Aastra NeXspan C, Installation Manual

Page: 148 / 196

Page 148 01/2007 AMT/PTD/PBX/0020/2/4/EN
7.5 synchronization on NeXspan 50 with CSI
7.5.1 Principle
In a configuration comprising several (contiguous) PBXs fitted with a CSI card, you do not need
to wire the DECT base stations with a third pair for synchronization. Multi-site DECT
synchronization on NeXspan 50 requires the RHMIC and BCSI boards to be installed. The
RHMIC board is connected to the rear of the back plane of shelf FPHBG2 on the HMIC
connector. It is fitted with two 96-pin connectors for connecting the BCSI card and the
synchronization cable. 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.
The BCSI board has two synchronization ports (RJ45 connectors): a DECT S secondary port (in
output) and a DECT P primary port (in input), compatible with those of M6501L/R IP and
NeXspan S/L/D PBXs.
"Master" and "Slave" mode:
The synchronization ports work in the following modes:
• "Master"mode: the signals from the secondary port transmit the 2.048 MHz bit clock and
reference DECT synchronization from the "master clock" CSI board to a PBX in slave mode.
• "Slave" mode: the 2.048 MHz bit clock and DECT synchronization are received from a
synchronization port of the PBX in master mode and synchronize the CSI boards connected
to the BCSI.
DECT P
DECT S
Back plane
connection
HMIC slot
RHMIC
BCSI terminator
96-pin
connector
for connecting
the synchronization
cable