RAD Data comm ASM-20 operation manual Bert Using Loops

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

PATT

P re sse d

P a tte rn

G en e rato r

P a tte rn

Teste r

E rro r

X M T

R C V

A S M -2 0

Figure 4-1 BERT Using Loops

Alternatively, the complete link can be tested when using two ASM-20 modems or an external BERT. Figure 4-2illustrates 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.

PATT

Pressed

Pattern

G enerator

Pattern

Tester

Error

LOC AL ASM -20

PATT

Pressed

RCV

Pattern

Tester

Error

XM T

Pattern

G enerator

REM O TE ASM -20

511 External

BERT

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

Bit Error Rate Tester (BERT) 4-3