Codan NGT 2010 RF, Техническое и сервисное руководство, Страница: 712 / 840

3012—Overview and specifications
292 NGT Transceiver System Technical Service Manual
Overview
The HF Data Modem 3012, when combined with the appropriate Codan HF transceiver
and computer terminal, provides error-free transmission and reception of data on an HF
channel. It is particularly useful for long-range communications in remote areas where
existing communication infrastructures are poor or non-existent.
The data modem operates at 12 V DC in fixed base and mobile installations. The data
modem receives DC power from the transceiver via its 15-way GPIO connector. It
incorporates data compression to boost effective throughput, and is easily integrated with
Codan voice and signalling networks.
A typical HF Data Modem 3012 station comprises:
• HF Data Modem 3012
• Codan ‘data-capable’ HF transceiver
• transceiver supply
• computer terminal with appropriate communications software
• antenna system
The basic layout of a 3012 data system is shown in Figure 1 .
Figure 1: Basic layout of a 3012 data system
The data modem may be controlled using standard AT commands from a terminal.
Virtually any software that operates on standard telephone modems will operate over HF
via the AT commands.
The data modem is able to send email over HF with other third-party email software.
Channel selection
HF channels may be manually selected using the transceiver or the data modem.
If a data call is sent while the Codan HF transceiver is scanning an ALE/CALM network,
the transceiver automatically selects a channel from the ALE/CALM network.
Codan HF
transceiver*
with power
supply
Data
modem
Computer
* Codan HF transceiver may be:
2010 RF Unit, 2030 Junction Box, and 3020 Transceiver Supply
2012 RF Unit and 3020 Transceiver Supply
2110 Manpack Transceiver