Chapter 7 Network communication
92 BMTX-SVN01C-EN
Fiber-optics used for Ethernet communication
Fiber-optic cable can be used for networks involving long distances, inter-
building cabling, and areas with a potential for electrical noise. Fiber
optic signals are less susceptible to electrical noise, including lightning,
EMI/RFI, voltage conductors, and ground loops. See Figure 29 on page 94
for an example of inter-building fiber-optic cabling for an IP network.
Trane requires duplex, 62.5 μm core glass fiber-optic cable with ST con-
nectors, which comes in a variety of types for specific applications, such as
indoor, outdoor, burial, aerial, and duct. You can order fiber-optic cable,
fiber-optic modems, ST-type crimp connectors, epoxy connectors, and
other accessories from Trane Buying Group suppliers.
IMPORTANT
Trane recommends that only qualified and experienced fiber-optic tech-
nicians prepare the fiber-optic end connectors and cable run lengths.
Improper methods may result in faulty communication due to signal
degradation (decibel loss), which must be less than 14 dB on each fiber.
Fiber-optic media converter
The fiber-optic media converter that Trane supports for connecting fiber-
optic cable to 10BaseT wire is Connect Air Int. W4869 (shown in
Figure 28 on page 92). The fiber-optic media converter that Trane sup-
ports for connecting fiber-optic cable to 100BaseT wire is Allied Telesyn
AT-MC101 XL. These devices convert the electrical signals from a twisted
pair of wires to optical signals, which are sent over the fiber-optic cable.
See Figure 29 on page 94 for an example of inter-building fiber-optic
cabling for an IP network.
One end of the media converter provides a port for a fiber-optic cable (TX
and RX). At the same end is a 10BaseT port for connecting the media con-
verter to the BCU. At the other end is a 12 Vdc port to connect power to
the media converter. See Figure 28.
Figure 28. Fiber-optic media converter/repeater for 10BaseT wire
(Connect Air Int. W4869)
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