Wiring rules and guidelines for network integrations
Table 2: MS/TP Bus rules
Category Rules/maximums allowed
One MS/TP Bus trunk supported per NAE (on NAE351x-x and NAE451x-x
models only)
General
Only daisy-chained MS/TP devices
MS-NAE451x-x models support up to 100
1
MS/TP devices total on the FC Bus
with no more than two repeaters between an NAE45 and any device and a
maximum of 50 devices between repeaters.
Number of
FC Devices
Supported
MS-NAE351x-x models support up to 50
1
MS/TP devices total on the FC Bus
with no more than two repeaters between the NAE35 and any device and a
maximum of 50 devices between repeaters.
1,500 m (5,000 ft) cable per bus segment without a repeater
4,500 m (15,000 ft) cable from NAE to the farthest FC Bus device (three bus
segments of 1,500 m [5,000 ft] each, separated by repeaters)
Bus Length
2,000 m (6,600 ft) between two fiber modems
Cable Type
2
Stranded 0.6 mm (22 AWG) 3-wire twisted, shielded cable is recommended.
Stranded 0.6 mm (22 AWG) 4-wire (two twisted-pairs) shielded cable is
acceptable.
Note: The + and - bus leads should be a twisted pair. On FC Bus
applications using 4-wire (two twisted-pairs) cable, isolate and insulate
unused conductor. Refer to the MS/TP Communications Bus Technical
Bulletin (LIT-12011034) for more information.
Terminations Two FC Bus devices with EOL switches in the ON position, one at each end of
each FC Bus segment
1 If the TEC Thermostat Controllers or third-party MS/TP devices are connected to the FC Bus, the maximum total number
of MS/TP controllers on an FC Bus is 64 for NAE45 models and 32 for the NAE35 models. The maximum cable length per
bus segment is 1,219 m (4,000 ft) and the maximum total FC Bus length is 3,658 m (12,000 ft).
2 Refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034) for more information on alternative cable types
and lengths.
Table 3: N2 Bus rules
Category Rules/maximums allowed
MS-NAE351x-x and MS-NAE451x-x models (only) support one N2 Bus trunk.General
Only daisy-chained N2 devices (with maximum stub length of 3 m [10 ft] to
any device)
MS-NAE451x-x models support up to 100 N2 devices (maximum) on the N2
trunk with no more than two repeaters between an NAE45 and any device and
a maximum of 50 devices between repeaters.
Number of
N2 Devices
Supported
MS-NAE351x-x models support up to 50 N2 devices (maximum) on the N2
trunk with no more than two repeaters between an NAE35 and any device and
a maximum of 50 devices between repeaters.
15NAE35/NAE45 Installation Guide
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