E1 interface, layer 2

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Harald Welte laforge at gnumonks.org
Tue Mar 10 19:54:15 UTC 2009


On Tue, Mar 10, 2009 at 03:24:00PM +0100, Klaus-Peter Junghanns wrote:
 
> i am staring at the sources right now, figuring out how openbsc uses 
> which part of misdn to send/receive frames over the e1 link. I think
> it's doing something like this (please correct me if i am wrong:

i hope it's not too hard to figure it out, the e1_input abstraction makes
it a bit more difficult than it used to be.

> - use timeslot 1 in hdlc mode for the signalling link

yes.  And use a number (minimum: two) DLC's with each their own pair of
SAPI/TEI.

> - use misdns layer 2 to handle the TEI assignment, etc

yes.

> What i am wondering about is:
> - which ETSI standard describs layer 2 for GSM abis?

it's gsm 08.56 (ETSI TS 100 595).  you also might want to look at 
08.51 / 08.52 and 08.54.

-- 
- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
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