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Feature #5436

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BRI variant of OCTOI protocol

Added by laforge 5 months ago.

Status:
New
Priority:
Low
Assignee:
Category:
protocol-spec
Target version:
-
Start date:
01/30/2022
Due date:
% Done:

0%


Description

right now the protocol is rather E1-centric, or at least assuming that timeslots always have the same bitrate.

For BRI we have
  • 2x64k B-channels (exposed to the user)
  • 1x16k D-channel (exposed to the user)
  • additional management channels (not exposed to the user, normally handled in the NT)

We need to find a way to express BRI in our protocol.

Misc note: DAHDI exposes the 2xB+1xD as three channels. Not sure if the D-channel runs at a non-8kHz rate, or if it simply only uses 2 bits of every byte?

The header/packet protocol overhead of course becomes even higher (proportionally) compared to PRI.


Related issues

Related to OCTOI - Osmocom Community TDM over IP - Feature #5417: S/T (S0) ISDN BRI adapter with VCXO / GPS-DOIn Progresslaforge01/24/2022

Actions
Actions #1

Updated by laforge 5 months ago

  • Related to Feature #5417: S/T (S0) ISDN BRI adapter with VCXO / GPS-DO added
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