•SRM-5A/6A: 4-wire, full duplex

SRM-6L: 4-wire, full or half duplex

•Internal filter for high noise immunity (SRM-5A)

•Insensitive to wire polarity (SRM-6L)

•Data rates up to 19.2 kbps

•DCE/DTE switch

•No external power required

•Transformer line isolation

•Available as a card for 19” rack (SRM-6A)

Visit www.rad.com for latest product updates

The miniature SRM-5A, SRM-6A and SRM-6L are asynchronous short range modems connecting full duplex asynchronous terminals to computers. The SRM-5A and SRM-6A operate at data rates of up to

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

12

SRM-5A, SRM-6A, SRM-6L

 

 

I M

Asynchronous Short Range Modems

 

 

N

 

 

R U T A I

 

 

4-wire

 

 

 

 

E

19.2 kbps with a range of 4.5 km (2.8 miles)

 

 

 

SRM-6A

 

SRM-5A

 

at 9.6 kbps. The SRM-6L operates at data

 

S

 

 

Async

Async

 

terminal

rates of up to 19.2 kbps up to a range of

 

H

computer

 

 

3.2 km (2 miles).

 

 

 

The SRM-5A modem is available with an

O

 

The SRM-5A is fully compatible with the

R

internal filter (optional for the SRM-6A). The

SRM-6A and offers the same features in

T

filter is designed to overcome radiated and

half the size.

 

conducted interference for high noise

R

 

The SRM-6L offers the unique feature of

immunity.

 

 

 

 

A

insensitivity to wire polarity: There is no

 

 

 

The SRM-6A is also available as a card for

N

need to observe + and – connections when

mounting in a 19" rack (see the CMN-16

G

using twisted pairs, making it easy to install

nest, card CMN-6A).

 

 

E

and maintain.

 

Approximate Range (for 24 AWG/0.5 mm)

 

The DCE/DTE switch allows operation as a

M

Data Rate

 

 

DTE for connection to another DCE, without

 

 

 

 

O

kbps

km

miles

requiring a cross cable. All three units

D

 

 

 

operate without external power by drawing

19.2

2.0

1.2

E

low power from the data and control signals.

9.6

4.5

2.8

M

Connection to the line is through isolation

4.8

5.0

3.0

S

transformers for protection against AC or DC

 

 

 

 

 

overvoltages.

1.2–2.4

5.5

3.4

 

SRM-5AC, SRM-6AC

Asynchronous Multipoint Short Range Modems

•4-wire, full or half duplex

•Controlled carrier for multipoint

•Transfers one control signal

•Data rates up to 19.2 kbps

•Range up to 3.5 km (2.2 miles)

•DCE/DTE switch

•LED indicator for carrier detect (SRM-5AC only)

•No external power required

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

•Available as a card for 19” rack

Visit www.rad.com for latest product updates

The miniature SRM-5AC and SRM-6AC are short range modems connecting full or half duplex asynchronous terminals to computers. Featuring carrier control, the modems can be used in multipoint applications and where end-to-end transfer of a control signal is required. They operate at data rates up to 19.2 kbps with a range of up to 3.5 km (2.2 miles) over 24 AWG. The SRM-5AC is a compatible sub-miniature model of the SRM-6AC, offering the same features in half the size.

The carrier can be strapped to be constantly ON, or controlled by the Request to Send signal. A switch-selectable DTE/DCE option allows the modems to operate as a DTE for connection to another DCE, without requiring a cross cable.

The modems are available with an internal filter (optional for the SRM-6AC). The filter is designed to overcome radiated and

TX

RX

RX

TX

SRM-6AC

SRM-5AC

Async

RX

computer

TX

 

 

SRM-5AC

 

RX

 

TX

 

SRM-5AC

 

Async

 

terminal

conducted interference for high noise immunity.

Connection to the line is usually via a

5-screw (4-wire and ground) terminal block. Optional connectors available for the SRM-6AC are RJ-12 and RJ-45. The SRM-5AC has both terminal block and RJ-12 or RJ-45 as its line connectors.

The modems are also available as a card for mounting in a 19" rack (see the CMN-16 nest, card CMN-C6AC).

RAD Data Communications 2006 Catalog

149