Telenet

For other uses, see Telenet (disambiguation).

Telenet was a commercial packet switched network which went into service in 1974.^[1] It was the first packet-switched network service that was available to the general public.^[2] Various commercial and government interests paid monthly fees for dedicated lines connecting their computers and local networks to this backbone network. Free public dialup access to Telenet, for those who wished to access these systems, was provided in hundreds of cities throughout the United States.

The original founding company, Telenet Inc., was established by Bolt Beranek and Newman (BBN) and recruited Larry Roberts (former head of the ARPANet) as President of the company, and Barry Wessler. GTE acquired Telenet in 1979.^[3] It was later acquired by Sprint and called "Sprintnet". Sprint migrated customers from Telenet to the modern-day Sprintlink^[4] IP network, one of many networks composing today's Internet. Telenet had its first offices in downtown Washington DC, then moved to McLean, Virginia. It was acquired by GTE while in McLean, and then moved offices in Reston, Virginia.

Under the various names, the company operated a public network, and also sold its packet switching equipment to other carriers and to large enterprise networks.

History

After establishing "value added carriers" was legalized in the U.S., Bolt Beranek and Newman (BBN) who were the private contractors for ARPANET set out to create a private sector version. In January 1975, Telenet Communications Corporation announced that they had acquired the necessary venture capital after a two year quest, and on August 16 of the same year they began operating the first public packet-switching network.^[5]

Coverage

Originally, the public network had switching nodes in seven US cities:^[6]

• Washington, D.C. (network operations center as well as switching)
• Boston, Massachusetts
• New York, New York
• Chicago, Illinois
• Dallas, Texas
• San Francisco, California
• Los Angeles, California

The switching nodes were fed by Telenet Access Controller (TAC) terminal concentrators both colocated and remote from the switches. By 1980, there were over 1000 switches in the public network. At that time, the next largest network using Telenet switches was that of Southern Bell, which had approximately 250 switches.

Internal Network Technology

The initial network used statically-defined hop-by-hop routing, using Prime commercial minicomputers as switches, but then migrated to a purpose-built multiprocessing switch based on 6502 microprocessors. Among the innovations of this second-generation switch was a patented arbitrated bus interface that created a switched fabric among the microprocessors.^[7] By contrast, a typical microprocessor-based system of the time used a bus; switched fabrics did not become common until about twenty years later, with the advent of PCI Express and HyperTransport.

Most interswitch lines ran at 56 kbit/s, with a few, such as New York-Washington, at T1 (i.e., 1.544 Mbit/s). The main internal protocol was a proprietary variant on X.75; Telenet also ran standard X.75 gateways to other packet switching networks.

Originally, the switching tables could not be altered separately from the main executable code, and topology updates had to be made by deliberately crashing the switch code and forcing a reboot from the network management center. Improvements in the software allowed new tables to be loaded, but the network never used dynamic routing protocols. Multiple static routes, on a switch-by-switch basis, could be defined for fault tolerance. Network management functions continued to run on Prime minicomputers.

Its X.25 host interface was the first in the industry and Telenet helped standardize X.25 in the CCITT.

Accessing the Network

Basic Asynchronous Access

Users could use modems on the Public Switched Telephone Network to dial TAC ports, calling either from "dumb" terminals or from computers emulating such terminals. Organizations with a large number of local terminals could install a TAC on their own site, which used a dedicated line, at up to 56 kbit/s, to connect to a switch at the nearest Telenet location. Dialup modems supported had a maximum speed of 1200 bit/s, and later 4800 bit/s.

Computer Access

Computers supporting the X.25 protocol could connect directly to switching centers. These connections ranged from 2.4 to 56 kbit/s.

Other Access Protocols

Telenet supported remote concentrators for IBM 3270 family intelligent terminals, which communicated, via X.25, to Telenet-written software that ran in IBM 370x series front-end processors. Telenet also supported Block Mode Terminal Interfaces (BMTI) for IBM Remote Job Entry terminals supporting the 2780/3780 and HASP bisync protocols.

PC Pursuit

In the late 1980s, Telenet offered a service called PC Pursuit. For a flat monthly fee, customers could dial into the Telenet network in one city, then dial out on the modems in another city to access bulletin board systems and other services. PC Pursuit was popular among computer hobbyists because it sidestepped long-distance charges. In this sense, PC Pursuit was similar to the Internet.

Cities accessible by PC Pursuit

City Code	Area Code(s)	City
AZPHO	602	Phoenix, Arizona
CAGLE	818	Glendale, California
CALAN	213	Los Angeles, California
CODEN	303	Denver, Colorado
CTHAR	203	Hartford, Connecticut
FLMIA	305	Miami, Florida
GAATL	404	Atlanta, Georgia
ILCHI	312, 815	Chicago, Illinois
MABOS	617	Boston, Massachusetts
MIDET	313	Detroit, Michigan
MNMIN	612	Minneapolis, Minnesota
NCRTP	919	Research Triangle Park, North Carolina
NJNEW	201	Newark, New Jersey
NYNYO	212, 718	New York City
OHCLV	216	Cleveland, Ohio
ORPOR	503	Portland, Oregon
PAPHI	215	Philadelphia, Pennsylvania
TXDAL	214, 817	Dallas, Texas
TXHOU	713	Houston, Texas
WIMIL	414	Milwaukee, Wisconsin

See also

• Tymnet

References

1. ^ C. J. P. Moschovitis, H. Poole, T. Schuyler, T. M. Senft, History of the Internet: A Chronology, 1843 to the Present, p. 79-80 (The Moschovitis Group, Inc 1999)
2. ^ Stephen Segaller, NERDS 2.0.1: A Brief History of the Internet, p. 115 (TV Books Publisher 1998)
3. ^ Cybertelecom :: Industry :: Genuity
4. ^ Sprintlink.net
5. ^ "Electronic post for switching data." Timothy Johnson. New Scientist. May 13, 1976
6. ^ Telenet inaugurates service,ACM Computer Communications Review, Stuart L. Mathison, 1975
7. ^ Byars, S. J.; Carr, WN (31 January), "Patent Bus Interface", US Patent 4,802,161 (U.S. Patent and Trademark Office), http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=8&f=G&l=50&d=PTXT&p=1&p=1&S1=908056&OS=908056&RS=908056, retrieved 2007-09-18