Aastra NeXspan C, Installation Manual

Page: 146 / 196

Page 146 01/2007 AMT/PTD/PBX/0020/2/4/EN
For star wiring the following rules must be respected:
• There are no particular postioning rules to be followed for the slaves behind the two "Master"
PBXs. In Simplex mode in particular, all the slaves are wired in series behind a single Master
PBX.
• In Duplex mode, the two "Master" PBXs must be no more than 10 meters apart.
• STP5 cable only must be used for the wiring.
• The repeaters can be organised in cascade.
• The maximum distance between the secondary port of a PBX and the repeater module is 600
meters.
• The maximum distance between a repeater module and the primary port of a PBX is 600
meters.
• The maximum distance in meters between a Master PBX and a Slave PBX is:
D = (9760 - 50*N) / 5.5
N = number of repeaters crossed
D = sum of the lengths of the synchronization cables used between the secondary port of the
Master and the primary port of the slave.
Mixed wiring (Duplex mode)
Figure 7-11: Multi-site synchronization with UCT-L/UCT-S in Duplex mode (mixed wiring)
Series wiring and star wiring are combined.
The two "Master" PBXs are connected via their primary port. Their Slave port powers a REP16
module to which a maximum of 16 slave PBXs can be connected.
The rules to be respected are those given for series wiring and star wiring in the corresponding
sections.
The maximum distance in meters between a Master PBX and the last Slave PBX in a chain is:
D = (9760 - 50*N) / 5.5
N = number of slave PBXs and/or repeaters crossed
D = sum of the lengths of the synchronization cables used between the secondary port of the
Master and the primary port of the slave.
Esclave
P S P S P S
P S
P S
Esclave
Esclave
Esclave
Maître
Prioritaire
Maître
Non prioritaire
P S
REP 16 REP 16
REP 16
P S
Esclave
Priority Master
Priority Master
Slave
Slave
Slave
Slave
Slave