An internodal protocol for packet switched data networks

ABSTRACT

This paper describes a proprietary data transmission protocol developed for internodal trunks on the Northern Telecom SL-10™ Packet Switched Data Network. The protocol has been implemented and tested in the new Universal Trunk Processor. Two separate market forces dictated the protocol requirements. The first was a demand for high speed trunks in the T1 (1.54 Mb/s) and above range to cost effectively serve future networks. The second market force was the emergence of satellite data technology with its attendant high bandwidth and lower cost. A protocol with a large sequence number range and the ability to selectively retransmit more than one packet in error without impacting the flow of correctly received packets was required. None of the standard data protocols met these requirements.

REFERENCES

• 1: D. Sproule and F. Melior, "Routing, Flow, and Congestion Control in the Datapac Network", IEEE Trans. on Communications, Vol. Com-29, No 4, April 1981.
• 2: S. Lin, D. J. Costello Jr., and M. J. Miller, "Automatic-Repeat-Request Error-Control Schemes", IEEE Communications Magazine, Vol. 22, No. 12, pp. 5-17, Dec 1984.
• 3: European Computer Manufacturers Association (ECMA), "HDLC / CM Elements of Procedure (Checkpoint Mode)", