Chapter 1. Introduction
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run during normal operation to confirm continued correct
functioning. The background tests include:
•
Monitoring the phase-locked loop for lock.
•
Standard background network performance monitoring.
Loopback Tests
A number of different loopbacks can be invoked locally from
the front panel, by T-Watch commands, or remotely using
V.54 loopback code.
Network Loopbacks
There are two types of network loopbacks. See Figure 1-4.
Payload Loopback
Similar to line loopback, except that the framing is extracted
from the received data and then regenerated for the
transmitted data.
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.
Figure 1-4. Network Loopback Tests
ESU
E1
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