Rohde&Schwarz XK2000, GM2200 User Guide

Data sheet

Multistandard HF modem

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Single-tone modem technology

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Short preamble (Rohde & Schwarz

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waveforms)
Forward error correction (FEC)

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HF Modem ¸GM 2200

Fast and reliable data transmission up to 9600 bit/s

Remote control (ASCII code)

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CW suppression

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Compact plug-in module

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Built-in test (BIT)

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Software available for:

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–

–
–
–
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Rohde & Schwarz advanced
waveforms
STANAG 4285
MIL-STD-188-110 A, Section 5.3
STANAG 4529
MIL-STD-188-110 B, App. C/
STANAG 4539, Annex B, Section 4

The multimode HF Modem
¸GM 2200 is currently the most
advanced serial HF data modem and
is fully integrated in the ¸XK 2000
radio equipment family. This modem
can form the backbone of a fast and
reliable data transmission system.

Thus large volumes of data such as fax,
color video still pictures and electronic
mail from PC to PC can be sent rapidly
anywhere in the world.

The modem makes it possible to transmit
data economically and reliably via short­wave at high speed (up to 9600 bit/s) in
contrast to traditional data transmission
techniques such as radioteletype (RTTY)
that allow 50 Bd or 100 Bd only.

The software is available for the
following waveforms:

Rohde & Schwarz advanced

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waveforms
STANAG 4285

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MIL-STD-188-110 A, Section 5.3

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STANAG 4529

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MIL-STD-188-110 B, App. C/

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STANAG 4539, Annex B, Section 4

These waveforms can be ordered in any
combination, i.e. separately and inde­pendently of each other, and enabled in
the ¸XK2000.

Of course, they are interoperable with
the corresponding waveforms of the
earlier ¸GM 2000 and ¸GM 2100
modems, thus enabling problem-free
communication with existing systems
and with modems of other makes.

In conjunction with a system processor/
communication server and appro­priate software and interfaces from
Rohde & Schwarz, offi ce communication
terminals such as fax machines, color
video cameras/monitors or PCs may be
connected and the associated data (in
compressed form to save time) is trans­mitted via shortwave.

A system with the HF Modem
¸GM 2200 and a system processor
coupled with ARQ-supported RSX.25 da­ta protection yields 100 % error-free da­ta when taking all software error cor­rection facilities and data compression
techniques into
account. The transfer time for an A4­size text page is only about 3 s to 6 s and
that for a color picture including com­pression less than half a minute, using
the 5400 bit/s waveform.

The waveforms constitute the basis for
reliable and error-free HF data trans­mission. An ARQ data link protocol en­sures error-free data fl ow. Owing to
our information technology and soft­ware solutions such as COM2000 or
¸PostMan II, the Rohde & Schwarz
2700 bit/s and 5400 bit/s waveforms
are used in connection with the ARQ
RSX.25 protocol. Used for the ALIS
or ALE link establishment method,
this protocol is specially adapted to
the Rohde & Schwarz 2700 bit/s and
5400 bit/s waveforms.

However, waveforms in line with
STANAG and MIL-STD such as the
new 9600 bit/s high-speed waveform
(STANAG 4539, Annex B, Section 4) can­not be used together with the RSX.25
protocol. For these waveforms, radio pro­tocols such as STANAG 5066 are avail­able on request.

2 HF Modem ¸GM 2200