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Communication Networks '90: from access to zero bits, CN seminars covered it all.

Communication Networks '90

From Access to Zero Bits,

CN Seminars Covered It

Broadband networking isn't off in the distant future. It is here today, John McQuillan told a packed Communication Networks seminar.

McQuillan, president of McQuillan Consulting, said there are 1.3 million miles of fiber installed in the U.S., and 400Mb/s is possible today. He said 1.7 Gb/s capacities, in development for two years, will be possible soon.

"People out there are greedy. They want more than 10 million bits per second," said McQuillan. "When you talk to them, you understand. They don't want to slow down when they go off the LAN onto a backbone."

He predicted that terabit (trillions of bits) networking, with photonic switching, will arrive in the 1990s.

Comparing Fiber Distributed Data Interface and 802.6 metropolitan networks, McQuillan says the battle lines are drawn.

"The telephone companies are vigorously going to 802.6 and the computer companies are vigorously going to FDDI," McQuillan said. "This is a classic war."

McQuillan said 802.6, over single-mode fiber, can give far higher speeds than multimode FDDI and far lower access times. FDDI is restricted to two kilometers, while 802.6 is essentially unrestricted.

TCP/IP Evolution

In general, the architecture which delineates a firm boundary between wide and local areas is the one in which TCP/IP technology evolved, said Jack Haverty.

He cited DoD Internet, built on top of wide-area Arpanet during research which developed TCP/IP protocols.

This structure is being replicated in the DoD operational military environment, using X.25-based Milnet as the wide-area foundation. Here the router function is more akin to PAD of CCITT terminology, mainly responsible for implementing and controlling access of local workstation devices to the WAN.

Dan Lynch noted that it is possible to integrate TCP/IP into corporate networks.

As Maine Goes ...

The rule in presidential elections is "as Maine goes, so goes the nation." It may also be true in technology.

So says Carl Weston, assistant deputy commissioner for the state of Maine. He told a seminar his state is positioning itself on the leading edge.

For example, Weston said, Maine established an ISDN primary rate link between two Definity switches, with AT&T assistance. The link provides the network ID of the caller and is used to pass accounting data and voice mail. The state is the first user in Maine of digital service from the central office.

Maine is also leveraging deployment of a digital network across the state through a state lottery contract, and contracted with New England Telephone for a commitment of 30,000 hours of toll calls at a "very flat" discount rate.

"Being on the leading edge is usually not a characteristic of state government, but it is paying big dividends in Maine," Weston said.

Comparing To Japan

A seminar examining Washington politics said, "The argument is over the present. The discussion should be about the future."

Inevitable comparisons with Japan 2000 were made. Japan will:

* be investing about twice per customer line what we are;

* be 100% digital;

* have fiber to the home;

* see information 20% of GNP (same as cars are today).

Disaster Plans

Dennis Krysmalski told why you should plan for disaster prevention.

Things go wrong only if you fail to take action to prevent them. If you plan to survive the worst cased and avoid its happening, it won't happen and you'll survive. Lastly, a failure you planned for can't hurt you.

ISDN Wins One

Automatic number identification (ANI) saved a food manufacturer millions of dollars and brough the FBI to a crank caller's door in a few hours.

The caller, dialing up what he thought was the food company, was actually calling telemarketer American Transtech in Jacksonville, Fla., Nancy Brown, project manager for the AT&T subsidiary, told a seminar.

The caller claimed to have put poison in the food maker's products, but an alert agent taped the call and had the caller's number. The FBI was at the caller's door within three hours, and determined the threat was unfounded.

It would have cost the food maker millions of dollars to pull its products off the shelves, Brown said.

She said ISDN saves American Transtech three cents a call on three million inbound and outbound calls a month.

Integrated Networks

A panel on voice-data integration offered pathways for integrated bckbone networks.

First, bring data applications into an existing voice network by turning some voice circuits into data in off-hours. Or explore T1s, carrying data with the excess bandwidth.

Second, use spare bandwidth inherent in a data network to carry voice.

Start with a T1, T3, or FTI backbone that is sufficient to satisfy all of your data needs.

Add in capacity to reroute high priority circuits when a link or node fails. Assign each data circuit a physical path in the network and create a residual backbone capacity table for voice traffic.

Third, design an integrated voice and data network from scratch.
COPYRIGHT 1990 Nelson Publishing
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1990 Gale, Cengage Learning. All rights reserved.

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Author:Tanzillo, Kevin
Publication:Communications News
Date:Mar 1, 1990
Words:831
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