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Chapter 4. T1 Network Interface
Network Tests
4-26
Network Tests control the activation of loopbacks and the
initiation of data test patterns.
Network Tests are run on the Network Interface (NI). You
can select three different test configurations to determine the
type of loopback and the pattern to run. Test results are
displayed on the terminal screen.
Executing Network Tests will disrupt normal data flow
unless only TST DS0
Loopback Tests
A number of different loopbacks can be invoked locally from
the front panel, by T-Watch Pro commands, or remotely by
using special in-band codes (AT&T D4 network loop up and
loop down codes). Additionally, the loopbacks can be
remotely controlled by means of out-of-band commands by
the T1 ESF FDL or from T-Watch Pro by a modem connection.
See Figure 4-13 on page 4-27.
Network Interface Loopbacks
Network interface loopbacks affect the entire T1 data stream.
There are two types of network loopbacks: line loopback and
payload loopback.
Line loopback loops all of the received data back toward the
network. The transmitted data is the identical line code that
was received, including any bipolar violations or framing
errors.
Payload loopback is similar to line loopback, except that the
framing is extracted from the received data and then
regenerated for the transmitted data.
TSU 610 User Manual
are selected for testing.
S
61200610L2-1
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