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RAD Data Communications 2011 Catalog

COPPER MODEMS

ASM-40

High Speed Short Range Modem

•

Selectable data rates: 32 kbps to

2.048 Mbps

•

Range up to 1.75 km (1.1 miles)

•

V.54 diagnostics

•

Digital interfaces: V.24, V.35, X.21,

RS-530, V.36/RS-449, Ethernet (bridge)

or G.703 (HDB3)

•

Optional built-in router

The ASM-40 is a high speed synchronous short

range modem operating at 13 selectable data

rates, from 32 kbps up to 2.048 Mbps with a

range up to 1.75 km (1.1 miles).

The modem transmits data to the line at four

data rates, depending upon the selected DTE

rate or the PCM network. Data rates of 32, 64,

128, 256, 512, 1,024 and 2,048 kbps are

transmitted at 2,048 kbps; data rates of 192,

384, 768 and 1,536 kbps are transmitted at

1,536 kbps; the 1,544 kbps data rate is

transmitted at 1,544 kbps; and the 1,920 kbps

data rate is transmitted at 1,920 kbps.

The modem’s line interface is coded using

HDB3, AMI or B8ZS (strap-selectable). On the

digital side, a choice of V.35, V.36/RS-449, X.21,

RS-530, built-in Ethernet bridge, router or

G.703/HDB3 interfaces is available. This also

enables the ASM-40 to perform as an interface

converter, a rate converter or a repeater for G.703.

The ASM-40 features V.54 diagnostic capabilities

to perform local analog loopbacks and local and

remote digital loopbacks. An internal test

pattern complying with the V.52 standard can be

generated to provide end-to-end integrity

testing.

The ASM-40 is available as a standalone unit or

as a card for the 19-inch ASM-MN-214 rack that

holds up to 14 cards (see page 127).

For latest updates visit www.rad.com

•

Selectable data rates:

– 1.2 kbps up to 128 kbps (sync)

– Up to 38.4 kbps (async)

•

2-wire full duplex

•

Adaptive echo canceller

•

Range up to 8 km (5 miles) over

24 AWG lines

•

2B1Q line code

•

DTE interfaces: V.24/RS-232, V.35, V.36,

RS-530, X.21, Ethernet (bridge) or G.703

codirectional (64 kbps)

•

Optional built-in router

ASM-31

2-Wire Multirate Short Range Modem

The ASM-31 multirate sync/async short range

modem operates full duplex over a 2-wire

twisted pair. The ASM-31 can operate at

selectable data rates from 1.2 kbps to 128 kbps.

Full duplex operation is achieved using the

adaptive echo cancellation technique. This

method entails setting one modem as a master

and the other as a slave (switch-selectable).

2B1Q line coding provides an operating range of

up to 8 km (5 miles) for all data rates, with an

internal rate converter that converts all DTE data

rates to a line data rate of 128 kbps.

Local and remote loopbacks can be activated

from either side of the line, to test both

modems and the line. Loopbacks are controlled

by a manual switch or from the DTE interface.

The modem includes a BER tester for complete

end-to-end integrity testing. An error LED

indicates each bit error detected. The ASM-31

has line protection circuits against lightning and

power surges.

Interface options include V.24/RS-232, V.35, V.36,

X.21, RS-530, built-in Ethernet bridge, router, and

G.703 codirectional 64 kbps. The analog line

connectors are RJ-45 and terminal block.

The ASM-31 is available as a standalone unit or

as a card for the 19-inch ASM-MN-214 rack that

holds up to 14 cards (see page 127).

2-wire

ASM-31

8km(5 miles)

Bridge/router

V.35

ASM-31

Ethernet

For latest updates visit www.rad.com

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