Installation
122
Aastra 415/430 as of R3.2
syd-0344/1.6 – R3.2 – 09.2014
Connection
Tab. 54 Connection of BRI-S terminal interfaces
S bus configuration
The S bus is a four-wire, serial ISDN bus based on the DSS1 protocol (ETSI standard).
It starts in each case at an BRI-S interface of the communication server. Four bus
configurations are possible, depending on the line length and the number of ter-
minals:
Tab. 55 S bus configurations depending on line length and the number of terminals.
Note
The maximum number of terminals per S bus depends on the power
requirements of the terminals (see "Restrictions", page 123).
Fig. 46 S bus, short
Communication server Cable cores Connection socket
Socket Pin
BRI-S sig-
nal
BRI-S sig-
nal
Pin Socket
1– –1
2– –2
3c c3
4f f4
5e e5
6d d6
7– –7
8– –8
S bus Short Short, V-shaped Long Point-to-point
Length (max.)
Server terminal
Terminal 1 Terminal 4
150 m
–
2 150 m
–
500 m
20 m
1’000 m
–
Number of terminals (max.) 8 8 4 1
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