Feature #4910
closedAutomatically set the A / alarm bits in Tx if no signal on Rx
0%
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.
Related issues
Updated by laforge over 2 years ago
- Related to Bug #5381: icE1usb DAHDI driver: generate YELLOW alarm towards peer added
Updated by tnt over 2 years ago
Shouldn't the A bit be set if there we don't have alignement ? Not just complete LOS, but any condition causing us to not detect a valid framed signal ?
Updated by laforge 20 days ago
On Mon, Apr 29, 2024 at 08:45:10AM +0000, tnt wrote:
laforge ping. Any condition causing LOF should generate the alarm bits right ?
I have no idea, sorry. I am also super stressed out right now, I cannot afford any distractions
to research other topics not on my immediate super urgent agenda or I'll go crazy :/