TRX and E1

Hi,

About TRX/E1 I cut &paste from a previous Pix’s message:
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with standard OML/RSL multiplexing :
1 E1 has 32 timeslots, with:
1 TS for physical signalling/synchro
1 TS per group of 4 RSL (=4TRX)
2 TS per TRX

a BTS with 4 TRXs use 10 E1 TS (1×4)
a BTS with 5 TRXs use 13 E1 TS
a BTS with 6 TRXs use 15 E1 TS
a BTS with 7 TRXs use 17 E1 TS
a BTS with 8 TRXs use 19 E1 TS (2×4)
a BTS with 9 TRXs use 22 E1 TS
a BTS with 10 TRXs use 24 E1 TS
a BTS with 11 TRXs use 26 E1 TS
a BTS with 12 TRXs use 28 E1 TS (3×4)
a BTS with 13 TRXs use 31 E1 TS
a BTS with 14 TRXs use 32 E1 TS (4/4/6)

In Alcatel, with a more agressive multiplexing, one can reach more TRXs per E1
(but less radio timeslots for TCH can be defined) (up to 16 TRX / E1).
But this is not recommended, because nobody wants to loose TCH capacity 🙂
It can be useful for remote BTS with Abis over satellite.
—————————————-

The previous TRXs are grouped in several Cells. Then only a single TRX per Cell will have a BCCH channel.
Other timeslots are coonfigured for signalling or traffic (TCH) in a variable ratio.

For Siemens equipment we have:

1 TS Synch
1 TS(16 or 64 Kbps) for signaling LPDLM
30 TS shared between TCH and GPRS
Without GPRS and more SDCCH TS we can reach 16 or 17 TRXs

Hi Assia

The assumption of 1 TRX with 4 voices of 16kbits/s is incorrect 1 TRX is 8 channels of 16kbits/sec so 1 TRX takes 2.25 TS of the E1, so 12 trx = 27 TS + 1 ts for omu + 3 ts for rsl (i.e for 3 cells + the first ts of e1 is not usable for tch) so practically 1 e1=12 trx

One E1 is how many trx
and one TRX is how many E1
and one TRX can support how many people in second

Hi,

4 RSL are usually carried by one TS.
In case of high loaded RSL, you can configure 2 RSL per TS.