First European Showing For Transition Networks’ Advanced Next Gen Devices

Comprehensive Product Portfolio on Display at Broadband World Forum

Paris, France – September 27, 2011 – Fiber access technology specialist Transition Networks, a wholly owned subsidiary of Communications Systems, Inc. (NASDAQ: JCS), is showcasing three of its advanced next generation products for the first time in Europe at the Broadband World Forum in Paris this week from 27 to 29 September. The 10 Gigabit Ethernet fiber-to-fiber media converter, the S3240 Network Interface Device (NID) and the PacketBand-TDM-4/3MC TDM-over packet device are among the highlights of one of Transition Networks’ most comprehensive trade fair exhibits to date. The extended portfolio on display is a reflection of the company’s commitment to expanding its European operations.

10 Gigabit technology supports multiple standards, such as varied transmission distances on different types of fiber. With Transition’s 10 Gigabit media converter, users can select the fiber module needed to support their specific transmission distance requirements. Built for fiber extension over maximum transmission distances (80km/49.7miles), the 10 Gigabit media converter can also be used to interface between different types of fiber that may already be installed or available at a user’s location. For example, a conversion between single mode fiber to multimode fiber at 10G speeds can be used for expanding, extending and upgrading existing Ethernet networks in both telecom and enterprise applications where 10 Gigabit media conversion and fiber extension are required.

The S3240 NID is specifically designed to help telecoms and cable providers generate and preserve increased revenues when delivering intelligent Ethernet services. With the growing demand for Ethernet services, the new S3240 enables service providers to offer tiered services with end-to-end Service Level Agreements (SLAs), while increasing customer satisfaction and keeping capital expenses (CapEx) to a minimum. The S3240 creates a clear demarcation point between the provider and the customer network or in carrier-to-carrier handoffs.

The PacketBand-TDM-4 (TDM-4) device facilitates the transportation of legacy TDM traffic over IP and other packet networks. It delivers clock-locked clear channel or structured E1/T1 circuits over Ethernet, IP or MPLS networks, supports up to four E1/T1s, and can be used in pairs or with other members of the PacketBand range. The 3-port unit

(PacketBand-TDM-3MC) supports multicast and applications in larger networks where clocking is critical. It also has application in some vertical markets such as broadcasting. The PacketBand devices address difficult technical challenges, such as the provision of highly-accurate clocking and synchronization, necessary for applications such as mobile backhaul delivery via packet networks.

“The devices we are debuting at the Broadband World Forum address the needs of the growing number of European service providers building, expanding or migrating to next generation Ethernet or packet networks. Our comprehensive product portfolio is now being targeted at the telecom, cable and enterprise service provider market sectors across the region,”

commented Dirk Steinkampf, Director of EMEA Sales and Operations. “In line with this, we have a major presence at the Broadband World Forum and look forward to demonstrating our advanced capabilities to our customers, old and new.”

About Transition Networks Products

Transition Networks’ conversion products are known for their ruggedness and reliability. They have a 99.4 percent customer acceptance rating. 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. Transition Networks is a wholly owned subsidiary of Communications Systems, Inc., a publicly-traded company (NASDAQ-GM: JCS).