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Tom Tsou tom at tsou.ccHi Max, On Mon, Aug 1, 2016 at 7:57 AM, Max <msuraev at sysmocom.de> wrote: > I've asked about it before but this seems to have been lost in > communication. I do not recall this discussion. My apologies. > The question is basically how to enable multi-TRX support for > osmo-bts-trx using phy/instance infrastructure similar to other bts? I use the following configuration. phy 0 instance 0 instance 1 osmotrx rx-gain 25 bts 0 band 900 ipa unit-id 1234 0 oml remote-ip 127.0.0.1 settsc gsmtap-sapi ccch gsmtap-sapi pdtch trx 0 phy 0 instance 0 trx 1 phy 0 instance 1 $ osmo-bts-trx -c osmo-bts.cfg -t 2 > In short, I'd like to configure OpenBSC with 1 BTS with 2 TRX, each with > its own arfcn and set of channels. I'm running "osmo-bts-trx -t 2" and > correspondingly "osmo-trx -c 2" on usrp b210. Any ideas on what's > missing to make this actually work are greatly appreciated. You can use "osmo-trx -c 2" or "osmo-trx -m -c 2" to use dual-channels of the B210 or multi-ARFCN on one channel respectively. Note that there are ARFCN restrictions for both cases. Due to a shared local oscillator for both B210 channels, ARFCN separation can be up about 25 MHz. With multi-TRX, ARFCN spacing is fixed at 800 kHz or 4 GSM channels. So if TRX-0 is set to ARFCN 51, TRX-1 _must_ be set to 55. Up to three ARFCN's is supported for multi-TRX. -TT