can be problems in the exchange, lose connections to the switch or any number of things. what's the alarm given next to the DSBL? that gives a good idea of the fault.
the switch basically counts up the error's until it reaches a set threshold in a set time and then dis's the circuit. these are defined in LD74.
DDSL 82
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ALRM TBF 05(S) 00(H) 01
FAE 02(S) 01(H) 04
HER 01(M) 01(H) 10
TSF 00(S) 00(H) 00
AIS 01(M) 01(H) 04
LOI 00(S) 00(H) 00
DAI 01(M) 01(H) 05
It's not getting any smarter out there. You have to come to terms with stupidity, and make it work for you.
Ideally if they've been down for a while, both ends should be started at the stame time 'A & B' end so Its wise to touch base with your provider of this circuit, just in case it doesn't establish on 'start up'
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