User's Manual

ITCR Wayside User’s Manual
© 2013 Meteorcomm LLC. All Rights Reserved. Proprietary and Confidential
2 5/16/2013
other possible track condition indicators. The WIU formats the status information
into a short message called an aspect. The aspect is sent to the Wayside radio for
packetized RF transmission.
1.3 Chassis
Wayside radios are housed in electrically sealed metal cases. The Wayside radio
dimensions are approximately 15.5W X 9.5 H X 2.0D. It weighs less than 8 lbs.
All input/output ports are grounded and/or shielded. In addition, best engineering
practices have been employed with respect to internal shielding, unit assembly and
PCB design in an effort to minimize potential sources of unwanted radiated
emissions.
1.4 Ports and Ethernet Connectors
The Wayside radio has two RJ45 Ethernet I/O ports, marked LAN and MAINT, each
on its own network.
1.5 Power Connectors
The Wayside radio power input connector is a Wago type for 13.6 VDC nominal, min
10.9 VDC and max 15.5 VDC.
1.6 Antenna Connectors
The 30W PEP rated 220-222 MHz wayside radio transmitter has an N-type antenna
connector and expects a nominal 50 ohm resistive load, max VSWR 3:1. It also has a
TNC connector for the GPS antenna. The GPS antenna can be active (3.3Vdc, 50mA
max) or passive.
2. Important Information for the User
2.1 Transmitter Warm-Up Period.
The wayside transmitter uses a temperature compensated crystal oscillator (TCXO)
to achieve frequency accuracy and stability. No warm-up period is required beyond
the built-in radio startup delays.