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High-Density Media Converter System II T1/E1/J1 to Duplex Fiber Module, Twisted Pair (RJ-48) to Multimode, 1300-nm, 2 km, ST


Limited Quantity In Stock
Same Day Shipping (before 5PM ET)
Extended Double Diamond™ Warranty Available (3 Additional Year)

*Required field


These Physical Layer modules for the High-Density Media Converter System II belong to a large family of modular media converter and communications options for your managed enterprise network. With many modules to choose from, this system can adapt to even the most demanding network configurations.

They convert the incoming electrical signal from one cable type and then transmit it over another type. The media converters are totally transparent to network operation, having no effect on the data being sent across the link. What's more, all of the modules are hot-swappable—you never need to power down a chassis to change a module.

The High-Density Media Converter System II T1/E1/J1 to Duplex Fiber Modules featured here enable you to extend 1.544-Mbps T1/J1 or 2.048-Mbps E1 copper-based circuits over multimode or single-mode fiber optic cable. They're ideal for use with PBX systems or legacy telco circuits.

These modules are selectable to support 1.544-Mbps T1 (ANSI T1.403), 2.048-Mbps E1 (G.703), or 1.544-Mbps J1. Offering protocol-selectable operation, the converters enable you to easily choose between T1/J1 and E1 rates via DIP switches on their boards. Built-in jitter removal ensures maximum throughput.

The modules also feature full diagnostics, including three modes of operation for loopback testing (Fiber Analog Loopback, Fiber Digital Loopback, and Twisted-Pair Digital Loopback), a line integrity test feature, and a Transmit Data Source diagnostic feature. Manage the modules through an optional SNMP Management Module (LMC5200A) plugged into the High-Density Media Converter System II Chassis.

In addition, an MDI/MDI-X switch on the modules configures the RJ-48 port for crossover or straight-through cable connection automatically.

Tech Specs

CE Approval Yes
Connectors T1/E1/J1: (1) RJ-48; Fiber optic: (1) pair of ST®, SC, or MT-RJ
Encoding AMI, B8ZS, HDB3
Fiber Type 50/125-µm or 62.5/125-µm multimode; or 9/125-µm single-mode
Power From the High-Density Media Conversion System II Chassis
Speed T1, J1: 1.544 Mbps; E1: 2.048 Mbps
This product works with:
These products work with High-Density Media Converter System II Chassis

* Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 877-877-2269.



Double Diamond Warranty

Extended 1 Year Warranty Available

Protect your purchase with an additional 1 Year Double Diamond™ warranty!
Cost: $53.36

Extended 3 Year Warranty Available

Protect your purchase with an additional 3 Year Double Diamond™ warranty!
Cost: $106.72


Double Diamond™ Warranty (Standard)

Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

The High-Density Media Converter System II T1/E1/J1 to Duplex Fiber Module, Twisted Pair (RJ-48) to Multimode, 1300-nm, 2 km, ST comes with a standard 6 Year Double Diamond™ Warranty (Standard) already included.

During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

Plus, get an Extended Double Diamond Warranty.

You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

* Warranty subject to certain exclusions and limitations ** Certain products may not be eligible.

What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.