MS Block Diagram

TRX Block Diagram

BTS s in Standard Configuration

BTS s in Umbrella Configuration

BTS s in Sectored Configuration

Block Diagram of BSC

Possible positions for TRAU and associated trade-off

The NSS schematic

Abis Interface Channel Configuration – An Example

Serial Connection of BTS s to BSC in a line topology

Serial Connection of BTS s to BSC in a ring topology

Connection of BTS s to BSC in a start configuration

The OSI protocol stack on the Abis interface

LAPD frames

The format of an LAPD frame modulo 128

The format of an LAPD frame modulo 8

TEI & C/R

Possible values of C/R bit

Frame Types of the Abis Interface