- מו"ל: Digital Equipment Corporation
- פורמט: חוברת
- נמסר ע"י: ענת כרמי
- תגיות:
OCR (הסבר)
Site & Campus Networks
TO: Facilities Managers
RE: The Local Area Challenge
Over the years, groups within your organization have
been networking computers throughout your facilities
to better share information and applications. During
that time, you’ve probably overseen the installation of
two different networking technologies — Token Ring
and Ethernet.
Now the world is changing. The number of users is
increasing rapidly, creating a strain on your existing
local area networks (LANs). Your users are moving
sophisticated graphics and applications from worksta-
tion to workstation, requiring greater network speed
and performance. Isolated LANs are proliferating, and
users want them integrated to freely access applications
and resources regardless of LAN type. And management
of all these fragmented resources is keeping network
managers awake at night.
Digital is the leader in the development and use of
networking technologies. We carry a full complement
of both Ethernet and Token Ring products for your
midspeed applications. And our suite of award-winning
FDDI (Fiber Distributed Data Interface) products
provides the answer for high-performance connections
between or within workgroups, between LANs, and
across an entire campus. You get the best of both
worlds — FDDI for network speed where you need
it to handle image, video, and data, and the flexibility
to interoperate with existing Ethernet and Token
Ring solutions.
We want to help you build and maintain a flexible
network infrastructure that gives you the ability to grow
and extend LANs, as needed, and to integrate the
various LAN technologies into a single, manageable
resource. This package gives you easy access to straight
answers about our solutions for site and campus
networks. As you investigate your options here and
elsewhere, you'll see what we mean when we say
Digital is the Open Advantage.
Networks Marketing
Digital Equipment Corporation
Growth often brings with it the need for better
network integration. You’re expanding operations
into new facilities. Whole campuses have to be
integrated.
High
Extended
LANs
Numbers
of nodes
Any LAN
Technology
————_—_ 7
Applied network load
With Digital, the advantage to you is the freedom to
choose the most appropriate LAN access technology —
or combination of technologies — to satisfy your
business needs. Digital will bridge and interconnect
various LANs into a single, enterprisewide,
multivendor LAN or WAN. &
Networks encourage the free flow of information
throughout an enterprise by providing individuals ready
access to data, applications, and other people. Typically,
computers are arranged into LANs when organizations
need reliable data transfer and communications within a
building or a cluster of buildings, such as a campus or
office complex. Bridges connect LANs over distances
that exceed the capabilities of a single LAN; such
configurations are known as extended LANs.
Local Area Network Technologies
Any LAN technology (802.3/Ethernet, 802.5/Token
Ring, etc.) — given a low number of connections and
low applied network load — can satisfy your network-
ing needs. Token Ring networks have been optimized
for small group and office networking environments. As
the number of connections increases, 802.3/Ethernet
LANs are best suited to meet the data requirements of a
large user population.
With the proliferation of more powerful compute
engines and network-intensive applications, network
load conditions begin to exceed the capabilities of
traditional LANs. FDDI provides you with high-band-
width, high-performance networking solutions to
interoperate seamlessly with existing LANs.
As LANs increase in size as well as complexity, high-
performance bridges are used to create extended LANs.
Bridging technology allows LANS to be extended to
greater distances and makes it possible to interconnect
similar and dissimilar LANs into a single network. And it
improves overall network performance by providing
traffic management through selective filtering. Extended
LANs satisfy the high number of connections as well as
the high applied network loads of today’s growing and
active networks.
By integrating FDDI backbones and Ethernet or Token
Ring sub-LANs with bridge technology, you can take
advantage of the best technology available today to
meet your current and future business requirements,
while preserving network investments you’ve made in
the past.
You are faced with physical building wiring changes;
connections between the users and the data center
change frequently due to people and whole depart-
ments moving within a building or campus. And
technology enhancements demand higher bandwidth
from existing cable plant facilities. The future will
demand even more, including integrated voice, data,
and imaging/video.
Intelligent Building
|
l
Flexible, Multimedia Building Wiring Systems|
Digital’s OPEN DECconnect System provides the
physical connection between devices on a network. It
supports the widest range of media types and provides
the broadest range of solutions of any major wiring
system. It complies with the EIA/TIA 586 Commercial
Building Wiring Standard, which is the basis for all
worldwide campus and building wiring in the '90s.
