User`s guide

LONWORKS FTT-10A Transceiver User’s Guide 4-5
Transmission Specifications
Table 4.2 Doubly-Terminated Bus Topology Specifications
Maximum bus length Units
Belden 85102 2700 meters
Belden 8471 2700
Level IV, 22AWG 1400
JY (St) Y 2x2x0.8 900
TIA Category 5 900
A doubly-terminated bus may have stubs of up to 3 meters from the bus to each
node.
Table 4.3 Free Topology Specifications
Maximum
node-to-node
distance
Maximum total
wire length
Units
Belden 85102 500 500 meters
Belden 8471 400 500
Level IV, 22AWG 400 500
JY (St) Y 2x2x0.8 320 500
TIA Category 5 250 450
The free topology transmission specification includes two components which
must both be met for proper system operation. The distance from each transceiver
to all other transceivers and to the termination (including the LPI-10
termination, if used) must not exceed the maximum node-to-node distance. If
multiple paths exist, e.g., a loop topology, then the longest path should be used for
the calculations. The maximum total wire length is the total amount of wire
connected per segment.