Overall Limitations
NOTI•FIRE•NET™ PN 50257:E 7/5/01
7
Overall Limitations
When designing the wiring layout of a
NOTI•FIRE•NET™
system, the following distance
limitations must be considered:
1.
The length of each individual twisted pair or fiber optic network communication circuit
segment is limited. A segment is defined as either a point-to-point connection with two nodes/
repeaters, or a bus circuit encompassing multiple nodes. As illustrated in Figure 1, Example 1
segments 1, 2, and 3 are point-to-point circuits and Example 2 is a bus circuit encompassing
five nodes. The procedures differ to determine the maximum permissible segment length for a
twisted pair and a fiber-optic segment. The following paragraphs detail each procedure.
•
Twisted Pair Circuits
The length of cable for each segment in the system must fall within the range specified in Table
2. If the distance required for a circuit segment is greater than permitted, a Repeater module
(RPT-W) must be inserted into the circuit at intervals less than, or equal to, the length
restriction.
Cable type should be selected to satisfy the code requirements specific to a particular
application. Refer to Table 2 through Table 4 for descriptions of specific cable types used with
NOTI•FIRE•NET™
.
Figure 1 Circuit Wiring Layout
Note:
The use of
more than one type
of cable within any
point-to-point or
bus connection is
not permitted.
When utilizing
existing cable, be
sure to eliminate
any cable branches
or spurs.
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