Echelon FT 3150 Smart Transceiver - Manual (Page 118)

Chapter 5 - Network Cabling and Connections
112 FT 3120 / FT 3150 Smart Transceiver Data Book
Echelon has qualified a variety of cables for use with TP/FT-10 channels. Based on the cost, performance, and
availability of these different cable types, system designers can choose the most appropriate cable for their
application. Echelon has qualified five “generic” cable types, as follows:
• A generic 16AWG (1.3mm diameter) cable (similar to Belden 85102);
• NEMA Level 4 cable (this cable is not equivalent to TIA Category IV cable); and
• TIA Category 5 cable.
The electrical specifications for these cables can be found in Appendix B. A list of cable vendors can be found in the
Junction Box and Wiring Guidelines for Twisted Pair L
ON W ORKS Networks engineering bulletin (005-0023-01). This
bulletin can be found on the Echelon website (www.echelon.com). These cables have been qualified by Echelon
in a generic form, and are available from vendors in a number of variations, including shielded, unshielded, plenum,
and non-plenum jacketing. Additionally, Echelon has qualified two 16AWG (1.3mm) Belden cables, and one cable
used in specific applications in the European market (JY(St)Y).
Note: The following specifications are for one network segment. Multiple segments may be combined using FTT-
10A based physical layer repeaters or LonPoint routers to increase the number of devices and distance as described in
the FTT-10A Free Topology Transceiver User’s Guide.
System Specifications
• Up to 64 FT-X1 or FT-X2 Transformers and FT Smart Transceivers are allowed per network segment.
• LPT-10 transceivers may be used on network segments with FTT-10A transceivers and FT Smart Transceiv-
ers, but are subject to additional constraints, particularly on distance. See the L
ON W ORKS LPT-10 Link
Power Transceiver User's Guide for more information.
• The average temperature of the wire must not exceed +55°C, although individual segments of wire may be
as hot as +85°C.
• As a general rule, the TP/FT-10 channel communication cables should be separated from high voltage power
cables. Follow local electrical codes with regard to cable placement.
Transmission Specifications
Table 5.1 Doubly-Terminated Bus Topology Specifications
A doubly-terminated bus may have stubs of up to 3 meters from the bus to each device.
Cable Maximum bus length (Meters)
Belden 85102 2700
Belden 8471 2700
Level IV, 22AWG 1400
JY(St) Y 2x2x0.8 900
TIA Category 5 900