Rad-data-comm ASM-20 Manual do Utilizador descarregar pdf (Página 36)

Chapter 4 Troubleshooting and Diagnostics ASM-20 Installation and Operation Manual

4-2 Bit Error Rate Tester (BERT)

PATT

Pressed

Pattern

Generator

Pattern

Tes t e r

Error

XMT

RCV

ASM-20

Figure 4-1. BERT Using Loops

Alternatively, the complete link can be tested when using two ASM-20 modems or

an external BERT. Figure 4-2 illustrates the two options for testing a complete link:

• Press the PATT push button of the local modem and check the ERR/RPF LED.

At the remote side check an external BERT.

• Press the PATT push button of the local and remote modems and check their

ERR LEDs.

LOCAL ASM-20

PATT

Pressed

PAT

Pressed

Pattern

Generator

Pattern

Generator

Error

XMT

RCV

Pattern

Tes t e r

Pattern

Tes t e r

REMOTE ASM-20

511

External

BERT

Figure 4-2. Two BERTs Operating End-to-End

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Rad-data-comm ASM-20 Manual do Utilizador Página 36