Echelon LonWorks Twisted Pair Control Module - Manual (Page 29)

LonWorks Twisted Pair Control Module User's Guide 21
Wire Characteristics
Due to the many cabling and termination options available for the TP/FT-10
channel, please refer to the Series 5000 Chip Data Book, FTT-10 Free Topology
Transceiver User's Guide, or FTT-10A Free Topology Transceiver User's Guide, as
applicable, for information on wire characteristics and terminations.
The Junction Box and Wiring Guidelines for Twisted Pair LonWorks Networks
engineering bulletin (005-0023-01) provides a list of cable vendors for each type of
supported cable. This bulletin is available from the Echelon Web site
( www.echelon.com ).
Cable Terminations – Free Topology
In a TP/FT-10 free topology segment, only one termination is required and can be
placed anywhere on the free topology segment. There are two choices for the
termination:
1. RC network (see Figure 10), with R1 = 52.3 Ω.
2. LPI-10 or LPI-11 Link Power Interface, with jumper at "1 CPLR" setting.
Figure 10. RC Network Termination for TP/FT-10 Segments
Cable Terminations – Doubly Terminated Bus
In a TP/FT-10 doubly terminated bus topology, two terminations are required,
one at each end of the bus. There are two choices for each termination:
1. RC network (see Figure 10), with R1 = 105 Ω.
2. LPI-10 or LPI-11 Link Power Interface, with jumper at "2 CPLR" setting
if resident on a link power segment. Only one LPI-10 or LPI-11 Interface