The OPEN DECconnect structured wiring system
supports copper and fiber applications and provides the
structured wiring utility that guarantees reliable, low-
cost connections. All components and applications are
tested to exceed the requirements of existing standards.
Wiring connections, regardless of application, are
transparent to the user.
The OPEN DECconnect System consists of five sub-
systems that provide campus backbone connections,
building backbone wiring, horizontal wiring to the
workgroups, work area wiring to connect the physical
equipment, and administration.
Digital allows for true distributed computing by
connecting everything from mainframes and
workstations to personal computers, intelligent
terminals, and peripherals into the enterprise. And
with OPEN DECconnect, you have the convenience of
a high-quality, single-source supplier for all your
wiring needs — solutions that work
... and work together. &
You have a growing number of users — on terminals,
PCs, and workstations — and you need to tie them all
into a single, reliable network throughout your site.
y
Or maybe, you currently have no local area network
in place, but you have VAX systems in various
departments, and your organization has made a
decision that Token Ring will be your LAN of choice.
Users moving large amounts of data — including
graphic-intensive applications — are devouring your
network bandwidth. In many cases, workgroups in
those facilities now have powerful workstations, and
your current network bandwidth hinders communica-
tions between these users. You need to provide
greater network speed and performance throughout
a facility or campus. To improve efficiency and
reliability and to support concurrent efforts, you need |
fo connect various operations.
[TAN Flexibility |
as
Ethernet
Ethernet is the most popular local area network
technology available today, performing at speeds of 10
million bits per second (Mb/s). It provides more than
enough speed and bandwidth for organizations to run
such applications as electronic mail, word processing,
and general data processing. Ethernets are easily
modified and expanded to accommodate new users in
growing companies, are easy to maintain, and have
been in existence for over a decade.
Token Ring
Token Ring performs at speeds of 4 Mb/s or 16 Mb/s. It
gets its name from the fact that the nodes in Token Ring
LANs are connected by point-to-point links to form an
unbroken circular configuration. Token Ring topology
allows nodes to put data and destination address in a
“token packet” and send it on its way. The destination
node checks the token packet, copies the data, and
returns the packet to the original source node. The
source node clears the data within the packet and
makes it available for the next user.
FDDI
FDDI — Fiber Distributed Data Interface — is the
network of the 90s. FDDI's 100-Mb/s LAN technology
has been optimized for fiber optics and moves large
amounts of data. It represents a ten-fold increase in
speed over Ethernet and an even greater increase in
speed over the 4-Mb/s Token Ring standard. Because of
its speed, FDDI allows quick transfer of applications that
used to demand enormous network resources.
Ethernet LANS - A Viable and Effective Resource
The reasons for Ethernet’s popularity stem from its
simplicity and flexibility. Based on bus technology —
where all stations share a single communications
channel — Ethernet broadcasts information from each
node to the entire channel, where the destination node
listens to transmitted traffic and copies only the
designated packets. Ethernet is easy and cost-effective
to configure and expand in most physical layouts such
as rooms, buildings, or clusters of buildings. There is
no predetermined address at which Ethernet nodes
must be placed, making Ethernet highly flexible
and extendable.
When many users need to share software and informa-
tion from multiple devices and platforms over Ethernet
LANs, Digital provides powerful InfoServer network
storage servers. Designed for ease of use, the InfoServer
family delivers versatile, high-speed solutions for up to
100 users who need to share volumes of information.
Ethernet
|
j
C7
These cost-effective products support both read-only
and read-write media and allow PC users to take
advantage of more than 6,000 CD applications. As a
single, centralized location for software distribution,
Digital’s InfoServer family makes installing and updating
software much easier.
Token Ring Solutions
Token Ring is rapidly growing in popularity, and Digital
now extends and delivers the Open Advantage to Token
Ring users as well as Ethernet and FDDI users. Using
multiprotocol bridging routers, Digital can fully
integrate Token Ring connected desktop systems with
your entire computing environment, increasing
network efficiency, manageability, and overall perfor-
mance and providing integration for multiprotocol LAN
and WAN environments.
Ethernet from Digital gives you the low-cost, reliable,
expandable network infrastructure you need to link a
growing number of users and respond to today’s
rapidly changing requirements. With Digital, you get
the freedom to choose the network technology that
best suits your needs. &
FDDI - The Next Generation
FDDI, used over multiple types of communications
media (i.e., fiber and coppen), is rapidly becoming the
dominant high-speed LAN-based communications
network of the ’90s. Working with Digital, a prominent
leader in FDDI, you can take advantage of this new
technology.
