Aastra NeXspan C, Руководство по установке

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AMT/PTD/PBX/0020/2/4/EN 01/2007 Page 145
For series wiring (Simplex or Duplex mode), 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.
• The maximum distance in meters between a Master PBX and the last slave in series wiring is:
D= (9760 - 50*N) / 5.5
N = number of PBXs in between
D = sum of the lengths of the synchronization cables used between the PBXs from the
secondary port of the "Master" up to the primary port of the first "Slave".
In the Simplex mode wiring example this gives:
D = (9760 - 50*3)/5.5 = 1747 => L1+L2+L3+L4 < 1745 m
• The sum of the lengths of the two intermediate sections must be less than 600 meters. If the
series wiring includes only one Slave, the length of the synchronization cable linking the
Slave to the Master must likewise be less than 600 meters.
In the Simplex mode wiring example this gives:
L1 + L2< 600 meters
L2 + L3< 600 meters
L3 + L4< 600 meters
• STP5 cable only must be used for the wiring.
Star wiring (Duplex mode)
Figure 7-10: Multi-site synchronization with UCT-L/UCT-S in Duplex mode (star wiring)
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. Each repeater stage
comprises two units, the first to distribute the bit clock and the second to distribute the multiframe
clock.
P S P S P S P S
P S
Esclave Esclave Esclave Esclave
Maître
Prioritaire
Maître
Non prioritaire
P S
REP 16 REP 16
Priority Master
Priority Master
Slave Slave Slave Slave