Datakit

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A one-shelf datakit.

In telecommunications, a Datakit is a

Regional Bell Operating Companies (RBOCs)[4] in North America
.

Designing

A full datakit approx. 19 in. wide by 5 ft. tall.

A complete Datakit system measures approximately 19 inches wide and 5 feet tall. Datakit employs a cell relay protocol similar to Asynchronous Transfer Mode. (ATM). It is a connection-oriented switch, meaning that all data packets for a given call travel through the network using the same virtual circuit. Datakit networks continue to be used by major telephone companies in the United States.

Datakit interfaces include

EIA-232
connections to high-speed 500 Mbps fiber optic links, including 10/100 Mbps Ethernet links.

An adaptation protocol known as the Universal Receiver Protocol (URP) is utilized by Datakit. URP spreads protocol data unit (PDU) overhead across multiple cells and processes packets immediately. It assumes that cells arrive in the correct order; if they do not, it may force retransmissions.

The Information Systems Network (ISN), developed by AT&T Information Systems, was a precursor to Datakit. ISN was a packet-switching network similar to the System 75 digital platform. For both LAN and WAN applications, ISN used devices called concentrators, which connected via fiber optics over distances of up to 15 miles. Speeds on these connections ranged from 1200 to 5600 baud, with most end-users relying on dumb terminals. Early support for ISN and Datakit came from the National Customer Support Center (NCSC) in Englewood, Colorado, before being handled by AT&T Information Systems after company restructuring and support from Bell Labs.

History

Bell Laboratories relied heavily on Datakit for internal networking. On top of Datakit’s transport services, several operating systems, including

UNIX, implemented UUCP for email and remote login through dkcu (Datakit-based cu).[5][6]

Datakit’s design was similar to a telephone central office, using an area code plus a seven-digit numbering system. It was in production for at least three years before its full release.[citation needed]

In 1996, AT&T rebranded Bell Labs as

Lucent Technologies, which later merged with the French company Alcatel to become Alcatel-Lucent. Nokia ultimately acquired the company in 2016. By the late 1990s, Datakit was considered legacy technology and was gradually replaced by newer technologies such as IP and Ethernet. Lucent discontinued the Datakit product line, but a group of former employees formed Datatek Applications. Datatek licensed the technology from Lucent to support remaining Datakit users and to provide gateway solutions for transitioning to modern networks. However, due to a steady decline in Datakit users, Datatek Applications ceased operations in January 2018.[citation needed
]

See also

References

  1. McIlroy, M. D. (1987). A Research Unix reader: annotated excerpts from the Programmer's Manual, 1971–1986
    (PDF) (Technical report). CSTR. Bell Labs. 139.
  2. ^ Datakit, from the Free On-line Dictionary of Computing
  3. ^ "Collection:'EECS Technical Reports' - Search Results - Digital Collections".
  4. ISBN 9781602670006
    .
  5. ISBN 978-0-201-53067-4
    .
  6. ^ "CommKit Host Interface Release 4.4 AT&T 3B2 RISC Computer Systems Installation and Administration Guide" (PDF). Lucent Technologies. Archived from the original (PDF) on 12 Jun 2010. Retrieved 6 March 2025.
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