06.06.05

Editorial Contact: Kim Miller
KLM Public Relations Inc.
(617) 610-0583
klmcomm@hotmail.com

Transition Networks Offers Optical Line Converters

Minneapolis, MN - June 6, 2005 - Transition Networks Inc., the conversion technology expert, a wholly owned subsidiary of Communications Systems, Inc., today announced the introduction of a new Optical Line Converter. The converter offers protocol independent connectivity between fiber optical or copper links with an added flexibility of Small Form Factor Pluggable (SFP) technology. STSFP4040-100 is a universal platform to accommodate any optical and electrical conversion protocol options available via SFP interfaces.

Two SFP module slots allow for seamless connectivity between different wavelengths or fiber modes for speeds up to 2Gbps. Protocol independence allows for use in broad range of applications including Fast Ethernet and Gigabit Ethernet, FDDI, ESCON, SONET OC-3, OC-12, OC-48 and Fibre Channel.

“These converters offer an excellent upgrade path for the networks,” said Bill Schultz, vice president of marketing for Transition Networks. “Today's Fast Ethernet applications can be upgraded to Gigabit speeds tomorrow with a simple SFP swap. The converter remains installed, managed and fully operational at any of these speeds.”

Different fiber types, wavelengths or copper interfaces can now be connected using this Line Converter. When used with an SX and LX module the unit can be used as a mode converter. If used with a 1000Base-T SFP and a 1000Base-SX or LX SFP the unit can make a copper to fiber conversion. "Convenience and flexibility are the big benefits of this new product. Fast Ethernet optical conversion with an easy upgrade path to Gigabit is very appealing to our customers” said Bill Schultz VP of marketing.

The converter is vendor agnostic and it accepts all standard SFP modules.

Product Features
Product features include Two SFP Slots for SFP interfaces. Link Pass Through offers a link failure notification capability. Users can also control the device using an SNMP Management via Free of charge GUI Interface, WEB Browser, telnet or Command Line Interface. Optical power and link budgets can also be measured thanks to an optional Digital diagnostics capability.

Product Configuration
Transition’s Optical Line Converters are available in two versions. Standalone STSFP4040-100 and The Point System™ chassis card CTSFP4040-100 to fit any CPSMCxxxx chassis cabinets.

Product Availability
The converter is available now. Please contact Transition Networks at (800) 526-9267 for the latest information.

About Transition Networks Products
Transition Networks' conversion products are known for their ruggedness and reliability. They have a 99.4 percent customer acceptance rating, meaning that approximately one in 1,000 experience failure in the field. All Transition products carry a lifetime warranty.

About Transition Networks Inc.
Transition Networks Inc. offers networking connectivity solutions that make the conversion between disparate media types possible. The company designs and markets these media conversion technologies across a broad spectrum of networking protocols including Ethernet, Fast Ethernet, ATM, Gigabit Ethernet, T1/E1, DS3, and more. The company works alongside leading networking vendors — Nortel Networks, Hewlett Packard, 3COM, Cisco, Enterasys, Extreme, Foundry, Avaya and others — to provide conversion technology solutions that offer the necessary adaptations without affecting the performance, nature or appearance of the network to the users or the network devices. Based in Minneapolis, Transition Networks distributes hardware-based connectivity solutions exclusively through a network of resellers in 50 countries, including Ingram Micro and Tech Data. Transition Networks is a wholly owned subsidiary of Communications Systems, Inc., a publicly traded company (AMEX: JCS).

Statements regarding the Company's anticipated performance in 2005 are forward-looking and involve risks and uncertainties, including but not limited to: competitive products and other factors discussed from time to time in the Company's filings with the Securities and Exchange Commission.