Dect Clock Interfaces - Matra Nortel MC 6500 Manual

5.6.5

DECT CLOCK INTERFACES

The LDS card manages the DECT synchronization by sending a 800 ms time signal to the
S0 interface in DECT radio base stations (M bit S-interface multiple frame mechanism).
The LDS card provides two operating modes that can be configured using switch CA1:
♦
master mode
♦
slave mode
Master mode
Using the clock signals from the synchronous bus, the LDS card generates a clock signal
complying with that defined for DECT synchronization.
Using this clock signal, the LDS card sends a DECT time signal (M-bit) to the S interfaces
and physically supplies three clocks as V11 differential pairs:
♦
Two outgoing clock signals (SYNA and SYNB)
♦
Depending on the LDS card mode (master or slave), a third pair will be used as
SYN incoming or outgoing.
Each V11 pair can supply four receivers (slave LDS cards or slave base stations).
Slave mode
In this mode, the LDS card uses the clock signal received from the SYNC pair and
regenerates it on the S interfaces (in the form of synchronized clocks) and on the two
outgoing clock signals SYNA and SYNB.
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