Aastra X Series, Installation And Implementation Manual

Page: 135 / 217

Page 7-135 10/2008 AMT/PTD/TR/0020/2/7/EN
7.2.8 DECT clock interfaces
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. The configuration rules
are as follows:
• The DECT base stations must be configured in synchronization mode by the M bit.
• The LDT boards must all be configured in "Slave" mode.
• For co-located clusters: there is no transmission delay on the loop. The adjustment is
exactly the same on all the RMH boards (Value V=1). Therefore, the switches must be
configured as follows (factory setting):
CA3-3 and CA3-4 = OFF
CA2 + CA1 + CA3-1,2 = ON
Note Binary value: ON = 0; OFF = 1
• For remote clusters: the transmission time compensation on the loop must be configured
in the RMH board(s) of all the clusters that contain LDT boards to which DECT base
stations are connected. This configuration is set through the switches on the RMH
board.
The 800 ms will be transmitted to the LDT card according to the position of the TOPRAD jumper
for each LDT position concerned.
.
Figure 6-3: FPS rear panel jumpers
*Make sure you respect the screen printing; there is no foolproofing.
7.2.9 Connecting the LDT card
The LDT card is inserted in a CLX slot in the base and/or expansion shelves depending on the
configuration file.
The LDT card is connected to the distributor by a special cable also used for the remote power
supply connection.
The remote power supply connection requires a cable (the specific cable) used to retrieve the
subscriber’s 40 V ISDN or 48 V on the back plane (J4).
The ISDN clock is connected to the RSU with a 21-pin connector (J3).
Nom Position Utilisation
TOPRAD J13 Horloge DECT CLX7 présent => Cavalier sur ON *
TOPRAD J16 Horloge DECT CLX2 présent => Cavalier sur ON *
TOPRAD J19 Horloge DECT CLX1 présent => Cavalier sur ON *
TOPRAD J22 Horloge DECT CLX0 présent => Cavalier sur ON *