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RAD Data Communications 2006 Catalog
MINIATURE SHORT RANGE MODEMS
SRM-31S
Miniature Multirate 2-Wire Modem
The SRM-31S miniature synchronous
modem operates full duplex over a single
pair of wires. It supports data rates from
1.2 kbps 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.
SRM-31S
128 kbps
2-wire
8km
(5 miles)
LRS-24
ASMi-31-2C
Digital
Network
DTE
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• 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)
SRM-8H
High Speed Short Range Modem
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)
SRM-8H SRM-8H
IBM 37X5
56/64 kbps
4-wire
IBM 3174
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• 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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