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COMPUTER NETWORK TECHNOLOGY ANNOUNCES DATA TUNNELING SOFTWARE FOR CHANNELink

 MINNEAPOLIS, May 10 /PRNewswire/ -- Computer Network Technology Corporation (NASDAQ: CMNT) (CNT) today announced a new data tunneling capability for their channel networking systems that enables companies to send data from a variety of communications devices, including bridges, routers and front end processors, over the CNT network at better performance and less cost than existing connections.
 Data tunneling, also called encapsulation, interleaves data from external sources on the same network, bandwith used with channel networking applications like tape vaulting or extended channel attached peripherals. The data comes into the CNT system from either V.35 ports clocked up to 4 Mbps or High Speed Serial Interface (HSSI) connections at speeds up to 52 Mbps. Companies can adjust the network priority for traffic from the channel interfaces and tunneled devices to guarantee a service level for channel devices, with the flexibility for the tunneled traffic to dynamically use the full bandwith during non-peak periods. CNT's channel networking systems provide alternate path routing, load leveling over multiple circuits and data compression to the tunneled data.
 Early users of the feature have expressed positive feedback on its functionality. Neil Wehrspann, Network Performance Analyst for Deere & Company (Moline, Ill.) said Deere & Company is using V.35 tunneling in their CHANNELink network that connects their Moline data center with a remote site in Waterloo, Iowa. Said Wehrspann, "The CHANNELink tunneling feature allowed us to consolidate our router network with the CHANNELink network, producing a savings of about $2,000 per month. At the same time, the CHANNELink ability to effectively use wide-area bandwith produced an improvement in throughput by about 60 percent over the throughput we experienced with a separate wide-area link."
 Jim Morin, manager of Systems Marketing for CNT, added that data tunneling is possible in point-to-point or fully networked configurations. Morin said, "Data tunneling offers companies the ability to use a single set of circuits to carry their wide-area router traffic and their channel networking traffic. Multiple site connectivity is provided by routing Frame Relay data packets."
 CNT will use the Frame Relay Data Link Connection Identifier (DLCI) addresses and other header information to recognize the packet's destination router on the other side of the CNT network. CNT can also multiplex data from multiple origins over single or multiple links. In effect, CNT appears as a permanent virtual circuit to multiple locations. For example, a router with a Frame Relay interface will transmit its data through the CHANNELink network as if it were an actual Frame Relay service from a line carrier or other Frame Relay service provider.
 The data tunneling feature is immediately available on CNT's V.35 and HSSI interfaces at no additional charge.
 Computer Network Technology Corporation, a leader in the channel networking industry, develops and markets CHANNELink channel networking systems. These systems serve the data networking needs of many of the world's largest corporations by connecting high-performance computers, peripherals and local area networks in enterprise-wide backbone networks. The company's stock is traded on the NASDAQ Stock Market under the symbol CMNT.
 -0- 5/10/93
 /CONTACT: Doug Anderson of Computer Network Technology, 612-550-8000/
 (CMNT)


CO: Computer Network Technology ST: Minnesota IN: CPR SU: PDT

MA -- MN003 -- 6446 05/10/93 11:22 EDT
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Date:May 10, 1993
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