Black Box TL421A User manual

BL A C K B O X®

Split data from a single modem to four RS-232

DTEs.

Passive, non-powered. Operates transparent to data formats and speeds.

4-Port RJ-45 Modem Splitter (RS-232 on RJ-45)

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)

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

724-746-0746 • Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence,

PA 15055-1018 • Web site: www.blackbox.com • E-mail: info@blackbox.com

Customer

Support

Information

TL421A

Page 2 724-746-5500 | blackbox.com

4-Port RJ-45 Modem Splitter (RS-232 on RJ-45)

1. Specifications

Leads Supported — Pins 3, 4, 5, 7, and 8 connected straight through between the

Master and Ports1–4;

Pins 1, 2, and 6 “diode OR’ed” from Ports 1–4 to the Master port

Connectors — (1) single style RJ-45 socket connector (Master);

(1) quad-style RJ-45 connector (Ports 1–4)

Power — Non-powered; no power supply required

Size — 1"H x 2.3"W x 4.3"D (2.5 x 5.7 x 10.8 cm)

Weight — 0.25 lb. (0.11 kg)

2. Introduction

The 4-Port RJ-45 Modem Splitter (TL421A) is designed to allow multiple terminals to

share a single modem. This passive device is non-powered and transparent to data

formats, rates, and protocols. Data received from the modem is transmitted to all

attached terminal devices. Only one terminal device may send data to the modem at

a time. If more than one terminal device sends data at the same time, the data will

be corrupted. Connect the Master port to a DCE device, such as a modem, using an

RJ-45 straight-through cable and the appropriate RJ/DB adapter. All other ports,

labeled Port 1 through Port 4, connect to DTE terminal devices. When connected to

DTE devices, you don’t need crossover cables.

Page 3

724-746-5500 | blackbox.com

4-Port RJ-45 Modem Splitter (RS-232 on RJ-45)

3. Installation

There are no user-configurable settings in the 4-Port RJ-45 Modem Splitter. Simply

connect your modem or other DCE device to the Master port, and connect your

terminals or other DTE devices to Ports 1–4 on the Modem Splitter. For the GND

signal and any signals that flow from the DCE to DTE direction, use Pins 3, 4, 5, 7,

and 8. For signals that flow from the DTE to DCE direction, use Pins 1, 2, and 6. A

typical configuration would be to connect RTS, DTR, and TD to Pins 1, 2, and 6

respectively, and to connect RD, GND, RI, DCD, and CTS to Pins 3, 4, 5, 7, and 8.

Once all the connections have been made, power up your modem and terminals as

normal. The system is now ready for operation.

BL A C K B OX®

Black Box Tech Support: FREE! Live. 24/7.

Tech support the

way it should be.

Great tech support is just 30 seconds away at

724-746-5500 or blackbox.com.

724-746-5500 | blackbox.com

TL421A, version 2

About Black Box

Black Box provides an extensive range of networking and infrastructure products.

You’ll find everything from cabinets and racks and power and surge protection

products to media converters and Ethernet switches all supported by free, live 24/7

Tech support available in 30 seconds or less.

© Copyright 2011. Black Box Corporation. All rights reserved. Black Box®and the Double Diamond logo

are registered trademarks of BB Technologies, Inc. Any third-party trademarks appearing in this white paper

are acknowledged to be the property of their respective owners.

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