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Harald Welte laforge at gnumonks.orgOn Wed, Apr 13, 2011 at 01:10:54PM +0200, Konrad Meier wrote: > Hi all, > > I was just reading the wiki page about the nanoBTS multi-TRX setup. > Two things are not clear to me. > > 1. What is the purpose of the "RF cable"? that is unclear, we don't have documentation on it.. The TIB (timing interface bus) cable is obvious: to synchronize timing. The OML gets routed via the ethernet ports. So I don't really know why they need an extra RF cable... > Is the TX port of the master BTS looped through the second BTS? Or > hase every nanoBTS his own TRX/RX? NO !!! my god, you don't want to kill your BTSs. Tx / Rx is separate like before. > I am asking because I would like to use a nanoBTS-Booster with the > multi-TRX setup and therefore require a combined RF signal. the best idea is to use independent boosters. If you want to run two TRX nanoBTS throguh one amplifier, you need high-grade RF combiner, make sure the amplifier doesn't produce intermodulation, etc. Definitely not something you want to be doing without somebody who has a clue about proper RF setups at those frequencies. > 2. The example example "openbsc.cfg" configures the trx 1 as follows: > > timeslot 0 > phys_chan_config CCCH+SDCCH4 > timeslot 1 > phys_chan_config SDCCH8 > > Is this really needed? My first idea was to configure the second trx > to TCH/F only. That depends on your network requirements, you can of course have all TCH/F. -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)