RAD Data comm LRS-24 Especificações descarregar pdf (Página 41)

Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics

ASM-40CD Ver. 1.0 Setting Loopback and BER Tests 4-5

4.2 Internal BERT Circuit Operation

ASM-40CD has a built-in BERT circuit consisting of a pattern generator and a

pattern tester. This circuit acts in conjunction with the V.54 diagnostic loops and

remote BERT to verify normal system operation and isolate faulty equipment in

the event of system failure. Each of the modems on the card has a separate BERT

circuit.

Activating the BER tester simultaneously activates the pattern generator, which

sends a 511-bit pattern according to the ITU V.52 standard.

If errors are detected by the BER tester, the ERR LED flashes or remains ON.

Figure 4-4

shows the data flow from the pattern generator to the pattern tester

in the local BERT circuit.

Figure 4-4. ASM-40CD BER System Test

4.3 Setting Loopback and BER Tests

The Modem Diagnostic menu (

Figure 4-5

) provides information on diagnostic

options and enables you to set loopback connections and to test the BER. The

BER can be evaluated over a portion or the entire transmission system, using

either the built-in BERT circuit or external equipment.

 To initiate a loopback and BERT:

• Type: NODEnn DEF TST <Enter>.

The Modem Diagnostic menu appears (see

Figure 4-5

nn is slot number, from 1 to 12.

Note

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 75 76

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RAD Data comm LRS-24 Especificações Página 41