RAD Data comm 146 - Manual (Page 5)

150
RAD Data Communications 2006 Catalog
M I N I A T U R E S H O R T R A N G E M O D E M S
SRM-5S
Synchronous Short Range Modem
The miniature SRM-5S is a short range
modem connecting full duplex synchronous
terminals, controllers and computers. It
operates at nine data rates up to 19.2 kbps.
When operating at 9.6 kbps, the modem
supports ranges up to 5 km (3.0 miles).
The modem operates without external
power, by drawing low power from the data
and control signals.
Connection to the line is through isolation
transformers for protection against AC or DC
overvoltages. Transmit timing is provided by
an internal clock.
The unit has an RS-232/V.24 interface and is
available with an integral male or female
25-pin connector for the DTE interface and
a 5-screw (4-wire and ground) terminal
block for the line.
The SRM-5S has both a terminal block and
an RJ-45 or RJ-12 line connector.
The modem is also available as a card for
mounting in a 19" rack.
Approximate Range (for 24 AWG/0.5 mm)
Data Rate
kbps km miles
19.2 4.0 2.5
9.6 5.0 3.0
4.8 5.5 3.4
2.4 5.5 3.4
1.2 6.0 3.7
4-wire
SRM-5S SRM-5S
Sync
computer
Sync
terminal
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• 4-wire, full duplex
• Selectable data rates up to 19.2 kbps
• Range up to 5 km (3.0 miles) at 9.6 kbps
• Full or half duplex, point-to-point
• LED indicator for carrier detect
• No external power required
• Line connector options: terminal block,
RJ-12 and RJ-45
SRM-5SC, SRM-6SC
Sync Multipoint Short Range Modems
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• 4-wire, full or half duplex
• Selectable data rates: 1.2 to 19.2 kbps
• Range up to 5 km (3 miles) at 9.6 kbps
• Transfers one control signal
• Internal, external or loopback clock
• No external power required
• LED indicator for carrier detect (SRM-5SC only)
• Line connector options: terminal block, RJ-12
and RJ-45
The miniature SRM-5SC and SRM-6SC are short range
modems connecting full or half duplex synchronous
terminals, controllers and computers in point-to-point or
point-to-multipoint applications. The modems operate at
data rates from 1.2 kbps to 19.2 kbps (selectable) with
a range of 5 km (3.0 miles) at 9.6 kbps.
The SRM-5SC is a fully compatible sub-
miniature model of the SRM-6SC, offering
the same features in half the size.
Three alternative sources for transmit timing
are available: internal oscillator, external
clock from the terminal or loopback clock
derived from the receive signal. The carrier
can be strapped for continuous operation or
switched operation controlled by the RTS
signal.
The units have an RS-232-C/V.24 interface,
and are available with a choice of a male or
female integral 25-pin connector for the DTE
interface and a 5-screw (4-wire and ground)
terminal block for the line. Optional line
connectors available for the SRM-6SC are
RJ-12 and RJ-45. The SRM-5SC has both a
terminal block and RJ-45 or RJ-12 as its line
connectors. The modem is also available as
a card version for mounting in a 19” rack
(see the CMN-16 nest, card CMN-C6SC).
SRM-6SC SRM-5SC
SRM-5SC
SRM-5SC
Sync
computer
Sync
terminal
TX
RX
TX
RX
TX
RX
TX
RX
Approximate Range (for 24 AWG/0.5 mm)
Data Rate
kbps km miles
19.2 4.5 2.8
9.6 5.0 3.0
4.8 6.0 3.7
1.2 – 2.4 6.5 4.0
147-151_N.QXD 9/11/05 11:12 AM Page 4