Cellular Network Infrastructure » Radio Access Network » OsmoBSC

== Hardware interface ==

We are using a 120 Ohms balanced connection between the BS11 and a HFC-E1 card.

To configure the BS11 hardware correctly, you need to

 * open the connection between pin 2 and 3 of the 4 jumpers below connector J01

=== Cable to RJ45 ===

 * left Y01 PCM in (from BSC): RJ45 pin 4,5

 * Y02 PCM out (to BSC): RJ45 pin 1,2

 * Y03 PCM connected 1:1 with Y04 PCM

== Configuration of BTSM Object ==

 * BS11 requires PCM30CRC4  64kBit/s no Subslots

 * OM Layer on Timeslot 1

 * TEI for OM Layer default Siemens is 25 (but configurable in BS11 [wiki:LMT])

 * the following parameters are not configurable

  * RSL Layer on Timeslot 1, too

  * TEI for RSL is fixed in  Siemens equipment

  * TEI = 0 für TRX0

  * TEI = 1 für TRX1

  * Attention: if you select OM Layer TEI 0 oder 1, RSL can no longer be brought up

 * Timeslots for TCHs

  * TRX0: TS2 und TS3

  * TRX1: TS4 und TS5

== E1 interface ==

LI Objekt:  Line  MULTIDROP

Impedance 120 Ohm balanced to connect to HFC-E1 board

Additionally you will need to change some jumpers on the connector board

of BS11 (FIXME: which ones?)

== Database ==

Important database settings:

 * the database has to be downloaded from PC via E1 to BS11

 * BCCH channel combination Type  5  oder 8 (including SDCCH for SMS)

 * TCH combination 0 oder 9

{{{

Cell config:    Not hopping

                No Concentric Cell = 0

                Radiomeasgran =254

                No Power Reduction = 0

                Excessive distance =0 disabled

}}}