Black Box ME376A-R2 Manuel utilisateur

For sending sync or

async data.

2-wire, twisted-pair

operation.

Transmit speeds up to

38.4 or 128 kbps.

Distances up to

3.4 miles 5.5 km).

Full-duplex operation

using “echo

cancellation.”

Performs local analog

loopbacks and local

and remote digital

loopbacks.

Generates bit error

rate test patterns.

Isolation transformer

guards versus AC or

DC overvoltages.

he BLACK BOX

V.35 2-Wire

Short-Haul Modem rovides a

sim le way to send your data at

short distance over telco lines.

The modem o erates full-du lex

synchronously over a single 2-wire

twisted air, at selectable data

rates from 600 b s u to 128 kb s,

or asynchronously u to 38.4 kb s.

The short-haul modem

incor orates interface circuits

for the terminal or com uter, an

ada tive echo-canceler, an

automatic ada tive equalizer, a

modulator, and a demodulator. The

ada tive equalizer rovides noise

immunity and high erformance

over low-quality lines.

The modem uses 2B1Q line

coding and rovides an o erating

range of u to 3.4 miles (5.5 km)

over 26 AWG twisted- air wire—

no matter what data rate is used.

The modem also cou les to the

tele hone line through an isolation

transformer that rotects against

AC or DC overvoltages.

The rotection circuitry enables

the unit to survive even if DC is

connected to the line accidentally.

ASYNC/SYNC 2-WIRE SHORT HAUL MODEM

DIG ANA

PWR RTS TD RD DCD LOS ERR TEST REM PATT

RESET

Send sync or async data up to 3.4 miles (5.5 km)

over your existing 2-wire twisted-pair lines.

KeyFeatures

V.352-WIRESHORT-HAULMODEM

Full-du lex o eration uses

echo cancellation. You need only

to set one modem to be a master

and the other to be a slave.

Internal DIP-switch controls

enable you to configure the V.35

2-Wire Short-Haul Modem to suit

your a lication. To reconfigure

the modem for a different ty e

of o eration, just re osition the

switches.

The short-haul modem also

features diagnostic ca abilities,

including local analog loo back

and local and remote digital

loo back. An o erator at either end

of the link can test both local and

remote short-haul modems as well

as the line itself. Control loo back

with either the unit’s front- anel

ushbuttons or signals assed

through the DTE (PC, data terminal)

interface. Pressing the front- anel

Pattern button causes the local

short-haul modem to send the

remote unit a continuous Bit Error

Rate Test (BERT) attern. By

erforming these end-to-end tests,

you can ensure link integrity and

quickly find out which com onents

of your short-haul modem system

are o erating ro erly and which

aren’t.

For monitoring and

troubleshooting ur oses, the

short-haul modem has eight front-

anel LEDs that inform you of the

device’s o erational status and

activity. At a glace, you can tell

whether the local and remote units

are in sync, when the RTS signal

from the DTE is high, when the

local unit is transmitting or

receiving data, when the modem

detects an error in the BERT

attern, and more.

For your transmission line, we

highly recommend using twisted-

air cable ca able of su orting

high data rates, es ecially

Category 3 grade or better. For

DTE-side cable runs, use straight-

through- inned cable that’s no

more than 25 feet (7.6 m) long with

an M/35 male connector for

lugging into the V.35 2-Wire

Short-Haul Modem.

NOTE: Must be used in airs.

Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Su ort: 724-746-5500 • www.blackbox.com • e-mail: [email protected]

Black Box Cor oration.

11/18/2004 #14072

Approvals: FCC Part 15 Sub art B

Class A, DOC Class/MDC classe

Al; CE (ME376AE-R2 version)

Clocking: Internal, external, receive

Data Format: 7 or 8 data bits; 1 or 2

sto bits; even, odd, or no arity

(user-selectable)

Speed (Maximum): 128 kb s

synchronous, 38.4 kb s

asynchronous

Diagnostics: V.54-com liant

loo back tests: local analog

loo back (switch- or signal-

triggerable); local digital

loo back (switch-triggerable);

remote digital loo back (switch-

or signal-triggerable)

Distance (Maximum): DTE side:

25 ft. (7.6 m);

Line side: 3.4 mi. (5.5 km) over

26 AWG wire

Operation: Line side: Full du lex

with echo cancellation

Protocols: DTE side: Sync or async;

Line side: 2B1Q encoding

Standard: T1: ANSI T1.601.1988

Transmission evel: U to 14 dBm

MTBF: 75,500 hours

User Controls: (5) front-mounted:

(4) ushbuttons: DIG (local

digital loo back), ANA (local

analog loo back), REM

(remote digital loo back),

PATT (test attern);

(1) Recessed RESET switch;

(6) internal: (1) 7- osition DIP

switch for rotocol, data

format, signaling o tions;

(1) rotary switch for data rate;

(4) jum ers for clock source,

loo back testing, ground

connection

Interface: 2-wire telco, ITU-TSS

(CCITT) V.35

Connectors: V.35: (1) M/34 F;

Line side: (1) RJ-45, (1) 3-screw

terminal block

Indicators: (8) front-mounted LEDs:

PWR (Power), RTS, TD, RD, DCD,

LOS (Loss Of Signal), ERR (Error),

TEST

Temperature Tolerance:

32 to 122˚F (0 to 50˚C)

Humidity Tolerance: U to 90%,

noncondensing

Power: ME376A-R2:

103.5–131.5 VAC, 47–63 Hz;

ME376AE-R2: 207–253 VAC,

47–63 Hz

Size: 1.8"H x 7.7"W x 9.7"D

(4.6 x 19.6 x 24.6 cm); but the

unit’s ushbuttons rotrude u to

0.1" (25 mm) from the front anel

and the connectors rotrude u

to 0.8" (2 cm) from the rear anel

Weight: 3.1 lb. (1.4 kg)

Specifications

Ordering Information

ITEM CODE

V.35 2-Wire Short-Haul Modem

103.5–131.5-VAC...............................................ME376A-R2

207–253-VAC...................................................ME376AE-R2

NOTE: Must be used in airs.

You may also need…

V.35 Interface Cable,

10-ft. (3-m) Male/Male ........................EYN450-0010-MM

GigaBase®350 350-MHz CAT5e Bulk Cable, 4-Pair, PVC,

1100-ft. (335.3-m) Boxed Reel, Blue........EYN851A-1100

Recogni e any of these

situations?

• You wait more than 30

minutes to get through to a

vendor’s tech su ort.

• The so-called “tech” can’t

hel you or gives you the

wrong answer.

• You don’t have a urchase

order number and the tech

refuses to hel you.

• It’s 9 . m. and you need hel ,

but your vendor’s tech

su ort line is closed.

According to a survey by Data

Communications magazine, 90%

of network managers surveyed

say that getting the technical

su ort they need is extremely

im ortant when choosing a

vendor. But even though network

managers ay anywhere from 10

to 20% of their overall urchase

rice for a basic service and

su ort contract, the technical

su ort and service they receive

falls far short of their

ex ectations—and certainly isn’t

worth what they aid.

At Black Box, we guarantee

the best value and the best

su ort. You can even consult our

Technical Su ort Ex erts before

you buy if you need hel selecting

just the right com onent for your

a lication.

Don’t waste time and

money—call Black Box today.

WhyBuyFromBlackBox?Exceptional

Value.ExceptionalTechSupport.Period.

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