Aastra Ascotel IntelliGate 2065 - 7.4.2.3 S bus configuration

Ascotel IntelliGate 2025/2045/2065
Part 4 Cabling interfaces 779
7.4.2.3 S bus configuration
The S bus is a four-wire, serial ISDN bus based on the DSS1 protocol (ETSI stand-
ard). It starts in each case at an S interface of the PBX. Four bus configurations are
possible, depending on the line length and the number of terminals:
Tab. 4.40: 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 772).
Fig. 4.56: S bus, short
Fig. 4.57: S bus, short, V-shaped
S bus Short Short, V-shaped Long Point-to-point
Length (max.)
PBX ↔ Terminal
Terminal 1 ↔ Terminal 4
150 m
—
2 x 150 m
—
500 m
20 m
1’000 m
—
Number of terminals (max.) 8 8 4 1
2 x 100 Ω
PBX
max. 150 m
1st 2nd 3rd
8
th
connection
point
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2 x 100 Ω2 x 100 Ω
PBX
Main distribution board
max. 150 m max. 150 m
2.1. 3.
8
th
connection
point
max. 3 m
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