User manual

Chapter 7. Test Menu
7-2 TDU 120e User Manual 61202156L1-1
Executing tests will disrupt some of the normal operation.
See individual menu items concerning tests before executing.
Menu flow is normally depicted from left to right. At every
level of the menu, pressing
Escape
returns the system to the
previous menu level. Pressing
Escape
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 DS0s 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 T1 ESF
FDL or from T-Watch PRO by a modem connection.
Network Interface Loopbacks
Network interface loopbacks affect the entire T1 data stream.
See Figure 7-2 on page 7- 3. The two types of network
loopbacks are:
Line
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.