Black Box TCA-232 User manual

JULY 1997

MC124A

Tail-Circuit Adapter (TCA-232)

CUSTOMER SUPPORT INFORMATION

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX

FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

TCA-232

TRADEMARKS

All applied-for and registered trademarks are the

property of their respective owners.

TCA-232

CONTENTS

1. Specifications . . . . . . . . . . . . . . . . . . . . . . . .5

2. Introduction . . . . . . . . . . . . . . . . . . . . . . . .6

2.1 Description . . . . . . . . . . . . . . . . . . . . .6

2.2 Features . . . . . . . . . . . . . . . . . . . . . . . .6

3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . .7

4. Application . . . . . . . . . . . . . . . . . . . . . . . . .8

TCA-232

1. Specifications

Transmission Format — Synchronous, transparent

to protocol

Data Rate — Up to 256 Kbps

Tail-to-System Buffering — 16-bit buffer, automatic

centering

Connectors — (2) DB25 female

DCE to DTE Connection — The TCA-232 provides

cross-pinning function

Temperature — 32 to 140°F (0 to 60°C)

Humidity — Up to 95%, noncondensing

Power — No AC power required; uses ultra-low

power derived from the EIA RS-232C, CCITT V.24

data and clock signals

Size — 1.2"H x 2"W x 5.3"D (3 x 5 x 13.5 cm)

Weight — 0.22 lb. (0.1 kg)

TCA-232

2. Introduction

2.1 Description

The Tail-Circuit Adapter (TCA-232) has a 16-bit

buffer that helps you synchronize clock signals in

your tail circuit.

Data is transferred from the multiplexor directly

to the adjacent modem, using the mux receive clock

(pin 17), which is also provided to the modem

external clock (pin 24). Data received from the

remote terminal is loaded into the buffer using

the mux transmit clock (pin 15).

Since the TCA-232 performs all necessary cross

connections between the two DCEs, you only need

straight-through cables.

2.2 Features

• DCE to DCE connection

• Built-in buffer to prevent jitter errors

• Data rates up to 256 Kbps

• No strapping, easy to install

• No AC power required

• Compact and lightweight

TCA-232

3. Installation

1. Connect the side of the TCA-232 labeled

“SYSTEM, J1” to the multiplexor sub-channel

or the main modem.

2. Connect the side of the TCA-232 labeled

“TAIL, J2” to the local modem. The local

modem should be strapped to external clock.

NOTE

The remote modem on the tail circuit should be strapped for

CLOCK LOOPBACK.

TCA-232

4. Application

The TCA-232 is used to couple two DCE devices

together whose clocks are of the same frequency

but are not “in phase.”

An example is an extension of a multiplexor

channel using modems in a “tail circuit” (see

Figure 4-1). When the distance between the two

tail modems is significant, there is a difference in

phase between the multiplexor’s transmit clock

and the adjacent modem’s receive clock, resulting

in transmission errors. The TCA-232 acts as a buffer

between the DCEs to prevent these transmission

errors.

TCA-232

Figure 4-1. Typical Application.

Mux

TCA Terminal

Modem

(External

Clock)

Modem

(Clock

Loopback)

TCA-232

Figure 4-2. Schematic Diagram of Data Flow.

BUFFER

TCA

SYSTEM

TAIL

15 TC 15

2TD 2

4RTS 4

17 RC 17

3RD 3

8DCD 8

6DSR 6

20 DTR 20

5CTS 5

1PG 1

7SG 7

17 RC

3RD

8 DCD

15 TC

2TD

4 RTS

20 DTR

6 DSR

1PG

7SG

24 ECLK 24

5 CTS 5

EXTERNAL

CLOCK

DCD

MUX

DCE

MODEM

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746

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