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Power Tools 1993 November - Disc 2
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Power Tools Plus (Disc 2 of 2)(November 1993)(HP).iso
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1993-10-05
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EDITORIAL CONTACTS:
Karen Dudley, HP
(916) 785-4699
Deborah Siegel, IBM
(914) 642-5377
HP, IBM EXPAND 100BASE-VG TO SUPPORT TOKEN RING
PALO ALTO, Calif., Sept. 27, 1993 -- Hewlett-Packard
Company and IBM Corporation today announced that the
emerging IEEE standard 100Base-VG is being expanded to
include Token Ring support. The expanded technology, which
will be known as 100VG-AnyLAN, provides a growth path for
both 10Mbit/sec Ethernet and 16Mbit/sec Ring networks.
By leveraging their respective technology leadership --
HP in Ethernet, IBM in Token Ring -- the two companies will
submit and promote a standard that provides an evolutionary
and cost-effective alternative for higher-performance LANs.
100VG-AnyLAN addresses two key networking needs --
increased aggregate bandwidth for today's applications and
guaranteed bandwidth for deployment of emerging
applications. The technology gives Ethernet and Token Ring
users a low-cost upgrade path to move to high-speed LANs
while preserving existing investments in network operating
systems, applications, and cabling. In addition, because
the technology supports both Ethernet and Token Ring frame
formats, it is transparent to existing applications.
Evolutionary Approach
The technology makes it possible to incrementally migrate
a client, a server, a workgroup, or large groups.
100VG-AnyLAN is not a replacement for Ethernet or Token
Ring; it's not an either/or proposition. It is a logical
next step in the trend to high performance that allows
business needs to dictate when and where to upgrade.
100VG-AnyLAN's compatibility with existing Ethernet and
Token Ring LANs makes migration easy and cost-effective.
The only new network elements required for migration are a
concentrator and adapter cards. For existing LAN segments,
the existing NOS, applications, cabling, bridges, and
routers are not changed, thus preserving investments in
those assets.
The 100VG-AnyLAN technology is complementary to other
emerging LAN technologies -- ATM and switched LANs. It
provides increased bandwidth to switched LANs and will
interoperate with workgroups or backbones using ATM.
The preservation of Ethernet and Token Ring frames allows
the continued use of most network management tools currently
available for Ethernet and Token Ring LANs. 100VG-AnyLAN
supports the use of existing network management interfaces.
Standards
The movement to make 100VG-AnyLAN a standard was begun in
November 1992 when a proposal was made to the IEEE
committee. The IEEE meeting in July 1993 established an
802.12 standards committee to draft a standard. Many LAN
vendors have already expressed intention to use this
technology.
Technology Advances
A characteristic of 100VG-AnyLAN is the low latency
achieved by a new network protocol, Demand Priority -- a
frame-switching technique. Using Demand Priority, a station
wishing to transmit a packet signals its request to the hub
over its dedicated connection. If the network is idle, the
hub immediately acknowledges the request and the station
begins transmitting its packet to the hub. As the packet
arrives at the hub, the hub decodes the destination address
contained in the packet and automatically switches the
incoming packet to the outbound destination port. In
addition to operating at 100Mbits/sec, this Demand Priority
scheme enables guaranteed bandwidth.
At the physical level, a coding scheme called Quartet
coding, allows data to be transmitted at 100Mbits/sec over
unshielded twisted pair (UTP), as well as shielded twisted
pair (STP) and fiber optics.
Hewlett-Packard Company is an international manufacturer
of measurement and computation products and systems
recognized for excellence in quality and support. The
company's products and services are used in industry,
business, engineering, science, medicine and education in
approximately 110 countries. HP has 94,900 employees and
had revenue of $16.4 billion in its 1992 fiscal year.
The IBM Corporation is a global provider of advanced
information services, products and technologies. It is
headquartered in Armonk, N.Y.
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