Aastra 470 - Page 143

Installation
143
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
Fig. 50 S bus, short, V-shaped
Fig. 51 S bus, long
Fig. 52 S bus, point-to-point
Greater distances (up to 8 km) can be achieved using a standard commercial S bus
extension.
Restrictions
The maximum number of terminals per S bus is further restricted by the power re-
quirements of the terminals and their supplementary equipment:
Tab. 62 Power balance on the S bus
The number of terminals is the sum of the power requirements of the individual
terminals and the power available on the S bus.
Power available [W]
S bus short 5
1)
1)
These values are based on a wire diameter of 0.5 mm.
S bus, long 3.5
1)
2.1. 3.
2 x 100 Ω
2 x 100 Ω
max. 3 m
max. 150 m
max. 150 m
8. Connec-
tion point
(Main)
distribution
frame
Communication
server
1.
2.
2 x 100 Ω
4. Connection
point
Communica-
tion server
max. 500 m
max. 20 m
max. 1000 m
2 x 100 Ω
Communi-
cation
server
Connection
point