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Max msuraev at sysmocom.deThanks for explanation. In case of B210 I've got following error: <000b> trx_if.c:380 transceiver (phy0.1) rejected TRX command with response: 'RSP SETTSC 1 7' What could be causing it? Is there some special setting(s) required for 2nd TRX? On 06/16/2016 07:10 PM, Tom Tsou wrote: > On Thu, Jun 16, 2016 at 8:21 AM, Pierre Baudry > <pierre.baudry at diateam.net> wrote: >> On 16/06/2016 17:00, Max wrote: >>> I've noticed check for device type around >>> Transceiver52M/UHDDevice.cpp:772 - seems like USRP B200 is not supported >>> for multitrx configurations: >>> sudo chrt 20 ./Transceiver52M/osmo-trx -c 2 >>> sudo chrt 15 ./src/osmo-bts-trx/osmo-bts-trx -c >>> ~/.config/osmocom/osmo-bts-trx.cfg -i 192.168.122.1 -t 2 >>> >>> Where does this limitation comes from? Is it just smth which is not >>> implemented (yet) or it's impossible to implement due to X and Y? > B200 is a single RF channel device. > >> However, you could try Thomas's work on multi-arfcn transceiver which >> can be found here: https://github.com/ttsou/osmo-trx/tree/mcbts > Now that GPRS is working with osmo-bts-trx and osmo-trx, I will begin > merging the multi-carrier transceiver chain in the coming week. > > The history is that multi-arfcn was initially developed on the single > channel USRP2. In later devices, such as the UmTRX and B210, there > were advantages in both simplicity and RF performance from separate > discrete channels, and that became the preferred multi-channel > approach used for later testing. > > There are still, however, benefits (i.e. cost and higher capacity > support) to the multi-carrier approach on a single physical RF channel > that make it worthwhile to support in mainline. > > -TT -- Max Suraev <msuraev at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte