Black Box ME795A Manual de usuario

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.

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

This tiny modem plugs directly

into an async DTE’s DB25 port.

KeyFeatures

MINIATURESHORT-HAULMODEMNPR

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 connec-

tor. The RJ-11 models have an

LED that indicates Carrier Detect

(CD).

Two point-to-point applica-

tions are common: PC to PC and

PC to printer. Or, create a multi-

point 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: [email protected]

Black Box Corporation.

7/26/2005 #20974

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

You 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.

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