Page 112
01/2007
AMT/PTD/PBX/0020/2/4/EN
5.4
synchronization
The DECT radio base station synchronization method varies with the device used (FPHBG2/CSI
or FPHBG/CSH) and the boards installed (LDS and/or LDT). The back plane assembly FPHBG2/
CSI and FPT30B/FPD30B allows the DECT clock to be sent on the loop and simplifies the DECT
synchronization wiring in a single-site configuration.
5.4.1 For a NeXspan 50 equipped with an FPHBG2 back plane as well
as CSI and LDT boards
The CSI board generates a DECT clock and sends this clock to all the PBX clusters. The
synchronization signal is sent via the loop and extracted by the RMH boards. The DECT
synchronization signal is then sent to the LDT boards via the back plane.
Hardware specifications
•
The PBX is equipped with a CSI card and an FPHBG2 back plane.
•
Only the LDT cards are used to connect base stations.
•
Clusters with LDT cards are equipped with FPD30B or FPT30B back planes.
•
These same clusters are fitted with RMH cards, ref.: HJ3773BD03 (minimum index for
transmitting the DECT clock on the loop) for sending the DECT clock.
•
The plugs used with the LDT cards are AVLDT plugs (ref HR5124C).
Configuration
•
The DECT base stations must be configured in synchronization mode by the M bit.
•
All the LDT cards must be configured as "Slaves" ("Master"/"Slave" mode can be configured
via jumper CA1.1).
•
For co-located clusters: there is no transmission delay on the loop. The setting is the same on
all the RMH cards, V=1. Therefore, the switches must be configured as follows (factory
configuration):
CA3-3 and CA3-4 = OFF
CA2 + CA1+ CA3-1,2 = ON
Binary value: ON = 0 ; OFF = 1
Figure 5-15: Default configuration (factory configuration) of switches CA1, CA2, CA3
on the RMH card (V= 1)
CA2
ON
1 2
4
3
CA1
ON
CA3
ON
1 2
4
3
RET10
RET0
NMULTI not used
(always OFF)
1 2
4
3
Summary of Contents for NeXspan C
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Page 70: ...Page 70 01 2007 AMT PTD PBX 0020 2 4 EN Figure 4 2 Bottom view of the LD4 ST card...
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