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SPEEDCOM 128/256
High Performance Voice &
Data Modems
Benefits & Features
• License-free in most
countries
• 900 MHz and 2.4 GHz
• Fully software configurable
• Distances of up to 50 Km or
longer
• Up to 256 Kbps full-duplex
• Point-to-point, or
point-to-multipoint
• Automatic RF channel
selection
• Optional Battery Back-up
The SPEEDCOM 128/256 line of spread spectrum radios provides an off-the-shelf,
ready-to-install solution to a number of long-range communication applications. The
product was designed from the ground up with emphasis on performance, reliability, and
flexibility and has been qualified under the most stringent temperature, shock, and
vibration conditions.
The high processing gain of the SPEEDCOM 128/256 offers substantial immunity to
interference. The SPEEDCOM 128/256 offers an automatic RF channel selection option which
finds a clear channel within 300 ms after inter-ference has interrupted communications. In
contrast, with fixed-frequency radios, communications may stop until the equipment is
manually reset to a clear channel.
The SPEEDCOM 128/256 can be configured for TDMA operation, allowing multiple radios to
share one channel without mutual interference. TDMA is essential when the number of
communication links required in a limited geographical area exceeds the number of
available channels. For example, if 12 channels are available, 48 links can operate at one
quarter of the data rate, with four links sharing each channel.
To address this problem, SPEEDCOM International has separated the 2.4-GHz radio into two
sections: an indoor unit, operating at a lower intermediate frequency, and an outdoor
up/down converter located at the antenna. The up/down converter includes the system's
low-noise 2.4 GHz receiver and the transmitter power amplifier, so the received and
transmitted signals are not degraded by cable losses. Between the up/down converter and
the indoor unit, signals are at a lower frequency, so losses are substantially reduced.
This allows the use of less expensive cable with no loss of transmitter output power and
receive sensitivity.
The SPEEDCOM 128/256 can be set up for a wide variety of network configurations, as shown
in the figures on the next page. These configurations include point-to-point networks,
multiple-point-to-point networks, and point-to-multipoint links. The SPEEDCOM 128/256 can
also be set up as a repeater when a line-of-sight obstruction must be bypassed or ranges
greater than 50 km are required.
The SPEEDCOM 128/256 is shipped ready to operate with default parameters that are suitable
for most applications. However, a large number of parameters are configurable, allowing
the user to customize the radio for many non-standard applications. Some of the
programmable parameters include:
• Separate
transmit and receive channels in 128 KHz steps. • Spreading
Codes and code length (15/31/63).
• BPSK or QPSK modulation
• Number of TDMA slots and slot
time
• Synch/asynch modes, data
rates, and clock sources
• RS-232, EIA530 (RS-422), or
V.35 electrical interfaces
• RTS/CTS flow control options
These and other parameters are easily configurable using either a menu
driven command interface, or a Hayes compatible command set sent by a terminal connected
to the radio's rear panel connector. Configuration changes can be stored in the radio's
non-volatile memory and automatically recalled on power up.
General Specifications
Electrical
Input Power
115 or 230 Vac (external supply)
or 8-16 Vdc
Power Consumption
15 W
Battery Backup
N/A
Data and Interface Control
DB25 female (optional interface modules available for EIA530 or V.35)
Mechanical, Indoor Unit
Dimensions
41/4" W x 11/2" H x 61/2" D
Weight
30 oz. (850 g)
Mechanical, Outdoor Unit
2.4 GHz
Dimensions
5.95" diameter (round) x 1.31" D
Weight
40 oz. (1.12 Kg)
Enviromental
Operating Temperature
-40 to +75 oC
Maximum Humidity
90 % non-condensing
Certifications
IC Canadian 2348101379
ETSI European Pending, FCC Part 15 Identifiers
LFO-ISM900, LFO-ISM2400
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