Maintenance-Object Repair Procedures
555-233-143
8-798 Issue 1 May 2002
In the second part of the test, a data packet is sent from the TN1655 Packet
Interface circuit pack to the EI circuit pack under test, the packet is looped back
through the lightwave transceiver and is sent back to the Packet Interface circuit
pack. If the Packet Interface circuit pack receives the same packet it transmitted,
the second part of the test passes. If the entire test has passed, the EI circuit
pack, its backplane wiring and the electrical portion of the lightwave transceiver
are healthy.
The path used for this test if the EIEI resides in the PN is represented in Figure
8-42 on page 8-799. The path used for this test if the EI resides in an PNPN is
represented in Figure 8-43 on page 8-799.
When the EI circuit pack under test is in an PN, the data packet must also pass
through the active EI circuit packs and the active DS1 CONV circuit packs (and
the active SNI circuit pack(s) in a Center Stage Switch system) of the active PNC
link connecting the PN.
This test requires the EI circuit pack to ignore incoming data from its neighbor EI
circuit pack or SNI circuit pack. Thus this test will disturb any inter-port network
connections that currently exist over the link provided by the EI under test and its
neighbor and disrupt signaling between the two circuit packs.
Figure 8-41. TDM BUS Lightwave Transceiver Looparound
lightwave
To CSS or
Neighbor EI
TDMBUS (PN X)
Tone
Tone
Clock
Detector
EXP_INTF
transceiver
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