Specifications
Table Of Contents
- Introduction
- Installation Procedures
- Commissioning Procedures
- Troubleshooting Procedures
- Overview
- Checking for Good Wire Runs
- Checking for Proper Termination
- Checking the End-of-Line Device Settings
- Checking for Proper Channel Selection
- Checking the N2 Device
- Checking the Number of Defined N2€Devices
- Checking the Length of N2€Bus
- Checking for “T” or “Y” Connections
- Checking for a Ground Loop
- Checking the Repeater
- Checking the Surge Protector
- Checking the Communication Terminal Board
- Checking Communication Faults
- Ordering Instructions
Network Communications—N2 Communications Bus
29
Figure 14 shows the star configuration, in which the first three repeaters
are installed in a central location and each device is wired from each
repeater.
NCU
(5000 ft)
(5000 ft) (5000 ft)
(5000 ft)
(5000 ft)
Repeater
Repeater Repeater
Repeater
Repeater
A: EOL In
NCM's
EOL In
B: EOL In
B: EOL In
EOL In
A: EOL Out
A: EOL Out
A: EOL Out
Central Location
1-slot NEU
Self
Termination
EOL In
1-slot NEU
EOL In
1-slot NEU
Self
Termination
A: EOL In
B: EOL In
B: EOL Out
(4997 ft)
(5000 ft)
B: EOL In
REPEATST
(3 ft)
N2 Bus
Maximum cable distance between
two repeaters is 1524 m ( 5000 ft). There is
no rule for minimum distance between repeaters.
Note:
ASC
(UNT Shown)
ASC
(UNT Shown)
1524 m
1523 m
1524 m
1524 m 1524 m
1524 m
1524 m
0.9 m
Figure 14: Repeater Star Configuration