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-31S

Miniature Multirate 2-Wire Modem

•Full duplex transmission over 2 wires in synchronous transmission

•Data rates up to 128 kbps

•Transmission range up to 8 km (5 miles), independent of data rate

•Supports IDSL technology (ISDN, U interface)

•Works opposite the ASMi-31 modem, including remote control and monitoring, and LRS-24 modem rack (ASMi-31-2C)

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The SRM-31S miniature synchronous modem operates full duplex over a single pair of wires. It supports data rates from

1.2kbps to 128 kbps. The transmission range is up to 8 km (5 miles) over 24 AWG cable, independent of the data rate.

IDSL technology (ISDN, U interface) provides extended range and efficient transmission over a single copper pair.

The SRM-31 can operate opposite the ASMi-31 modem, supporting remote control

and monitoring. When the ASMi-31 is a card in the LRS-24 rack, the SNMP central management station can perform control and monitoring of the remote SRM-31.

Power is provided by a wall-mounted power supply that is supplied with the product.

End-to-end signaling is available with no interference to data transmission. The user can select between RTS/DCD and DSR/DTR end-to-end signaling options.

ASMi-31-2C

 

 

 

2-wire

SRM-31S

Digital

 

 

Network

8 km

 

 

128 kbps

 

 

LRS-24

(5 miles)

DTE

SRM-8H

High Speed Short Range Modem

•Selectable sync or async operation

•V.54 local and remote diagnostics

•Full or half duplex operation over 4 wires

•Selectable data rates: 56 or 64 kbps

•Range up to 4.5 km (2.8 miles) for 24 AWG

•Controlled or continuous carrier

•Four interfaces: RS-232/V.24, V.35, X.21, RS-530

•Four LED indicators

•Powered via wall-mount power supply

•Line connector options: terminal block, RJ-12 and RJ-45

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4-wire

 

56/64 kbps

IBM 37X5 SRM-8H

SRM-8HIBM 3174

The SRM-8H is a high speed short range modem operating full duplex over twisted pair, unconditioned telephone lines. It has an extended range of 4.5 km (2.8 miles) for 24 AWG at data rates of 56 or 64 kbps.

The SRM-8H has diagnostic capabilities complying with ITU V.54 standard. Two loops are available: local analog loop and remote digital loop.

The modem’s carrier can be strapped for either continuous or switched operation, controlled by the RTS signal, for passing control signals.

Transmit timing can be selected for internal, external or loopback clock. Four LED indicators monitor Transmit Data, Carrier Detect, Test and Power.

Four interface models are available: RS-232/V.24, V.35, X.21, and RS-530.

Power is provided by a standard wall- mounted power supply. Connection of modems to the line is usually via a 5-screw terminal block. Other connectors available are RJ-12 and RJ-45.

The modem is also available as a card version for mounting in a 19" rack (see the CMN-16 nest, card CMN-C8H).

Approximate Range (at 56/64 kbps)

Gauge

19 AWG

24 AWG

26 AWG

 

(0.9 mm)

(0.5 mm)

(0.4 mm)

 

 

 

 

Range

10 km

4.5 km

3.2 km

 

(6.0 miles)

(2.8 miles)

(2.0 miles)

148 RAD Data Communications 2006 Catalog