HomeIndexesBlack BoxTL073A-R4

Black Box 3-Port Modem Splitters (MS-3)

Black Box TL073A-R4

Click image to enlarge or see more views.

Manufacturer Part#  TL073A-R4

UPC Code: 822088066583

Provantage Code:  BBOX1TV

Condition:  Factory New

  • Product Type: Signal Splitter
  • Limited Warranty: 1 Year
  • TAA Compliant: Yes

TAA CompliantSatisfaction Guaranteed

NetworkingModemsVarious Modems and Accessories

Black Box TL073A-R4 Specifications

    3-Port Modem Splitters (MS-3)


    Product features:
    • Both models include DB25 extension cable and a serial AT adapter.
    • Modem sharing for three to six users.
    • Perfect for workgroups that need limited data communications or only connect to the Internet occasionally.
    • Inexpensive, nonpowered, easy to use.
    • Use with sync or async devices.

At a Glance

    • MASTER port is configured DTE and PORTS 1-3 are configured DCE
    • Signals present on the MASTER connector at pins 1, 3, 5, 6, 7, 8, 15, and 17 are sent to the corresponding pins on each of the PORT connectors.
    • Signals present on the PORT connectors at pins 2, 4, and 20 are passively stored and sent to the corresponding pins on the MASTER connector.
    • The total combined length of all cables connected to the unit should be less than 50 feet (15.2 m).
    • Data coming into the MASTER port on pin 3 of the RS232 DB25 Passive Splitter goes to all three Slave ports since they are all tied common.
    • Only one SLAVE port may transmit data to the MASTER port at any one time, Pin 2 on the three SLAVE ports are not tied in common and are isolated from each other by an OR gate.


    Use our Modem Splitter to connect three terminals to one modem and save money - you won't need extra modems and extra lines!

    No special cables are needed. It uses ordinary straight-pinned cables for a hookup, and includes a 6-ft. DB25 male/DB25 female extension cable and a serial DB9 female/DB25 male AT adapter.

    The Modem Splitter is transparent to speed and protocol and works equally well in sync and async environments.

    The TL073A-R4 includes (1) modem splitter, (1) 6-ft. DB25 male/DB25 female extension cable, and (1) serial DB9 female/DB25 male AT adapter.

    A 6-Port Modem Splitter is also available. See "Similar Products."

Environmental Certification



Package Contents

    • RS232 Passive Splitter - DB25, 3-Port
    • 1 x 6-ft. DB25 Male/DB25 female Extension Cable
    • 1 x Serial DB9 Female/DB25 male AT Adapter


Product Name3-Port Modem Splitters (MS-3)
Manufacturer Part NumberTL073A-R4
Product TypeSignal Splitter
TAA CompliantYes
Environmentally FriendlyYes
Country of OriginTaiwan
Packaged Quantity1
Limited Warranty1 Year
Considering a Volume Purchase?

Shop with confidence! Provantage is an authorized Black Box dealer.

Visit the Manufacturer
Learn more by visiting the manufacturer's website.

Black Box
© Copyright 1984-2022 Provantage
Black Box TL073A-R4