Hello Csaba, On 12/1/16 11:25 PM, Sipos Csaba wrote: > Hi, > > Maybe its not completely related, but my experience with Nokia Site is to use > full E1 timeslots (64kbit) for RSL and OML signalling, otherwise it is not > working, and this is not a Nokia limitation. >
Nokia did a different implementation on Abis. I'm hoping to get a Nokia soon and play with it. > Just try using: I can't try it because I don't have a PCM based Ericsson but an IP based one and I really don't know how to make the openbsc.cfg for that one since I couldn't find anything in the wiki for it. I was trying to help Caleb and also understand the OM2000. I worked previously on RAN part with E/// and we integrated this RBSes with real BSCes and according to my notes E/// is not using full PCM timeslots (64kbit) exactly. They have 3 types of LDAP configurations for their Abis to RBS. - Unconcentrated LAPD For E1 they leave the full timeslot 0 free for synchronization and utilize timeslots 1-31. In this mode they use a full timeslot for signaling to TRU (TRXC) and 2 other full timeslots submultiplexed each in 4x 16kbit for voice and data. OML(CF) is not mentioned specifically but it says "TRXC-0 and CF goes together on the same timeslot". The E/// naming TRH (Transceiver Handler) says that is handling all LAPD signaling, signaling BTS to MS and O&M (CF). For T1 lines there is not synchronization timeslot used and sync is done from the overall T1 line so T1 config should start with "timeslot 0". - Concentrated LAPD Recommended for 3 or more TRUs. Here TS0 64kbit is for synchronization in E1 links, TS1 is used as 4x16kbit signaling for the first 4 TRXes, TS2-9 submultiplexed each in 4x16kbit for traffic, TS10 again 4x signaling,etc. For T1 the same but no TS0 so config starts with TS0 for 4x signaling links for the first 4 TRXes. Since in this mode you need also configuration for CON the CF(OML) is added by CON to the same timeslot as the first 4x TRXes that means TS1. - Multiplexed LAPD This is used for small cells and here I made the mistake in my previous mail saying is "Unconcentrated". This type of config multiplexes TRX signaling + CF(OML) + BCCH/CCCH + SDCCH8 in one full 64kbit timeslot and on the second timeslot keeps 2x 16kbit subrates spare. So in the end I am still not sure how the config should look like to have a PCM based RBS working with OpenBSC. > And don't forget to configure the BTS Abis allocation accordingly! > > Also for DAHDI, you will need to use the correct config with CCS signalling. > This is an example for the system.conf for an E1 based BTS: > > span=1,0,0,ccs,hdb3,crc4 > bchan=1-31 > Thanks for config. > Regards, > Csaba > Regards, Razvan
