In gprs ,there is only two thing is mandotary to workout..
1. gb link betwenn bsc and SGSN
2. Gs link between msc and SGSN
in gb link there is also Gd link we have to define which is for data part and there is one link which is for signalling between bsc and SGSN it is Gd link with Lapd protcol.and anothere thing is that for every bsc u have to give DLCI which is same at both end bsc and SGSN…and most important is on which timeslot u r defining gb link must be same at SGSN side.
if more query then ask.