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Chapter 1. Introduction
61200.076L2-1 TSU 600 User Manual 17
TSU 600 TESTING
The TSU 600 offers three forms of testing:
• Self test
• Loopback tests (local and remote)
• Pattern generation and check
Self Tests
The self test checks the integrity of the internal operation
of the electronic components by performing memory
tests and by sending and verifying data test patterns
through all internal interfaces. Although actual user
data cannot be passed during these tests, the self test can
be run with the network and DTE interfaces in place and
will not disturb any external interface.
The memory portion of the self test automatically
executes upon power up. A full self test can be com-
manded from a front panel menu or from T-Watch.
In addition to the specified self tests, background tests
are also run on various parts of the internal electron-
ics. These run during normal operation to confirm
continued correct functioning. The background tests
include: (1) monitoring the phase locked loop for lock,
(2) sending test data through a parallel path which is
looped back and verified, and (3) the standard back-
ground network performance monitoring, as required
by ANSI T1.403 and AT&T 54016 specifications for
which the results are stored.
Loopback Tests
A number of different loopbacks can be invoked
locally from the front panel, by T-Watch commands, or
remotely by using special in-band codes (AT&T D4
network loop up and loop down codes; V.54 loop up/
loop down codes for the Nx56/64 serial interface).
Additionally, the loopbacks can be remotely controlled
by means of out-of-band commands by the T1 ESF
FDL or from T-Watch by a modem connection.