layer3 messages questions

Harald Welte laforge at
Fri Apr 1 09:14:30 UTC 2011


On Fri, Apr 01, 2011 at 12:51:05AM -0700, eisencah eisenach wrote:

> One question : are there any layer 3 messages that would span across multiple
> LAPDm frames?  Or are they chosen such that this never happens?

'normally' it does not happen, i.e. for regular voice / sms operation.  But
there is no guarantee for that.

However, I believe in the context of RRLP or other LCS related procedures, they
may very well happen.

It is our experience that not even all BTSs on the network side support LAPDm
fragmentation/reassembly - so it may be safe to assume that it is not any
different for phones.

- Harald Welte <laforge at> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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