Nokia InSite configuration check

Dear members, In connection with the problem I found, I kindly ask someone, to please check my configuration, because I want to rule out any configuration related issue, don't want to waste anyones time with sending false bug reports. Currently I am using a GSM1800 Nokia InSite unit with a Dahdi E1 card and OpenBSC, the DAHDI card is the timing source. /etc/dahdi/system.conf span=1,0,0,ccs,hdb3,crc4 bchan=2-31 dchan=1 OpenBSC conf: password foo line vty no login e1_input e1_line 0 driver dahdi network network country code 1 mobile network code 1 short name OpenBSC long name OpenBSC mm info 1 timer t3101 10 timer t3113 60 bts 0 type nokia_site band GSM1800 cell_identity 1 location_area_code 1 base_station_id_code 63 training_sequence_code 7 ms max power 40 periodic location update 10 oml e1 line 0 timeslot 5 sub-slot full oml e1 tei 1 trx 0 arfcn 885 nominal power 22 max_power_red 0 rsl e1 line 0 timeslot 4 sub-slot full rsl e1 tei 1 timeslot 0 phys_chan_config CCCH+SDCCH4 e1 line 0 timeslot 2 sub-slot 0 timeslot 1 phys_chan_config TCH/F e1 line 0 timeslot 2 sub-slot 1 timeslot 2 phys_chan_config TCH/F e1 line 0 timeslot 2 sub-slot 2 timeslot 3 phys_chan_config TCH/F e1 line 0 timeslot 2 sub-slot 3 timeslot 4 phys_chan_config TCH/F e1 line 0 timeslot 3 sub-slot 0 timeslot 5 phys_chan_config TCH/F e1 line 0 timeslot 3 sub-slot 1 timeslot 6 phys_chan_config TCH/F e1 line 0 timeslot 3 sub-slot 2 timeslot 7 phys_chan_config TCH/F e1 line 0 timeslot 3 sub-slot 3 My main concern is about the OML and RSL TEI addresses. If I understand it correctly, OML TEI identifies the BTS, RSL TEI identifies the TRX of that BTS. So if I have 2 BTSs and 2-2 TRXs, then the correct configuration would be looking like this: BTS0: oml: te1 1 trx0: tei 1 trx1: tei 2 trx2: tei 3 .... BTS1: oml: tei 2 trx0: tei 1 trx1: tei 2 trx2: tei 3 ... ? Even the Nokia BTS commissioning documentation is unclear about the specifics: sapi =Service access point identifier. (62 for OMUSIG, 0 for TRXSIG.) tei =Terminal end point identifier. Must the same as defined in the BTS. Usually the same as the TRX number. For OMU link, the value is 1. According to this, every OML TEI of every BTS should be "1" ? The other funny part is, that it sais it must be the same as defined in the BTS, but Nokia BTS Manager does not have any parameter for TEI or SAPI to set. My other concerns are BSIC and Training Sequence Code (TSC). As I know, BSIC identifies the BTS in a location and/or routing area, it means that a location/routing area can have 64 BTSs at top (BSIC=0-63), and every BTS have to use unique BSIC in the same LAC? TSC is another mystery. Nokia Docs sais: train_seq = Training sequence code. (eg. BCC value of the BSIC, eg. 7) This has to be 7 all the time, or if I have more than one BTS (in the same LAC and on the same E1)I have to change this? Finally, DAHDI configuration: How many D channels should I specify? For example if I have 2 BTSs on the same E1, I have to specify two D channels for every OMUSIG timeslots? Or I have to specify D channels for every timeslots I use for signalling (OMUSIG and TRXSIG for all BTSs)? Or maybe I don't have to allocate even one D channel, because I dedicate separate signalling and TCH timeslots for every BTS? I searched a lot about this topic, but the information available is limited, not specific and most of the time lead to more questions... I hope someone can enlighten me in this topic. BR, Csaba