Echelon LonPoint Module - Manual (Page 29)

LonPoint Hardware Guide 3-7
Network
Cable
Network
Cable
Ground
Cable
Shield
C1 R2 R4
R1
C2 R3
R1,
R2, R3
R4
C1, C2
+
+
316 ž, 1%, 1/8W
78.7 ž, 1%, 1/8W
150 ž , 1%, 1/8W
100 µ F ± 10%, 50V minimum aluminum-
electrolytic type (observe polarity)
Figure 3.9 Bus Topology Network Terminators for use with Shielded Cables (Two Required)
Network Cabling - TP/XF-1250 Channel
If a high-speed backbone is created using the Model 42102 LPR-12 Routers (TP/FT-10
to TP/XF-1250), then a doubly-terminated bus topology using data grade cable that is
intended specifically for this channel must be installed. The TP/XF-1250 channel can
be used only with Level IV, 22 AWG (0.65mm) twisted pair cable, and the channel
must be terminated at each end with a Model 44200 Terminator (do NOT use the
Model 44100 or 44101 Terminators.) Suppliers of cable are listed in Echelon’s
engineering bulletin, Junction Box and Wiring Guidelines, part number 005-0023-01,
Rev D or higher.
Under no circumstances should smaller gauge Level IV cable be substituted for Level
IV, 22 AWG (0.65mm) twisted pair cable. Echelon periodically qualifies new cables for
twisted pair transceivers, and it is advisable to check with Echelon from time to time
to determine if new cables are available. DO NOT attempt to use any other type of
cabling, including but not limited to Category 5 data cabling, or improper or erratic
operation will result.
A maximum of sixty-four (64) Model 42102 LPR-12 Routers (TP/FT-10 to TP/XF-1250), PC
adapters, and other devices can be installed on a backbone channel, with a maximum
cable length of 130 meters with a maximum stub length of 1 feet (0.3m). If additional
cabling or devices must be installed, then one or more model 42105 LPR-15 (TP/XF-1250
to TP/XF-1250) Routers may be placed in series with the backbone cabling.
Distribution Rule for TP/XF-1250 Channel
Due to the transmission characteristics of the TP/XF-1250 channel, communication
failures may result from reflections of the TPT/XF-1250 transceiver’s 1.25Mbps
transmitted signal under conditions where devices are concentrated in one point of
cabling. These communication failures are eliminated when devices are used in a