1000
LAN 100
Bandwidth 49
Required
10 100 1000
MIPS of Network End Station
High-Performance FDDI Workgroups
A workgroup configuration is characterized by a ;
relatively small number of attached devices spread over
a limited geographical area. DECconcentrators and DEC
FDDIcontrollers provide the workgroup connectivity
required for fiber or copper connection.
High-Performance FDD! Backbones
FDDI is an ideal technology for the hub or backbone
that Jinks other LANs — especially in client/server
networks. A high-speed FDDI backbone relieves
backbone congestion and increases network reliability.
Digital offers a family of bridges that connect FDDI to
Ethernet segments. These standards-compliant devices
provide configuration flexibility, so systems can be
configured and changed as needed.
These are translating — not encapsulating — bridges.
They actually convert the packets to and from FDDI god
Ethernet rather than merely putting an “FDDI envelope
on the Ethernet packet. Translation means a more
efficient, less proprietary bridge.
Concentrators and bridges are used to build hierarchical
interconnections for departmental systems or intercon-
nections to other LANs, either FDDI or Ethernet. FDDI
backbones are also ideal for connecting VAXcluster
Systems. They can also be extremely effective in local
multibuilding environments.
DECconcentrator Family
The concentrator is the basic building block of the FDDI
network. Digital’s DECconcentrator can be used to
connect high-performance systems and workstations to
the FDDI network and establish FDDI backbone
connections to Ethernet networks using bridges. As a
standalone device, the DECconcentrator can be used to
create small, dedicated, high-performance LANs for
specialized communities of users.
DEC FDDIcontroller Family
Where network-intensive applications are needed,
Digital provides the DEC FDDIcontrollers to create
tightly coupled workgroups at FDDI speed. These
products link workstations and VAX systems directly
into the FDDI network.
Fiber is rapidly becoming the dominant LAN-based
communications media, and with FDDI from Digital
you can take advantage of its numerous benefits.
Your workgroups can grow and add resources
easily and share complex applications. And you get
greater freedom of choice and higher performance
across your entire network. ©
You have installed several LANs running different
LAN operating systems and various LAN access
methods, and you need to provide consistent
capabilities to all of your users. But as you grow and
consolidate resources, you face a confusion of
disparate networking technologies: an Ethernet
backbone, one group with an Ethernet LAN, another
with Token Ring, and still another moving to FDDI.
Each has implemented the specific network solutions
needed at the time. Now these solutions seem to be
closing groups off from one another. You need to
integrate these isolated LAN technologies — these
“islands of computing.”
Digital provides a truly integrated computing
environment regardless of your LAN access technol-
ogy making it much easier for users to share files
and other resources. With Digital, you have the
freedom to choose the networks that best serve the
needs of the users. 5
(Network Integration |
Ethernet/Token Ring Connectivity
Now two separate media access technologies —
Ethernet and Token Ring — can be integrated. Digital
goes far beyond simple connectivity in this arena and
provides full transparent integration of Token Ring and
Ethernet systems and applications. Users who could
never before use files and applications in the other
environment can now share information and
interoperate seamlessly across the two environments.
With a multiprotocol bridging router from Digital, you
can now route DECnet packets between Ethernet and
Token Ring networks, Digital’s PATHWORKS products
for DOS and OS/2 product allow users to share applica-
tions and server and network resources transparently
between Ethernet and Token Ring LANs through the
router. In addition to the new functionality of routing
DECnet packets between Ethernet and Token Ring,
Digital provides capabilities via PATHWORKS products
to route and integrate TCP/IP and IPX packets, as well.
Token Ring LANs can now be transparently integrated
into a multitechnology, multivendor network.
FDDI/Token Ring/Ethernet Integration
The seamless integration of FDDI, Token Ring, and
Ethernet technologies now gives users the freedom to
choose the most appropriate interconnect method or
combination of methods for their particular environ-
ment. Digital’s Token Ring product set combines with
existing Ethernet and FDDI offerings to form the
foundation for multivendor, multitechnology LANs.
