Ascotel IntelliGate 2025/2045/2065
Part 4 Cabling interfaces 773
The table below shows the power available in relation to the line length and the
line cross-section. The table can then be used to determine the number and type
of terminals that can be connected to the AD2 bus under the given conditions.
Tab. 4.35: Power available for terminals on the AD2 bus
Permissible range (max. 700 m) for 2 terminals on the AD2-Bus if one or both terminals are of the
type Office 20, Office 30 or Office 40. For the system terminals Office 10, Office 25,
Office 35 and Office 45 this restriction does not apply.
With the SB-8 radio unit only half the output is to be used, provided it is con-
nected to two AD2 interfaces.
Automatic detection of critical power supply situations
When an Office terminal (or a second such terminal) is connected to the AD2 bus,
the maximum power input is automatically determined; all the terminals (incl.
EKP, AKB) connected to the interface are taken into account. The maximum
power available is also determined based on the calculated line length (assump-
tion: wire ø = 0.5 mm). If the calculated power available is below the maximum
possible power input of the connected terminals, the message "Power supply crit-
ical xy m" is generated on the terminal connected last (accuracy approx. 150 m).
Rating examples
Example 1
Office 45 with 1 expansion keypad and alpha keyboard
Maximal power requirements as per Tab. 4.34: 1290 mW
Tab. 4.35 indicates:
• Maximum line length for a wire diameter of 0.4 mm: 782 m
• Maximum line length for a wire diameter of 0,6 mm: 1200 m
Loop resistance R 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
Power available
P
max
. (mW)
2620 2492 2364 2236 2108 1980 1852 1724 1596 1459 1343 1245 1160 1086 1021
Length (m) with:
0.4 mm wire ø 71 142 213 284 356 427 498 569 640 711 782 853 924 996 1000
0.5 mm wire ø 111 222 333 444 556 667 778 889 1000 1111 1200 1200 1200 1200 1200
0.6 mm wire ø 160 320 480 640 800 960 1120 1200 1200 1200 1200 1200 1200 1200 1200
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