2009/09/29

Minnetonka, Minn. September 29 -- /Market Wire/ -- Transition Networks Inc., the switching and conversion technology expert, a wholly owned subsidiary of Communications Systems, Inc. (NASDAQ:JCS), today announced the introduction of its new HP compatible, C version, Small Form Pluggable (SFP) transceivers. The transceivers are designed for bi-directional optical data communication with support for 802.3z Gigabit Ethernet and Gigabit Fiber Channel applications at speeds up to 1.25 Gbps. With this announcement, Transition Networks rounds out its series of SFP optical transceivers.

The 1000Base-SX transceiver transmits on 850nm multimode fiber and the 1000Base-LX/LH transceivers transmit on single mode fiber up to 80km. The newly released HP compatible SFP is fully compatible with original HP SFPs and can be used in any SFP module on HP ProCurve switches that support original HP SFPs. In addition, the transceiver can be used in any industry standard networking equipment which complies with Multi-Sourcing Agreement.

"We provide customers with a complete line of affordable, Gigabit HP compatible SFP optical transceivers," says Patrick Schaber, Director of Marketing at Transition Networks. "The addition of the HP compatible, C version Small Form Pluggable transceivers enables our customers to fully leverage the potential of HP switches throughout their network without breaking the budget."

Product Availability and Configuration
Transition's new HP compatible SFP line is available immediately in the following configurations:

Part Number	Description
TN-J4858C	SFP, LC, Gigabit Ethernet 1000Base-SX, multimode, up to 550m on 50/125µm, up to 220 on 62.5/125µm multimode fiber
TN-J4859C	SFP, LC, Gigabit Ethernet 1000Base-LX, single mode, up to 20km
TN-J4860C	SFP, LC, Gigabit Ethernet 1000Base-LH, single mode, up to 80km

Please contact Transition Networks at (800) 526-9267 or visit www.transition.com 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 Networks brand of media converters and switches carry a lifetime warranty.

About Transition Networks Inc.
Transition Networks Inc. offers networking connectivity solutions that make networks perform better, faster and more reliably while helping companies leverage their existing networking infrastructure. The company's Transition Networks brand of media converters make conversion between disparate media types possible, providing conversion technology solutions that offer the necessary adaptations without affecting the performance, nature or appearance of the network. Its complete MILAN portfolio of multilayer switching products is designed to facilitate low-cost network evolution with unique solutions, easing the stress on networks caused by high-bandwidth applications. 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 (NASDAQ:JCS).

Statements regarding the Company's anticipated performance in 2009 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.

Company Contact:
Patrick Schaber
Transition Networks
(952) 996-1526

Editorial Contact:
Kim Miller
Tier One Partners
(617) 610-0583

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