OSM Service Connection User's Guide (G06.32+)

Internal Loopback Test
Tests the circuitry of a plug-in card (PIC) installed in an MSEB to determine if ServerNet traffic can pass through the
PIC.
CAUTION: Do not perform this test on a PIC that is operating normally because it will shut down ServerNet traffic
through the PIC. Also, do not perform this test on an NNA-type ServerNet PIC because the test will fail even if nothing
is wrong with the NNA PIC.
NOTE: This test fails if no device is attached to the PIC even if nothing is wrong with the PIC itself.
PIC 163