Echelon Series 6000 Chip databook - Manual (Page 108)

Cable Type
Maximum Device-to-
Device Distance (Meters)
Maximum Total Wire
Length (Meters)
J-Y(ST)Y 2x2x0.8 320 500
ANSI/TIA/EIA Category 5 / 6 250 450
The free topology transmission distance specification includes two components that 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 device-to-device distance. If multiple paths exist, for example, in a loop
topology, then the longest path should be used for calculations. The maximum total wire
length is the total length of wire within a segment.
Cable Termination and Shield Grounding
TP/FT-10 network segments require termination for proper data transmission performance.
The type of terminator varies depending on whether shielded or unshielded cable is used.
Free Topology and bus topology networks also differ in their termination requirements. The
following sections describe the various terminators and termination procedures.
Free Topology Network Segment
For a Free Topology segment, only one termination is required; it can be placed anywhere on
the Free Topology segment. There are two choices for the termination:
• RC circuit, with Ra = 52.3 Ω ±1%, 1/8 W
• LPI-10 Link Power Interface, with jumper at the “1 CPLR” setting
Figure 41 shows the RC circuit for twisted-pair termination.
Doubly Terminated Bus Topology Segment
For a doubly terminated bus topology, two terminations are required: one at each end of the
bus. There are two choices for each termination:
• RC circuit, with Ra = 105 Ω ±1%, 1/8 W
• LPI-10 Link Power Interface, with jumper at the “2 CPLR” setting
Only one LPI-10 interface is supported per segment. The LPI-10 contains the two required
terminators. The other terminator must be an RC-type.
Figure 41. Twisted-Pair Termination
96 Network Cabling and Connections for FT Devices