Installation
139
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014
Fig. 51
S bus, short, V-shaped
Fig. 52
S bus, long
Fig. 53
S bus, point-to-point
Greater distances (up to 8km) 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. 64
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
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
