RAD Data comm 4-Wire Symmetrical VDSL Modem ASM-60 Instrukcja Użytkownika Pobierz pdf (Strona 4)

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RAD Data Communications 2009 Catalog

The ASM-20 is a synchronous/asynchronous

short range modem operating at selectable

rates from 19.2 kbps to 256 kbps, full or half

duplex over twisted pair, unconditioned lines. It

has a range of 7.5 km (4.7 miles) at 64 kbps.

The modem uses conditional diphase

modulation (EUROCOM Std. D1), which provides

immunity to background noise, eliminates

normal line distortion and enables efficient

transmission over twisted pair. Transmit timing

is provided internally, derived externally from the

DTE or recovered from the receive signal. The

carrier may be continuous or controlled for

passing control signals end-to-end.

The ASM-20 features diagnostic capabilities,

complying with the V.54 standard to perform

local and remote loopbacks. A built-in bit error

rate tester (BERT), activated and monitored from

the front panel, complies with the V.52 standard

to enable complete testing of both modems and

the line.

Several interface options are available:

V.24/RS-232, V.35, V.36, X.21, RS-530, built-in

Ethernet bridge, and G.703 codirectional

(64 kbps).

The ASM-20 has line protection circuits against

lightning and power surges. It 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 144).

Approximate Range for 24 AWG (0.5 mm)

Data Rate

(kbps) km miles

19.2 9.7 6.0

32 8.7 5.4

64 7.5 4.6

128 5.0 3.1

144 4.5 2.8

256 2.2 1.4

C O P P E R M O D E M S

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Selectable data rates:

– 1.2 kbps up to 128 kbps (sync)

– Up to 38.4 kbps (async)

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2-wire full duplex

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Adaptive echo canceller

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Range up to 8 km (5 miles) over

24 AWG lines

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2B1Q line code

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

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

codirectional (64 kbps)

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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 144).

2-wire

ASM-31

8 km (5 miles)

Bridge/router

V.35

ASM-31

Ethernet

Selectable data rates:

For latest updates visit www.rad.com

•

Selectable data rates from 19.2 kbps

to 256 kbps

•

Full or half duplex over 4-wire

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Range up to 7.5 km (4.6 miles) at

64 kbps

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Built-in BER tester

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V.54 diagnostics

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Automatic equalizer

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

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

codirectional (64 kbps)

ASM-20

Sync/Async Short Range Modem

For latest updates visit www.rad.com

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