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Chapter 7. Test Menu
Menu flow is normally depicted from left to right. Arrows on the
lower right of the screen indicate the scrolling direction to view
additional menu items. At each level of the menu, pressing Cancel
returns the system to the previous menu level. Pressing Cancel
repeatedly returns the system to the Main menu.
Network Tests
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 display in the LCD window.
Executing Network Tests will disrupt normal data flow unless only
TST TS0s are selected for testing.
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).
Additionally, the loopbacks can be remotely controlled by means of
out-of-band commands by the E1 ESF FDL or from T-Watch PRO
via a modem connection.
Network Interface Loopbacks
Network interface loopbacks (see Figure 7-2 on page 7-3) affect the
entire E1 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 net-
work. 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 fram-
ing is extracted from the received data and then regenerated for the
transmitted data.
7-2
ESU 120e User Manual
61200420L1-1
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