Skip to main content

Black Box 4-Port Modem Splitter

Part #: 1-1370673

Black Box 4-Port Modem Splitter

Part #: 1-1370673 MFG Part #: TL421A UPC #: 822088119302
$113.64 $73.87
Save $39.77
LIMITED STOCK

17 Available

(as of Jul 22, 2026 9:47 AM) Refresh Inventory
FREE SHIPPING ON ORDERS OVER $100

Order within
for shipment today

AUTHORIZED DEALER
AUTHORIZED DEALER
AUTHORIZED DEALER

AUTHORIZED DEALER

Protect your investment ()

About the Black Box TL421A

View User Manual
Featuring multiple ports for splitting modem signals, the compact 4-Port Modem Splitter (RS-232 on RJ-45) makes it easy and affordable for four terminals to share a single modem.

With it, you can avoid the cost of having to purchase and install multiple modems and multiple modem lines.

Plus, it's easy to set up and use. There are no user-configurable switches, jumpers, or settings on the modem splitter. Simply connect the modem and terminal (DTE) devices to it, then power up your modem and terminals as normal.

The splitter's master port connects to your modem using an RJ-45 straight-through cable and the appropriate RJ or DB adapter. Its other ports (Port 1 through Port 4) connect to your DTE terminal devices.

NOTE: Only one terminal device can send data to the modem at a time.Featuring multiple ports for splitting modem signals, the compact 4-Port Modem Splitter (RS-232 on RJ-45) makes it easy and affordable for four terminals to share a single modem.

With it, you can avoid the cost of having to purchase and install multiple modems and multiple modem lines.

Plus, it's easy to set up and use. There are no user-configurable switches, jumpers, or settings on the modem splitter. Simply connect the modem and terminal (DTE) devices to it, then power up your modem and terminals as normal.

The splitter's master port connects to your modem using an RJ-45 straight-through cable and the appropriate RJ or DB adapter. Its other ports (Port 1 through Port 4) connect to your DTE terminal devices.

NOTE: Only one terminal device can send data to the modem at a time.

Technical Specifications of the Black Box TL421A

General Information


Manufacturer Black Box Corporation
Manufacturer Part Number TL421A
Manufacturer Website Address http://www.blackbox.com
Brand Name Black Box
Product Model TL421A
Product Name 4-Port Modem Splitter
Packaged Quantity 1
Product Type Signal Splitter

Interfaces/Ports


Network (RJ-45) Yes
Number of Network (RJ-45) Ports 5

Physical Characteristics


Height 1"
Width 2.2"
Depth 4.3"
Weight (Approximate) 4 oz

Miscellaneous


Green Compliant Yes
Country of Origin United States

Warranty


Limited Warranty 1 Year

Ratings and Reviews

Do you own the Black Box TL421A?
Be the first to write a review!
Displaying 1-10 of 70
Page size: