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

•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

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4-wire

SRM-5S

SRM-5S

 

Sync

Sync

terminal

computer

 

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

SRM-5SC, SRM-6SC

Sync Multipoint Short Range Modems

•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

Visit www.rad.com for latest product updates

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).

TX

TX

RX

RX

SRM-6SC

SRM-5SC

Sync

TX

computer

RX

 

 

SRM-5SC

 

TX

 

RX

 

SRM-5SC

 

Sync

 

terminal

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

150 RAD Data Communications 2006 Catalog