Black Box TL305A User Manual download pdf (Page 2)

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)

Technically Speaking

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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