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Harald Welte laforge at gnumonks.orgOn Thu, Jul 30, 2009 at 01:00:46PM +0200, Nordin wrote: > Hi, > > according to the wiki for the nanobts: > > * 0x00 RSL messages as per GSM 08.58 > * 0xfe ip.access specific messages > * 0xff OML messages as per GSM 12.21 > > I assume this is the so called SAPI? no. SAPI only exists in E1 based A-bis. > Cause I read some Abis articles that for RSL and OML is resp. 0 and 62. > I just want to be sure there are some value differences. A-bis over E1 is what the BS-11 uses. ip.access has their own proprietary protocol stacking and A-bis dialect. There is no public documentation about it, apart from what we deducted from protocol traces and implemented in OpenBSC / wireshark and put into the OpenBSC wiki. In any case, the Layer 2 (Q.921 on E1, with TEI and SAPI) is completely uninteresting. All you should care about is layer 3 (12.21 OML and 08.58 RSL). Whatever is below is the transport layer and does not actually have any actual impact on the GSM netwokr -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)