Datron TW7201I, Manual

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1: Introduction
TW7201I-MS 1-3
1.3 TW7000 Series Family
The TW7000 series is a complete family of RF communications equipment
that includes the following components:
• Transceivers (TW7000, TW7000F)
• Internal options
• External options
• Accessories
• Remote control devices
The TW7201I modem operates in conjunction with an DHSL modem (7000RI
option) installed in a TW7000 series transceiver. The two modems connect
through a 2-wire remote line.
1.3.1
Front Panel
Control
When using transceivers such as the TW7000 that include front panel
controls, the transceiver controls are the master. In this case, the transceiver
controls are live from the transceiver and TW7201I. For security and limited
operation applications, the key functions can be inhibited at either the
transceiver or TW7201I control panels. Two variations of the TW7000 series
transceivers, the TW7000E and TW7000C, do not include control panels.
1.3.2
7000RI Option
The TW7000 series transceiver must have a 7000RI option installed to
communicate with the TW7201I remote head. The 7000RI option includes the
DHSL Modem board, and a dual UART chip and two jumpers that must be
installed on the transceiver Processor board.
1.3.3
TW7201I
DHSL Remote
Control
The TW7201I includes a DHSL Modem board that communicates with the
DHSL Modem board (7000RI option) installed in the transceiver through a
remote line using a high speed data packet format. The information is
compressed and sent between the master (transceiver) and slave (remote
head). Line loss and balance variations do not effect the system performance.
The DHSL modem requires wide bandwidth so it does not work over standard
analog telephone channel. This system is ideal for distances of 1.6 km (1 mile)
or less (2 km max.) over a 2-wire pair.
Voice Channel The TW7201I provides one voice channel. The voice audio is digitized before
being sent over the modem link. This provides excellent voice quality even
with poor line conditions and requires no adjustment even when line
conditions change.
Data Channels The TW7201I provides two data channels, using one channel for
communications between the transceiver and the remote head. The other data
channel is a spare, normally used by accessory equipment or other special
functions. The second channel is typically used for an external computer