ADTRAN ESU 120e user manual Network Tests, Loopback Tests, Network Interface Loopbacks

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