User's Manual

Commissioning
NTC DN999099 © Nokia Telecommunications Oy Internal Copy 23 (34)
Issue 1 en DRAFT 3 DraftConfidential
OMUSIG/TRXSIG1
The BTS can have one combined OMUSIG/TRXSIG1 which allocates 2, 4 or 8
bits in one timeslot depending on the link speed used (16 - 64 kbit/s). When a
compressed Abis timeslot allocation is used, the OMUSIG/TRXSIG1 can be
located in TCH/TS0 or TCH/TS0 - TS3 which means that it overlaps the TCHs
which are reserved for a TRX (normally TRX1).
TCHs
The BTS must be allocated at least as many TCHs as there are TRXs installed in
it (1 - 12). Each TCH allocates 2 contiguous time slots (16 bits) for a single TRX
each of which is marked with the TRX number. The TCHs are numbered from 1
to 12 in order of which they are defined.
TRXSIG
The BTS must be allocated at least as many TRXSIGs as there are TRXs installed
in it (1 - 12). Each TRXSIG can allocate 2, 4 or 8 bits in one time slot depending
on the link speed used (16 - 64 kbit/s). The TRXSIGs are numbered from 1 to 12
in the order they are entered.
TRXSIG on TCHs
The TRXSIG can be reserved on a traffic channel but then up to 4 traffic channels
are lost. The signal type must always start from the first bit of the channel.