EXP-INTF (Expansion Interface Circuit Pack)
Issue 1 May 2002
8-793555-233-143
Expansion Interface 2-Way Transmission
Test (#241)
This test is nondestructive. The EI 2-way transmission test is a basic connectivity
test between two PNs. The test first sends dialtone from the cabinet of the EI
circuit pack under test through the Center Stage Switch, through the DS1 CONV
circuit packs, and through another EI circuit pack to a tone detector in the other
cabinet. The connections are then reversed and the tone is passed in the
opposite direction. If the system is equipped with a Center Stage Switch, and this
test either fails or aborts with the above connection, a second PN is chosen (if one
is available and the EI circuit pack is In-Service) and the same test is run on this
new connection. This helps in the isolation of the fault. Since two EI circuit packs
are involved in the connection, either one of them could be at fault and this
repeated test can help determine which one is actually at fault.
The path used in this test is represented in Figure 8-40.
Figure 8-40. Two-Way Circuit Switch Transmission Test
Clock
Clock
Tone
Tone
Tone
Tone
TDM BUS (PN Y) TDM BUS (PN X)
CSS
(Optional)
EXP-INTF EXP-INTF
Detector
Detector
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