Section 3: Network Configurations; Point-To-Point Configuration; Nfpa Class B Configurations - Honeywell Notifier High-Speed NOTI-FIRE-NET Instruction Manual

Network system interface

Table of Contents

3.1 Point-to-Point Configuration

A point-to-point wiring configuration is defined as a segment with only two nodes/repeaters attached to it. In a point-to-point configura-

tion, two nodes/repeaters are interconnected by a single circuit that is terminated at each port (Refer to Figure 3.1 and Figure 3.3 for wir-

ing configurations).

Characteristic Impedance in a Point-to-Point Configuration

The wire segment of each point-to-point connection is a transmission line. The physical construction of the twisted-pair cable used for a

segment determines the characteristic impedance of that segment. To minimize unwanted data reflections, never mix more than one

brand name, gauge, or type of wire within a point-to-point segment.

NOTE: For 14 AWG (2.08 mm

maximum line DC Loop Resistance of 39 ohms is not exceeded.

3.2 NFPA Class B Configurations

High-Speed Noti•Fire•Net is capable of communicating using an NFPA Class B SLC (refer to Figure 3.1). Under this class of operation,

a single open, wire-to-wire short, wire-to-wire short and open, wire-to-wire short and ground, or open and ground results in fragmenta-

tion of the network. A single ground does not affect communication, but is detected. Each fragment of the network re-configures to per-

mit communication among the nodes within the fragment.