Black Box TL304A Manual de usuario

Reduces line costs.

Includes anti-

streaming capability.

Supports synchronous

or asynchronous

equipment.

Supports speeds up to

19.2 kbps.

Includes a built-in

buffer.

Features fle ible

contention methods.

Easy to install.

ith the Programmable Sharing

Device (PSD), you can

connect any combination of four

or eight terminals to one port on

your IBM®host and slash your

line costs. Or you can let four or

eight terminals share a modem, or

four or eight modems or terminals

share a mux. No matter what type

of combination you choose, you

save money.

An anti-streaming feature

reduces downtime, too. The PSD

senses data streaming and

automatically disables the faulty

channel. Now, you won’t have to

worry about leased-line noise

causing a constant transmission

that overloads all the channels

and stops data flow.

The PSD is transparent to any

system. It works with

synchronous or asynchronous

equipment at data rates of up to

19.2 kbps. It also generates

internal timing signals or gets its

Now one CPU port can handle

all your modems and terminals.

KeyFeatures

PSD-4ANDPSD-8

clocking externally from

subchannels. A 16-bit buffer

accommodates clocking

differences.

Lock out idle ports manually or

automatically. You can set the

PSD to disable an “active” port on

which no data has been sent for a

preset length of time anywhere

from 1.7 to 108 seconds. You can

also disable a port via a front-

panel switch.

Flexible contention methods

make the PSDs easy to use when

the usual signals aren’t available.

Choose RTS, DCD, or actual data

signals to control contention.

Best of all, installing the PSD

takes just minutes and requires

only a straight-through cable.

Crossover connections are done

inside the unit and are controlled

by a DTE/DCE switch. The PSD

also includes an LED that shows

automatic disabling.

Note: Asynchronous and

synchronous equipment cannot

be mixed on the same PSD.

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.

6/5/2003 #12269

• Don’t buy dedicated modems or muxes for infrequent users. Use

the PSD-4 and let up to four users share one modem or mux.

• Use the PSD-8 to connect multiple devices, such as modems and

controllers, to your AS/400®.

TypicalApplications

he PSD supports three clock modes: internal, external from the main

channel, or external from subchannel 1.

A built-in buffer compensates for phase differences between

modem clocks that are connected to the subchannels and the PSD’s

main-channel transmit clock. You can activate an extra buffer option on

the PSD-8 when it’s connected to equipment that cannot accept an

external clock, such as DDS (in the United States).

You can use side-panel brackets to install the PSD in a 19" rack. The

brackets can be removed without harming the PSD.

The PSD includes four LEDs. POWER lights when the device is

receiving AC power. DATA lights when data is broadcast from the main

channel to the subchannels. ACTIVITY lights when a subchannel

accesses the main channel. AUTOMATIC lights when a subchannel has

been automatically disabled.

Clock: Internal (self-generated) or

external (supplied by DTE or DCE)

Contention Type: Control (RTS or

DCD) or data signals

Operation: Synchronous or

asynchronous

Speed: Up to 19.2 kbps

User Channels: 4 or 8

Interface: RS-232/CCITT V.24

Connectors:

PSD-4: (5) DB25 female;

PSD-8: (9) DB25 female

Indicators: PSD-4: (1) ON/OFF,

(4) Channel Activity,

(4) Channel Disable;

(1) displays data broadcast

from main channel to

subchannels;

PSD-8: (1) ON/OFF,

(8) Channel Activity,

(8) Channel Disable;

(1) displays data broadcast

from main channel to

subchannels

Power: 115/230 VAC, 60/50 Hz,

10 watts (230-VAC model

available on request)

Size: PSD-4: 1.8"H x 14"W x 10.5"D

(4.6 x 35.6 x 26.7 cm);

PSD-8: 1.7"H x 17" x 8.2"D

(4.3 x 43.2 x 20.8 cm)

Weight: PSD-4: 5.5 lb. (2.5 kg);

PSD-8: 4.4 lb. (2 kg)

TechnicallySpeaking

Modem

Programmable

Sharing Device-4

To Telco

PCs

Specifications

Ordering Information

ITEM CODE

Programmable Sharing Device-4.............................TL304A

Programmable Sharing Device-8.............................TL305A

Save on equipment costs. Use the PSD-4 and let infrequent

users transmit and receive data via one modem.

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