New Technology is the Basis for New Product Line

TECMAR IMPROVES NETWORK BACKUP OPERATIONS WITH NEW CONCURRENT TRANSFER
TECHNOLOGY

SOLON, Ohio, June 29, 1993 -- Responding to the increasing amount of
valuable data generated by corporate America that needs to be backed up
efficiently and reliability, Tecmar has developed Concurrent Transfer (CX)
technology. CX technology, which allows the backup of up to eight clients
to one tape drive simultaneously, provides unparalleled speed and
reliability.

CX technology, which will ship initially with Tecmar's ProServe Novell data
management tape backup system, will also be featured in all future major
Tecmar product releases.

Setting Tecmar's CX technology apart from competing "concurrent backup"
technologies is Tecmar's implementation which results in superior
performance. "We developed CX technology to specifically improve backup
and restore operations in the network environment," said Stephen Bencke,
director, CX development. "With CX technology, our product line will be
able to meet the large volume backup demands of networks quickly while
improving restore operations."

CX technology features several software innovations that work together to
take full advantage of the network bandwidth. First, CX technology employs
distributed processing via FileFlow and active client data pumping
processes to maximize the performance of individual clients on the
network. Dynamic load balancing ensures maximum use of the network
bandwidth; with all clients backing up simultaneously, backup speed
becomes the sum of all the clients on the network.

Distributed processing essentially lets each client on the network operate
at its own top speed for both backup and restore operations. To speed
operations, Tecmar's patent pending FileFlow technique allows each client
agent to communicate with the tape server to share the workload. Rather
than invoking multiple "query-and-answer" dialogues with the tape server
before transferring data for backup, FileFlow empowers each client to
determine what needs to be backed up. This saves time as well as network
bandwidth by carrying fewer instructions and more data. Data pumping then
"pushes" the data blocks, in a greater number than is achievable in
competing systems, from the client through the network to the host tape
drive.

With CX technology, the clients rather than the server perform block
comparison operations. This alleviates the server from consuming, CPU
intensive block comparisons that typically occur during compare operations
and frees the server for other data management activities.

With multiple clients on the network, all transferring data to a single
tape drive simultaneously for backup, CX technology relies on dynamic load
balancing to maximize the speed of the entire network. Through dynamic
load balancing, data from all the workstations is optimally routed to
buffers on the host server and combined into a structured stream of
ordered alternating blocks which is transferred directly to the tape
drive.

When restoring data, Tecmar's CX technology provides for improved restore
speed. Similarly to backup operations, the network clients are empowered
to process the file and data stream, thereby eliminating consuming
dialogue with the server backup. And the active client data pumping system
allows the clients to receive data from each drive at its top speed.

Contributing significantly to the high restore performance is CX
technology's exclusive use of bitmapping. Bitmapping is used to tightly
encode the knowledge of how data was combined on the tape drive. It helps
to identify and locate all data blocks quickly for restore operations.
Thus, the drive is able to quickly pinpoint the data location to begin and
maintain data transfer. Competing approaches use databases to help locate
the first block of data, but the drive is still required to undertake a
time consuming search through the remainder of the tape to complete the
restore.

CX technology, by offering continuous streaming during backup/restore
operations, contributes to improved tape and tape drive life. Through
dynamic load balancing, the data from multiple clients is recorded on the
tape in ordered, alternating blocks. As a result, during restore
operations, the tape can continue streaming, sending requested data to the
buffer for the client to receive within its performance parameters.
Typically, for other applications, restore operations require the drive to
repetitively start and stop for tape repositioning. This creates wear and
reduces the life of both the tape and the drive.

CX technology will be available beginning September, 1993 on ProServe with
CX. Future product offerings will integrate CX technology.

Tecmar, founded in 1974, is a pioneer and international leader in
manufacturing enhancement products for personal computers. Tecmar is a
subsidiary of Rexon, Inc., whose common stock is traded on the NASDAQ
system, ticker symbol REXN. Tecmar markets its Novell, IBM and Apple
products through a worldwide network of dealers, distributors and VAR's.

Tecmar Inc, 6225 Cochran Rd, Solon, OH 44120
216/349-0600

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