BS-11 multidrop E1 status update

Hi! I've been experimenting for the last couple of hours with two BS-11 in a multi-drop configuration. The connection looks like this: HFC-E1 connects to BTS A Y01/Y02, just like normal. BTS-A Y03/Y04 connect to BTS-B Y01/Y02. BTS-A LI object is configured as multi-drop BTS-B LI object is configured normal (star) BTA-A is configured to use TEI 25 on TS 1 for OML (normal) BTS-B is configured to use TEI 26 on TS 10 for OML (differnt) If I put the MA-10 A-bis signal analyzer between BTS A and BTS, I can see * that the E1 physical layer is up and there are no alarms * BTS-B sends TEI requests on timeslot 10, as requested however, there is no response. Looking at TS 10 between BTS-A and BSC, I can see that there are no TEI requests or any other data. GSM 12.21 specifies a "CONNECT MULTI-DROP LINK" message, using which you can map two E1 timeslots on two interfaces to each other. I've done this (mapping port 0, TS 10 to port 1, TS 10) - but it seems the BS-11 does not support this message. The MA-10 also calls it an "unknown message". I'm Sending this message to object class 0xa5 (SiemensHW) and to the LI object in that class (object instance 7, 0, 0). The BS-11 does not respond with ACK and not with NACK. It seems it is simply ignored silently. Does anyone have an idea how to proceed? Or does anyone have an A-bis trace from a working multi-drop configuration? Thanks. -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)