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IFC Networking—Metasys Intelligent Fire Network
Bus Configuration
A bus wiring configuration is defined as a twisted pair network where
more than one node shares the same circuit (refer to Figure 8).
Terminating resistors are only needed for the first and last nodes. All other
terminating resistors on the FN must be removed. For more details, refer to
the
Terminating Resistors
section later in this document. A fault anywhere
along the bus will affect the rest of the nodes/repeaters on the bus.
Note: Because of their inherent weakness, bus configurations are limited
to wiring between nodes/repeaters local to each other (such as
within the same cabinet or room). In a bus connection, data is
shared between all points on a twisted pair; therefore, the allowable
transmission distance between nodes without a repeater is
30.48 m (100 ft). For distance capabilities with repeaters, see
Table 7.
The circuit segment of each bus connection is a transmission line. The
physical connection of the twisted pair cable used for a segment
determines the impedance of the segment. To minimize unwanted data
reflections,
never
mix more than one brand name, gauge, or type of wire
wiring a bus segment.
Always
make bus connections at the MIB or
repeater terminals provided. Do not make branch connections at other
points.
A combination configuration can be used to distribute the network circuits
from a central facility, saving on wiring run lengths. Systems may be a
combination of point-to-point and bus wiring schemes (refer to Figure 11).
A repeater can be bus-wired to each of a central facility’s existing nodes
(located within the same room) to support point-to-point connections to
the remaining buildings in the system.
Combination
Configuration
Summary of Contents for FIRE-MON-17
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