AMT/PTD/PBX/0020/2/4/EN
01/2007
Page 135
Chapter 7 - Multi-site synchronization
7.1
Principles of installation
7.1.1
Contiguous multi-site configuration
In a contiguous multi-site configuration, the base stations of site 1 can "hand over" to base
stations of site 2. The base stations of the different sites must therefore be synchronized with a
single 800 ms clock.
If the configuration allows it, it is preferable to synchronize the remote site(s) via the inter-site
link(s) and NOT via the external accesses (France Telecom) to obtain 2.048 MHz bit
synchronization.
F4 multi-site configurations with a link (T2 or QSIG)
•
For a device equipped with an FPHBG back plane and CSH, LDS and/or LDT cards: with two
inter-site links, when the USB is duplicated, the clock of the first link synchronizes the first
card of the USB (CSH, CUH or CUS card) of the slave PBX, and the clock of the second inter-
site link synchronizes the second card of the USB of the slave PBX.
If the USB is not duplicated (single CSH, CSI, CUH or CUS card), the clock of the second
inter-site link must be connected to the same CSH, CSI, CUH or CUS card as the clock of the
first link.
•
For a device equipped with an FPHBG2 back plane and CSI, LDT card: the BCSI board,
connected to the RHMIC board, synchronizes the USB boards in NeXspan 50s to provide a
DECT synchronous multisite network offering DECT mobiles the inter-site handover function.
The BCSI board sends or receives the DECT synchronization and the 2.048 MHz bit
synchronization to/from another PBX; it determines the compensation to make on the DECT
clock received according to the distance of the transmitting PBX and retransmits the clocks
received to the CSI card.
7.1.2
Non-contiguous multi-site configuration
In a non-contiguous multi-site configuration there is no overlap between the radio coverage of
the different sites. It is not therefore necessary to synchronize the base stations of the different
sites, nor the sites themselves.
Note:
Before setting up a DECT multi-site network, particularly if the network uses multiplexers
or modems in the inter-site links, contact the manufacturer's pre-sale services.
Summary of Contents for NeXspan C
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