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7.6.4
F4/F4, F4/F6 or F4/F1 contiguous multi-site configuration
Case of multisite F4/F4 device with an F4 equipped with an FPHBG back
plane and CSH, LDS and/or LDT cards
The slave PBX must be synchronized via an inter-site link (2.048 MHz clock).
The base stations must be wired in two pairs. The synchronization signal is carried by the M bit in
the S frame.
One LDS or LDT card must be declared master and the other LDS/LDT cards slave. The master
card 800 ms clock (SYN outgoing differential signal) must be connected to the slave card (via the
distribution frame - terminal strip 4G).
master card
(1)
: even in an IP multi-site network, as the IP network is not synchronising, the PBXs must be
connected by a synchronising inter-site link.
Figure 7-20: Contiguous multisite F4/F4 (with F4 fitted with FPHBG/CSH/LDS/LDT card)
AMT/PTD/PBX/0020/2/4/EN
DECT base stations
master PBX
L
D
S
S0 bus
/
F4
L
D
T
synchronising inter-site link
2.048 MHz clock
IP network
01/2007
slave PBX
F4
800 ms clock
(1)
DECT base stations
L
D
S
/
L
S0 bus
D
T
slave cards
Page 155
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