FMUX/S-4E1-E2 Multiplexer
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Copyright © 2007 Cronyx
23
When working with the BER tester the following two options should be considered.
1. Link testing via the remote loop. A BER tester is enabled on the local device, and a loop
directed towards the link is enabled on the remote device:
AIS
AIS
AIS
Local multiplexer:
BER tester enabled,
AIS output to all E1 ports
TST indicator on, LERR indicator on
on errors
Remote multiplexer:
loop on the optical link enabled,
AIS output to all E1 ports,
TST indicator flashes regularly,
LERR indicator on
BERT
AIS
AIS
AIS
AIS
AIS
AIS
..
.
..
.
2. BER testers are enabled in both directions. BER testers are enabled on the local and the
remote device (such configuration allows separate measurements of link error rates in
both transmission directions):
Local multiplexer:
BER tester enabled,
AIS output to all E1 ports
TST indicator on, LERR indicator on
on errors
BERT
BERT
AIS
AIS
AIS
AIS
AIS
AIS
..
.
..
.
Remote multiplexer:
BER tester enabled,
AIS output to all E1 ports
TST indicator on, LERR indicator on
on errors