You are responsible for all the building cabling, and
for the overall LAN, running both TCP/IP and DECnet,
with its plethora of equipment — bridges, routers,
gateways, etc. Your users are adding PCs and
workstations to the network from a multitude of
vendors. You must make certain that everything is
functioning correctly and the network is providing the
performance required. You need to control your entire
campus environment.
With DEcmcc, you have a single, integrated manage-
ment solution that gives you the ability to monitor
and control every network component that can be
managed and to improve overall network efficiency
in your mulfivendor, multiprotocol, open network. O
[/DECmce =The Management Platform for the” 905) j
Given the extensive technological changes of the past
several decades and the increasingly complex nature of
most business information infrastructures, your organi-
zation must take charge of its information resources —
manage, operate, and plan for future growth and
performance. In order to achieve full control, you need
an integrated management system that can bring
together information from all elements in the environ-
ment — existing management systems as well as
individual delivery components.
The DECmcc family employs breakthrough technology
in the areas of modeling, collecting, storing, and
processing management information in order to provide
flexible, extensible management. Using object-oriented
programming and database techniques, the DECmcc
Director provides an integrated structure for the storage
and use of multivendor management information. It
includes published interfaces that allow complete
flexibility in the management of any device, existing
management system, application, or other designated
entity. The consistent user interface provided by
DECmcc permits management of the entire environ-
ment from a single screen.
Based on standards (but not restricted to those stan-
dards), the DECmcc product family provides a manage-
ment platform that will allow you to control and analyze
the entire environment — systems, applications,
networks, voice, data, image, and video — all compo-
nents and vendors. Because of its modular design, it can
easily incorporate new standards and technologies as
they emerge. DECmcc is flexible and can adapt to an
organization’s management approach, whether manage-
ment is distributed throughout the facility, centralized,
or a combination of both.
[THE OPEN ADVANTAGE |
With Digital, you can install, combine, consolidate, and
grow your network throughout your site or campus,
using the networking technology or combination of
technologies that are right for your users. Take advan-
tage of Ethernet’s flexibility.
Add Token Ring where you need it. Move to FDDI for
the speed. Digital provides the high-performance
products to create these networks and to seamlessly and
effectively integrate them. And it’s all transparent to the
uSETS.
Digital is your single source for everything. From wiring
to transport to partnering with other suppliers, Digital
provides complete multivendor solutions, combining
multiple LAN technologies and ensuring that everything
works with everything else.
At Digital, we have a proven record in networking over
the past two decades, and we offer a comprehensive
range of networking products and services to address
the variety of needs you face as you manage your
facilities.
[Werldwide Network integration Services |
In today’s environment a successful enterprise must
have a fully integrated network infrastructure that
supports its business strategies. Digital offers full
worldwide network integration services to help you
plan, design, implement, and manage your network, no
matter who manufactured the pieces. That’s because
Digital’s strategy is based on an open environment —
Open Technology, Open Services, and Open Business
Practices.
All of these efforts combine to make up Digital’s Open
Network Advantage — products and services available
to you anytime, any place, for any solution. . . from
smaller Desktop Networks . . . to Campus Networks and
High-Performance LANs . . . to Multisite Enterprise
Integration.
Digital ... The Open Advantage
Digital believes the information in this publication is acc
as of its publication date; such information is subject to
change without notice. Digital is not responsible for any
inadvertent errors.
The following are trademarks of Digital Equipment Corpc
tion: the DIGITAL logo, ADVANTAGE-NETWORKS, VMS,
DECnet, ALL-IN-1, DECwrite, DECserver, DECagent,
DECconnect, DECNIS, eXcursion, MOBILIZER, DEC,
PATHWORKS, ULTRIX, DECquery, DEChub, DECbridge,
VAX, DECconcentrator, DECmcc,VAXcluster, LAT.
OS/2, IBM, PROFS, and SNADS are registered trademarks «
International Business Machines Corporation. Macintosh
LocalTalk, AppleTalk, and AppleShare are registered trade
marks of Apple Computer, Inc. UNIX is a registered trade
of UNIX System Laboratories, Inc. Microsoft is a registerec
trademark of Microsoft Corporation. NetWare and Novell
registered trademarks of Novell, Inc. NFS is a registered
trademark of Sun Microsystems, Inc. ProNET is a register
trademark of Proteon, Inc. AT&T is a registered trademar
American Telephone & Telegraph Company. MCI is a reg
tered trademark of MCI Communications Corporation.