
1.2 Maximum Cable Length
On any given C-Bus network, the total length of Cat-5 UTP cable used must not exceed 1 km.
This figure is determined by the propagation delay of C-Bus communication at a total cable
capacitance of 100nF.
Large cable lengths can introduce undesirable effects on the network such as:
• a drop in voltage
• an increase in cable capacitance.
A voltage drop will occur because the Cat-5 cable has a resistance of 90Ω per kilometre. To minimise
the amount of voltage drop along a large length of cable, evenly space the C-Bus power supplies
along the C-Bus Network.
Using a large amount of Cat-5 cable will result in a high capacitance, causing the C-Bus
clock to distort.
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