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Chapter 4 Troubleshooting and Diagnostics ASM-20 Installation and Operation Manual
4-2 Bit Error Rate Tester (BERT)
PATT
Pressed
Pattern
Generator
Pattern
Tester
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
T
Pressed
Pattern
Generator
Pattern
Generator
Error
Error
XMT
RCV
Pattern
Tes te r
Pattern
Tester
REMOTE ASM-20
511
External
BERT
Figure 4-2. Two BERTs Operating End-to-End