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Chapter 1. Introduction
61200060L1-1 TSU User Manual 1-11
TSU Testing
Currently the TSU offers three forms of testing.
•SelfTest
•LoopbackTests
• Pattern generation and check
Self Tests
The self test checks the integrity of the internal operation of
theelectroniccomponentsbyperformingmemorytestsand
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 self test automatically executes upon power up. It can
also be commanded from a front panel menu or from the
control port.
In addition to the specified self tests, background tests are
also run on various parts of the internal electronics. These
will run during normal operation to confirm continued
correct functioning. The background tests include; 1)
monitoring the phase locked loop for lock, 2) the standard
background network performance monitoring, as required
by ANSI T1.403 andAT&T 54016 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 inband codes (AT&T D4 network loop up and
loop down codes; V.54 loop up/loop down codes for the
Nx56k/64k serial interface). Additionally the loopbacks can
be remotely controlled by out-of-band commands via the T1
ESF FDL, or from T-WATCH via a modem connection.