User's Manual

5
To be used only for the purpose for which it is submitted. All rights reserved to AMDS LLC. Reproduction without written
consent is prohibited.
AMDS CONFIDENTIAL
1.4.3 General Information
The TGB Transceiver is a high performance burst data radio system. The RF
receiver is configured to receive 3 distinct modulation schemes on 3 adjacent
frequencies in the 896 to 940 MHz frequency range.
The TGB RF Transmitter operates on a single configurable channel (12.5kHz,
13.6 KHz, or 25kHz authorized bandwidth depending on the channel and
FCC Rule section governing it’s operation) in the 935 to 960 MHz frequency
range. The transmitter utilizes yet another type of modulation scheme,
different from the three utilized by the receiver.
Transmitted and received data messages are short in nature, meaning that
the radio is intended for burst telemetry type of applications. Larger packets
may, however, be transmitted by sending successive packets.
The TGB operates as a multi-channel transceiver in a “cellular” type system.
The TGB assembles the received messages and forwards them to the TGB
Controller (one per city) via local phone lines. The TGB Controller eliminates
redundant messages (i.e., messages from endpoints that were received by
more than one TGB) before forwarding them to the NOC via a high-speed
connection (ISDN, T1, etc).
The TGB shall also notify the NOC of any alarm indications, such as
tamper/intrusion, temperature alarms, or power failure.
The TGB is installed inside an equipment enclosure containing a 24 VDC
power supply and battery charger (FCC Part 15 Class B Compliant), a cavity
duplexer/combiner allowing for single antenna operation, and all necessary
grounding and lightning protection hardware needed to protect the TGB under
normal operation.