Product manual

System description, Radio exchange boards

Technical Product Manual - DCT1800-GAP

TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C

Fig. 5 Speech Processing Unit-S (SPU-S)

4.4 Cell Link Unit – CLU

The cell link unit provides the communication interface between the SPU-S or SPU part of the SLU

and the base station. Every CLU board contains 8 Cell Link Circuits (CLC, see figure

6). Each CLC

communicates with one base station.

The main functions of the board are:

• Switch 8 speech channels simultaneously from the radio exchange to the base station via 2

twisted-pairs

• Provide synchronization and powering for the base station

The base station control, TDMA frame generation and radio link maintenance functions are

implemented in the base station.

For ‘short’ distances between the base station and the radio exchange (up to 1.9 km) the Speech Link

Unit (SLU) or CLU-S can also be used. For longer distances (up to 3.5 km - only applicable for KRCNB

201 base stations and 301, 302 and 303 base stations of revision R1n or R2n) a CLU must always

be used.

Fig. 6 Cell Link Unit (CLU)

Peripheral

LTC

SPC

LTC

SPC

LTC

SPC

033

CLC

Peripheral

Base

station

034