Aastra Ascotel IntelliGate 2025 - Page 780

Ascotel IntelliGate 2025/2045/2065
780 Cabling interfaces Part 4
Fig. 4.58: S bus, long
Fig. 4.59: S bus, point-to-point
Greater distances (up to 8 km) can be achieved using the S bus extension PT 10
(see "S Bus Extension PT 10", page 138).
Restrictions
The maximum number of terminals per S bus is further restricted by the power
requirements of the terminals and their supplementary equipment:
Tab. 4.41: 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.
Installation rules
• Always terminate the bus extremity with 2 x 100 Ω (0.25 W, 5%)!
• If the subscriber cabling is integrated into the installation of a universal building
cable installation (UBC), cross-over the S bus see "Connection to a universal
building cable installation (UBC)", page 747).
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.
2 x 100 Ω
PBX
max. 500 m
max. 20 m
1st 2nd
4
th
connection
point
haz0030aaena0
2 x 100 Ω
PBX
max. 1000 m
Connection
point
haz0031aaena0