Table 16: Guidelines for N2 network topology
Category Rules/maximums allowed
SNE2200x model supports two N2 Bus trunks.
SNE1100x and SNE1050x models support one N2 Bus trunk.
Note: The SNE110Lx
General
model does not support the N2 BusOnly daisy-chained N2 devices (with maximum
stub length of 3 m [10 ft] to any device)
Number of devices SNE2200x model: supports up to 100 N2 devices per N2 Bus, with no more than two
repeaters between network engine and any N2 device and a maximum of 50 devices
between repeaters.
SNE1100x model: supports up to 100 N2 devices per N2 Bus, with no more than two
repeaters between network engine and any N2 device and a maximum of 50 devices
between repeaters.
SNE1050x model: supports up to 50 N2 devices (maximum) on the N2 trunk with
no more than two repeaters between an SNE and any device and a maximum of 50
devices between repeaters.
1,500 m (5,000 ft) twisted pair cable without a repeater
4,500 m (15,000 ft) twisted pair cable from network engine and the farthest N2 device
(three segments of 1,500 m [5,000 ft] each, separated by repeaters)
Line length and type
2,000 m (6,600 ft) between two fiber modems
Cable type Solid or stranded 1.0 mm (18 AWG) 3-wire is recommended.
Solid or stranded 0.5 mm (24 AWG) larger 3-wire or 4-wire (two twisted-pairs) is
acceptable.
Note: The + and - bus leads should be a twisted pair. On applications using 4-
wire (two twisted-pairs) cable, isolate and insulate unused conductor.
Terminations Two N2 Bus devices with end-of-line (EOL) switches in the ON position, one at each
end of each N2 Bus segment
Table 17: Guidelines for LonWorks network bus topology
Cable type Maximum segment length with
FTT10 devices only
1
Maximum segment length with
FTT10 and/or LPT10/11 devices
Belden 85102 Cable 2,700 m (8,850 ft) 2,200 m (7,200 ft)
Belden 8471 Cable 2,700 m (8,850 ft) 2,200 m (7,200 ft)
Level IV 22 AWG 1,400 m (4,600 ft) 1,150 m (3,770 ft)
JY (St.) Y 2 x 2 x 0.8 900 m (2,950 ft) 750 m (2,460 ft)
1 For the bus topology, the maximum length stub cable is 3 m (10 ft), and the stub lengths must be calculated into the overall
segment length.
Table 18: Guidelines for LonWorks network free topology
Cable type Maximum node-to-node distance Maximum segment length with
FTT10 and/or LPT10/11 devices
Belden 85102 Cable 500 m (1,640 ft) 500 m (1,640 ft)
Belden 8471 Cable 500 m (1,640 ft) 500 m (1,640 ft)
Level IV 22 AWG 400 m (1,300 ft) 500 m (1,640 ft)
JY (St.) Y 2 x 2 x 0.8 320 m (1,050 ft) 500 m (1,640 ft)
SNE Installation Guide16
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