Black Box CSU/DSU Especificaciones descargar pdf (Pagina 78)

CHAPTER 12: Testing and Troubleshooting

remote unit is error free. Run the test using all available test patterns.

NOTE

If an external BERT tester is available, these additional tests may be

performed:

• DTE & Loop Test

• DTE Only Test

• Loop Only Test

If the unit fails any of these tests or the problem has not been determined, contact

Black Box.

12.3 Local Unit Diagnostics

The local CSU/DSU MS DBU can perform six different tests; see Table 12-3.

Table 12-3. Test AT Commands

Front-Panel Display AT Command Description

DTE & Loop (LL) &T10 TD/RD and RX/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

The test patterns shown in Table 12-4 are available for the DTE with Test Pattern

and Test Pattern tests.

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Black Box CSU/DSU Especificaciones Pagina 78