Northern Telecom DMS-100 Series Maintenance Manual page 157

manually implement this test, then the condition of the ENET is not
important. If the ENET is ManB, then the system REX test will not test that
node.
The system implements this test after the DMS-Core component and the
DMS-Bus component complete the REx tests. The system must implement
this test before the XPM starts to test. The system performs the REX test for
each plane. The system tests only one plane each day. If the plane correctly
completes the test, the system tests the other plane the next day. If the plane
does not complete the test, the system repeats the test on the same plane.
The REx test consists of two tests: a node out-of-service and a matrix test.
Node out-of-service test
The node out-of-service test causes the ENET shelf to go SysB, unless the
ENET shelf is already SysB. This test performs a node reset test for each
message switch (MS) line on that node. This test verifies that each ENET
shelf C-side link can synchronize with the MS.
Matrix test
This REx matrix test is the same as the matrix test but there is also a test that
verifies the pseudo-random data checker. This additional test verifies that
the pseudo-random data checker and generator on each bus interface are
working. The system inserts the pseudo-random data errors into the data
stream, and checks the other bus interfaces on the bus to verify that the
interfaces observed the errors. Perform this test as an additional test within
the vertical and horizontal bus tests.
Product specific test tools
This section describes test tools for the DSNE and ENET.
Double shelf network equipment tools
This section describes the product specific test tools for the DSNE.
Integrity check traffic simulator (ICTS)
The integrity check traffic simulator test tool is available in feature package
Switch Path Diagnostics (NTX885AB). The integrity check traffic
simulator assists in speech path maintenance. The simulator identifies paths
that have defects caused by hardware components. The integrity check
traffic simulator uses call processing resources. To simulate traffic, the
simulator sets up connections on call paths between networks and the PMs
associated with them. After the system reports integrity failures, the PMs
involved in the connections continuously check integrity on the same plane.
Because the system increments integrity counters at each check, large
integrity counts identify the paths that have faults.
Problem isolation and correction 8-21
DMS-100 Family Networks Maintenance Guide BASE10