Johnson Controls Metasys Intelligent Fire Network Technical Manual page 22

Table 7: Twisted Pair Wire Length vs. Node Count
Data
Wire Threshold
Setting
of all
Nodes/
Repeaters
(Rpts)
Belden High
1455A
Low
Belden High
1154A,
1155A,
1250A,
1229A, Low
1245A
High
Belden 9566
Low
High
Belden
9571, 9580
Low
Belden High
9574, 9572,
9581
Low
Belden High
9583, 9575
Low
Note: In noisy environments, use shielded cable and/or threshold setting high.
22 IFC Networking—Metasys Intelligent Fire Network
Permissible Distance in Feet for Each Cable Segment
Point
to
Point
2 3 4
Nodes/ Nodes/ Nodes/
Rpts Rpts Rpts
1-1,500 1-1,000 1-500
1,500- 1,000- 500-
3,500 3,000 2,500
1-1,000 1-500 1-400
1,000- 500- 400-
3,000 2,500 2,000
1-1,500 1-400 1-350
1,500- 400- 350-
3,000 2,500 2,000
1-100 1-400 1-350
1,000- 400- 350-
2,500 2,000 1,500
1-1,000 1-400 1-350
1,000- 400- 350-
2,000 1,500 1,250
1-300 1-250 1-200
300- 250-450 200-400
2,000
Bus Configuration
5 6 7
Nodes/ Nodes Nodes/
Rpts / Rpts Rpts
1-400 1-300 1-200
400- 300- 200-
2,000 1,500 1,000
1-300 1-250 1-200
300- 250- 200-800
1,700 1,300
1-300 1-250 1-150
300- 250- 150-500
1,500 1,000
1-300 1-250 1-200
300- 250- 200-500
1,000 750
1-300 1-200 1-150
300-900 200- 150-350
500
1-150 1-100 1-100
150-300 100- 100-150
200
8 9
Nodes Nodes
/ Rpts / Rpts
1-100 1-10
100- N/A
500
1-100 1-10
100- N/A
400
1-100 1-10
100- N/A
250
1-100 1-10
100- N/A
250
1-100 1-10
100- N/A
200
1-50 1-10
50-100 N/A