Black Box ME521A, ME521AE, ME521C User Manual

®

®

BLACK

BOX

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© Copyright 1997. All rights reserved.

Black Box Corporation.

Uses your existing

twisted-pair cable.

Standalone unit or

rackmount card available.

Point-to-point or

multipoint.

2- or 4-wire half-duplex,
or 4-wire full-duplex
operation.

Diagnostic LEDs.

Speeds from 1.2 to 256
Kbps.

DB25 to V.35 adapter
included.

T

he V.35 Synchronous

Multipoint Line Driver
(MP485/35) gives you short­haul synchronous data
transmission over your own
twisted-pair cable. The Line
Driver is available as a
standalone unit or a
rackmount card. The
rackmount version is
functionally identical to the
standalone unit. You can
install the Card in a
rackmount chassis that holds
up to 16 cards.

The Line Driver has a V.35
port (configured as DCE) that
connects to a host computer or
terminal (DTE), and a 4-screw
terminal block for RS-485
communication over 2- or
4-wire cable.

The Line Driver works in point-to-point or multipoint
synchronous applications over two- or four-wire twisted-pair
cable.

Short-haul sync data
communication over
your own twisted-pair
cable is a breeze with
the V.35 Synchronous
Multipoint Line
Driver.

Typical Application

The Line Driver operates in
two- or four-wire half-duplex
mode, or four-wire full-duplex
mode. Baud rates are switch­selectable, and range from
2400 to 256,000 bps.

LEDs on the Line Driver’s
front panel indicate flow
control (TX, RX, RTS, and CD)
and status (TD, RD, PWR).
And three pushbuttons (TST,
LLB, DLB) on the front panel
select line and digital loopback
tests.

Simply set the internal
switches or jumpers to
determine these
characteristics:

• Speed

Key Features

• Carrier: constant or
switched

• Operation: full- or half­duplex

• TX data clock select

• Node termination

The Line Driver package

includes:

• Line Driver (standalone
with power supply or card
version)

• DB25 to V.35 Adapter

• User’s Manual

V.35 Synchronous Multiport Line Driver

MP485/35

RTS CD TD RD PWR

DLB LLB TEST

• Multifunction Rack (16­Card)

• V.35 Interface Cable

• Unshielded Twisted-Pair
Cable

T

he Line Driver has

diagnostic LEDs,
pushbuttons, and DIP
switches for easy operation.

• The front panel has LEDs

for TD, RD, RTS, CD, and
PWR.

• The front panel has

pushbuttons for TST, LLB,
and DLB.

• The printed circuit board

has DIP switch banks S4,
S5, S6, and S7 to set baud
rate, transmit data clock,

and node termination.
The ten available speeds

are: 2.4, 4.8, 9.6, 19.2, 38.4,
56, 64, 112, 128, and 256
Kbps.

Choose from three transmit
data clock settings: Internal
Clock (factory setting),
Recovered Clock, and
External Clock.

Select node termination on
or off. The default setting is
TERM on.

Specifications

Speed—1.2, 2.4, 4.8, 9.6, 19.2,

38.4, 56, 64, 112, 128, or 256
Kbps

Interface—Terminal: V.35

DCE, Line: EIA RS-485
twisted pair (26 AWG
minimum), DC continuity
required

Pins Supported—V.35: CTS,

DCD, DSR, ETCA, ETCB,
FG, RCA, RCB, RDA, RDB,
SG, TCA, TCB, TDA, TDB;
Terminal Block: RXA, RXB,
TXA, TXB

Range—1 mile at 56/64 Kbps

on 24 AWG unshielded
twisted-pair

Connectors—(1) DB25

female, (1) screw-terminal
block; 6-inch (15.2-cm)
DB25 male to 34-pin M­block V.35 adapter
included

Operation—Point-to-point

or multipoint

Additional equipment you may need:

Technically Speaking

Ordering Information

This information will help you place your order quickly.

PRODUCT NAME ORDER CODE

V.35 Synchronous Multipoint Line Driver (MP485/35)

Standalone, 115 VAC...............................................ME521A

Standalone, 230 VAC.............................................ME521AE

Rackmount Card ......................................................ME521C

Multifunction Rack (16-Card).........................................RM005

V.35 Interface Cable...............................................EYN450-0010

The diagram at right shows a
multipoint application over 2­or 4-wire twisted-pair cable.

Mode—2-wire half-duplex, 4-

wire full- or half-duplex

Clocking—Internal, external,

or recovered

Carrier—Constant or

switched

Loopback—None, line, or

digital

RTS/CTS Delay—0, 11, 50, or

160 ms

Indicators—5 LEDs: TX, RX,

RTS, CD, and PWR
Diagnostics—DLB, LLB
Power—Wallmount

transformer: 115 VAC, 90

mA or 230 VAC, 45 mA
Size—Standalone: 1.8”H x

5.5”W x 8.5”D (4.5 x 13.9 x

21.5 cm); Rackmount Card:

4.7”W x 7.4”D (11.9 x 18.8

cm)
Weight—Standalone: 1 lb. (0.5

kg); Standalone unit and

transformer: 1.5 lb. (0.7 kg);

Rackmount card: 0.5 lb. (0.2

kg)

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