ADTRAN DSU IV ESP, User Manual

Page: 116 / 194

Chapter 13. Testing and Troubleshooting
13-8 DSU IV ESP User Manual 61204011L1-1
LOCAL UNIT DIAGNOSTICS
The local DSU IV ESP can perform six different tests as described in
Table 13-3.
The test patterns shown in Table 13-4 on page 13-9 are available for
the DTE with Test Pattern and Test Pattern tests.
Table 13-3. Test AT Commands
Front Panel Display AT Command Description
DTE & Loop (LL) &T10 TD/TD and TX/TX Loopbacks
Loop Only (RT) &T11 RX/TX Loopback at Network Interface
DTE Only &T1 TX/RX Loopback at DTE Interface
DTE with TP &T8 TX/RX Loopback with Test Pattern
Test Pattern &T9 Transmit/Receive Test Pattern
Self Test Z Check internal components (Resets unit)
Exit Test &T0 Stops test, returns to data mode
TD = Customer Transmit Data
RD = Customer Receive Data
TX = Network Transmit Data
RX = Network Receive Data