Aastra 470, System Manual, Page: 119 / 250

Installation
119
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
Fig. 51 S bus, short, V-shaped
Fig. 52 S bus, long
Fig. 53 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. 60 Power balance on the S bus
Power available [W]
S bus short
S bus, long 5
1)
3.5
1)
1)
These values are based on a wire diameter of 0.5 mm.
X ¬
Ω
X
Ω
MAXM MAXM
MAX
M
$PNNVOJDB
UJPOTFSWFS
$POOFDUJPO
QPJOU
.BJO
EJTUSJCVUJPO
CPBSE
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