4-12
Chapter 4 Networking
Step 4. Wiring Network Cards (continued)
Wiring Guidelines A 655-158 Transient Suppressor (ordered as part of 748-599) is required for each
modem-to-telephone line connection.
Figure 4-9. The Transient Suppressor
Wiring Distances Maximum wiring distances are shown in Table 4-2.
Note:
• 18 AWG fire-rated twisted, shielded pair must not exceed 58 pF per foot and be less than or equal to
6.385 Ohms per 1,000 feet (305 m).
• 24 AWG twisted, unshielded telephone cable must not exceed 22 pF per foot and be less than or equal
to 25.6 Ohms per 1,000 feet (305 m).
Related
Documentation
Refer to the 900-242 Field Wiring Specifications for additional NIC wiring information.
8
5
Grn
Telephone Line
1
4
7
6
2
3
Transient Suppressor Assembly (655-158)
added to RJ-31x as shown. If connecting to a
terminal block, cut off one end of the cable.
Strip back the cable to connect the two center
wires, normally red and green, to the red and
green wires in the block.
Table 4-2. Wiring Distances
Media Type Size Data Rate Max Distance
Wired
24 AWG
57.6 kbps 7,000 ft (2,134 m)
9.6 kbps 12,000 ft (3,658 m)
18 AWG
57.6 kbps 10,000 ft (3,048 m)
9.6 kbps 17,000 ft (5,182 m)
Optical Fiber 50/125 um 57.6 or 9.6 kbps 10,000 ft (3,048 m)
62.5/125 um 57.6 or 9.6 kbps 15,000 ft (4,572 m)
Modem (Physical Bridge) 24 AWG (dry) 9.6 kbps 15,000 ft (4,572 m)
RS-232
18 AWG
57.6 kbps 50 ft (15 m)
9.6 kbps 300 ft (91 m)
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