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Feature #4910
closedAutomatically set the A / alarm bits in Tx if no signal on Rx
Start date:
12/16/2020
Due date:
% Done:
0%
Spec Reference:
Description
At least according to one of my German retronetworking books on PDH it is stated that an E1 interface must set the A[larm] bit in TS0 if no received signal is detected.
I expect we don't do that yet as we have no real concept of LOS.
Relying on the host software to insert that A bit is not really a good idea, as the host has the least idea of what's happening on the physical layer.
So I would guess, similar to the way how we automatically can generate the E bits in case of Rx CRC errors, it would be good to generate the A bits based on whether or not we see incoming Rx clock cycles.
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