber. Thus, this test disturbs any inter-cabinet connections that currently exist
and disrupts signaling between the two cabinets.