MINNEAPOLIS, MN–( EMWNews – April 1, 2008) – Transition Networks Inc., the switching and

conversion technology expert, a wholly owned subsidiary of Communications

Systems, Inc. (AMEX: JCS), today announced the introduction of three new

industrial-hardened devices designed to increase the density, speed and

functionality of hazardous location Ethernet networking. The addition of a

Gigabit Ethernet media converter, a 4-port Power over Ethernet (PoE) switch

and a 16-port Fast Ethernet switch with two gigabit SFP combo ports to

Transition’s already vast industrial portfolio further enables customers

the utmost in flexibility when extending their Ethernet connectivity beyond

the controlled, office environment. All models are unmanaged, ruggedized

devices designed to reliably operate in harsh networking environments found

on factory floors, outdoor enclosures or other hazardous environments and

are backed by an unsurpassed lifetime warranty.

“Linking remote IP security cameras and Wi-Fi access points can be a real

challenge considering the 100 meter distance limitation of PoE over UTP

cabling. And, installing these devices in hazardous locations previously

required separate, external power supplies. Our industrial hardened PoE

switch now brings all the benefits of PoE to those outdoor or factory floor

locations,” said Patrick Schaber, Director of Marketing at Transition

Networks. “The addition of Gigabit Ethernet capability, as well as

increased port density on our industrial-grade media converters and

switches, enables us to offer our customers increased flexibility in

solving their end-to-end networking challenges.”

Gigabit Ethernet Industrial Media Converter

The SISTG10xx-111-LR(T) is a ruggedized, unmanaged Gigabit Ethernet media

converter designed to allow low-speed or legacy copper-based devices to be

bridged onto a Gigabit Ethernet fiber backbone. It has 1 x

10/100/1000Base-T port and 1 x 1000Base-X fiber port, offered with either

fixed optics or a Gigabit SFP slot. The RJ-45 port supports

Auto-negotiation and AutoCross™ (auto MDI/MDI-X) and the media converter

offers Link Pass Through, which provides the ability to “pass through” the

loss of RX signal on one of the media ports to the TX signal of the other

media port.

Offered in both a standard operating temperature range of -10°C to +50°C or

extended operating temperature range of -40°C to +65°C, this switch also

provides dual, redundant, auto-sensing 12-48VDC power inputs with reverse

polarity power input protection and overload current protection as well as

a relay contact output circuit for controlling external alarms. DIN-rail

and wall mount brackets are included as standard.

4-port Industrial PoE switch with Fiber

The SISTP10xx-141-LR(T) is a ruggedized, unmanaged Fast Ethernet switch

with PoE that is designed to provide fiber connectivity with the additional

capability of powering wireless access points, voice over IP phones and IP

security and surveillance cameras that may be located in remote, outdoor or

factory floor locations. It has 4 x 10/100Base-TX ports plus

1 x 100Base-FX fiber port. All of the RJ-45 ports support Auto-negotiation

and AutoCross™ (auto MDI/MDI-X) as well as the IEEE 802.3af standard for

Power over Ethernet providing a full 15.4 watts of power to up to four

powered devices (PD).

Offered in both a standard operating temperature range of -10°C to +50°C or

extended operating temperature range of -40°C to +65°C, this switch also

provides dual, redundant, auto-sensing 48VDC power inputs with reverse

polarity power input protection and overload current protection as well as

a relay contact output circuit for controlling external alarms. DIN-rail

and wall mount brackets are included as standard.

16 + 2 port Industrial Ethernet Switch

The SISTF1040-162D-LR(T) is a ruggedized, unmanaged Fast Ethernet switch

that is designed for compact, high-density Ethernet connectivity. It has

16 x 10/100Base-TX ports plus 2 x 10/100/1000Base-T RJ-45 or 100/1000Base-X

SFP combo ports. All of the RJ-45 ports support Auto-negotiation and

AutoCross™ (auto MDI/MDI-X) and all SFP ports support both 100Base-FX

and 1000Base-X SFP optics.

Offered in both a standard operating temperature range of 0°C to +60°C or

extended operating temperature range of -40°C to +75°C, this switch also

provides dual, redundant, auto-sensing 12-48VDC power inputs with reverse

polarity power input protection and overload current protection as well as

a relay contact output circuit for controlling external alarms. DIN-rail

and wall mount brackets are included as standard.

Product Availability and Configuration

Transition’s new industrial-hardened media converters and switches are

available immediately and in the following configurations:

Product                Description

SISTG1013-111-LR(T)    Unmanaged Industrial Media Converter, (1)

                       10/100/1000Base-T to (1) 1000Base-SX,

                       multimode SC, 220m/550m

SISTG1014-111-LR(T)    Unmanaged Industrial Media Converter, (1)

                       10/100/1000Base-T to (1) 1000Base-LX, single

                       mode SC, 10km

SISTG1040-111-LR(T)    Unmanaged Industrial Media Converter, (1)

                       10/100/1000Base-T to (1) 1000Base-X, SFP slot

                       (empty)

SISTP1011-141-LR(T)    Unmanaged Industrial PoE Switch, (4) 10/100Base-TX +

                       (1) 100Base-FX, multimode ST, 2km

SISTP1013-141-LR(T)    Unmanaged Industrial PoE Switch, (4) 10/100Base-TX +

                       (1) 100Base-FX, multimode SC, 2km

SISTP1014-141-LR(T)    Unmanaged Industrial PoE Switch, (4) 10/100Base-TX +

                       (1) 100Base-FX, single mode SC, 20km

SISTF1040-162D-LR(T)   Unmanaged Industrial Switch, (16) 10/100Base-TX +

                       (2) Combo ports - 10/100/1000Base-T or

                       100/1000Base-X SFP

Please contact Transition Networks at (800) 526-9267or 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 (AMEX: JCS).

Statements regarding the Company’s anticipated performance in 2008 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