
C-Bus™ Basic Programming 1250SM0904R10/09
C-Bus™ Products Training Course 10/2009
24 © 2009 Schneider Electric. All Rights Reserved.
C-Bus Network Specifications
There are a number of different factors that affect C-Bus networks. The
following chapter will address the various network specifications of a C-Bus
network. These specifications need to be met to ensure reliable C-Bus
operation.
C-Bus Cable
There are a number of different factors to adhere to when using Cat-5 cable
in a C-Bus installation. This section of the manual will identify them.
Cable Type
The C-Bus data cable is a colour coded 4 pair Category 5 UTP data cable.
The cable has an outer sheath that is a different colour, which makes it easy
to distinguish from other voice and data cables in the installation. The inner
cable consists of four unshielded twisted pairs (UTP) providing:
A high data rate capability
Immunity to induced noise from external sources
Superior crosstalk performance
A known impedance.
The C-Bus Data Cable is recommended for use in all C-Bus installations,
especially projects where large cable runs are used on single C-Bus
networks.
C-Bus Cable
Figure 15 - C-Bus data cable
NOTE: When any C-Bus cable needs to be run underground, it is strongly
recommended to use a gel filled Category 5 UTP cable inside of suitable
conduit. Consult your local wiring standards for more details.
C-Bus Cable Pairs
C-Bus uses the following Category 5 cable pairs:
Data Pair Function for C-Bus
Orange + Blue C-Bus Positive voltage
Orange/White + Blue/White C-Bus Negative voltage
Green + Green/White Remote Override On
Brown + Brown/White Remote Override Off
Table 12 - C-Bus Category 5 UTP cable pairs
Two conductors are used for each positive and negative C-Bus voltage
connection. This allows:
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