Black Box ME795A, ME796A, ME795A-M-RJ11-R2, ME795A-F-RJ11-R2, ME796A-M-RJ45-R2 Specifications

1

Asynchronous, full or
half-duplex operation.

Provides transformer
isolation and surge
protection.

Data rates up to

19.2 kbps.

Use in point-to-point
or multipoint
environments.

Transmission range up
to 2.2 miles (3.5 km).

Select DTE, DCE, or
printer support mode.

No AC power required.

RJ-11 models have an
LED indicator for
carrier detection.

U

se the Miniature Short-Haul

Modem NPR for connecting full
or half-duplex asynchronous
DTEs to DTEs operating over
unconditioned 4-wire lines. This
short-haul modem ensures
integrity of data transmission for
distances up to 2.2 miles (3.5 km),
depending on wire gauge and
data rate. (Reach 2.2 miles
[3.5 km] at 9600 bps or 1 mile
[1.6 km] at 19.2 kbps—in both
cases, over 24 AWG wire.)

What makes these modems
stand apart from the crowd is that
they offer surge protection and
transformer isolation. Surge
protection guards your equipment

RCV

XMT

G

This tiny modem plugs directly

into an async DTE’s DB25 port.

Key Features

MINIATURE SHORT-HAUL MODEM NPR

from damage caused by surges,
brownouts, or spikes in electricity.
Isolation transformers protect
against AC or DC overvoltages.

The modems also have an
internal filter that provides high
noise immunity by reducing
radiated and conducted
interference.

You can even connect DCEs
or printers to the modem. The
modem has a 3-position slide
switch that selects DTE, DCE, or
printer support mode.

The modem requires no
external power since it uses
power from the interface’s data
and control signals.

Clear, crisp, communication is

provided, with minimal crosstalk.

Models are available with
RJ-11 or RJ-45 connectors and
DB25 male or female connectors.
Plus, all models also have a
5-screw terminal block connec­tor. The RJ-11 models have an
LED that indicates Carrier Detect
(CD).

Two point-to-point applica­tions are common: PC to PC and
PC to printer. Or, create a multi­point configuration to connect
one computer to a several PCs
(see the diagram on the next
page). You’ll need one modem for
each attached device.

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

© 2005. All rights reserved.

Black Box Corporation.

7/26/2005 #20974

2

Distance (Maximum): 2.2 mi.

(3.5 km) at 9600 bps over 24 AWG
wire; 1 mi. (1.6 km) at 19.2 kbps
over 24 AWG wire

Operation: 4-wire half- and full

duplex

Protocol: Asynchronous

Transmission Controls: DSR (Circuit

107), turns on immediately after
DTE raises DTR (Circuit 108); DCD
turns on after recognizing the
receive signal from the line;
CTS (Circuit 106) turns on
40 msec after DTE raises RTS
(Circuit 105)

Transmission Level: 0 dBm

Compliance: EN 55022 (1987),

EN 50082-1 (1992)

User Controls: (1) 3-position slide

switch (DTE, DCE, Printer
support)

Interface: RS-232 (DTE or DCE)

Connectors: ME795A-M-RJ11-R2:

(1) DB25 male, (1) RJ-11,
(1) 5-screw terminal block;

ME795A-F-RJ11-R2: (1) DB25

female, (1) RJ-11, (1) 5-screw
terminal block;

ME796A-M-RJ45-R2: (1) DB25

male, (1) RJ-45, (1) 5-screw
terminal block;

Connectors (continued):

ME796A-F-RJ45-R2: (1) DB25

female, (1) RJ-45, (1) 5-screw
terminal block

Indicators: ME795A-M-RJ11-R2,

ME795A-F-RJ11-R2: (1) LED for

Carrier Detect (CD)

Temperature Tolerance: Operating:

32 to 122°F (0 to 50°C)

Humidity Tolerance: Up to 90%,

noncondensing

Power: 6 VDC from the RS-232

interface;
DTE mode: Pins 3, 6, or 8;
DCE mode: Pins 2, 4, or 20

Size: 0.7"H x 2.1"W x 2.6"D

(1.8 x 5.3 x 6.6 cm)

Weight: 0.9 oz. (25.5 g)

Async

computer

Async

terminals

Miniature Short-Haul Modem

NPR (ME796A-F-RJ45-R2)

Miniature SHM NPR
(ME796A-F-RJ45-R2)

GigaBase

®

350 CAT5e,

350-MHz Bulk Cable

(EYN851A-1100)

Specifications

Ordering Information

ITEM CODE

Miniature Short-Haul Modem NPR

RJ-11/

DB25 Male.....................................ME795A-M-RJ11-R2

DB25 Female...................................ME795A-F-RJ11-R2

RJ-45/

DB25 Male.....................................ME796A-M-RJ45-R2

DB25 Female...................................ME796A-F-RJ45-R2

Y

ou might also need to order cable…

RJ-11 Modular Cable (4-Wire).......................EL04MS-MM

RJ-45 Modular Cable (8-Wire).......................EL08MS-MM

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

1100-ft. (335.2-m) Boxed Reel, Blue........EYN851A-1100

Link several PCs to an async host
with this multipoint configuration.

TX

TX

TX

TX

RX

RX

RX

RX