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MINIATURE SHORT RANGE MODEMS
149
RAD Data Communications 2006 Catalog
12
MINIATURE SHORT RANGE MODEMS
SRM-5AC, SRM-6AC
Asynchronous Multipoint Short Range Modems
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
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).
Visit www.rad.com for latest product updates
• 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
SRM-6AC SRM-5AC
SRM-5AC
SRM-5AC
Async
computer
Async
terminal
TX
RX
RX
TX
RX
TX
RX
TX
SRM-5A, SRM-6A, SRM-6L
Asynchronous Short Range Modems
19.2 kbps with a range of 4.5 km (2.8 miles)
at 9.6 kbps. The SRM-6L operates at data
rates of up to 19.2 kbps up to a range of
3.2 km (2 miles).
The SRM-5A is fully compatible with the
SRM-6A and offers the same features in
half the size.
The SRM-6L offers the unique feature of
insensitivity to wire polarity: There is no
need to observe + and – connections when
using twisted pairs, making it easy to install
and maintain.
The DCE/DTE switch allows operation as a
DTE for connection to another DCE, without
requiring a cross cable. All three units
operate 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.
The SRM-5A modem is available with an
internal filter (optional for the SRM-6A). The
filter is designed to overcome radiated and
conducted interference for high noise
immunity.
The SRM-6A is also available as a card for
mounting in a 19" rack (see the CMN-16
nest, card CMN-6A).
Approximate Range (for 24 AWG/0.5 mm)
Data Rate
kbps km miles
19.2 2.0 1.2
9.6 4.5 2.8
4.8 5.0 3.0
1.2–2.4 5.5 3.4
Visit www.rad.com for latest product updates
• 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)
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
SRM-6A
Async
computer
4-wire
Async
terminal
SRM-5A
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