Trans-Coder Functionality (TRC) Basic

Ahmed Saif Al-Suleimani Ericsson Oman Front Office Engineer

BTS BSC

E1=32Ts. (E1=RBLT=DIP)

MSC/MSC-S

E1=32Ts. (E1=RALT=DIP)

MS

Ts=16kb

TRC

Each Ts in E1 between BTS and BSC are 64kb but it use only 16kb.

Each Ts in E1 between BSC and MSC 64kb and fully used

Transmission between GSM network nodes

16kb 16kb 16kb

16kb16kb

Ts=Ts=

Trans-coder (TRC) Functionality

BTS BSC

E1=32Ts each 16kbE1=32Ts each 64kb

MSC/MSC-S

TRC

TRC

Ts =16kb4Ts

each With 16kb

TS=64kb Ts from many

BTSs

1- TRC will multiplex 4Ts from BTSs to 1Ts and de-multiplex 1Ts(64Kb) to 4Ts(16Kb each) . Because MSC device are works with 64kb.2- 16 BSCs can connect to ONE TRC.

1Ts (64Kb)

MS : Mobile Station BTS : Base Transceiver StationBSC : Base Station Controller MSC :Mobile Switching CenterMSS-S: Mobile Soft Switch Server TRC: Trans-coder TS: Time SlotE1: Physical link between Nodes (E1=2mb)

Abbreviations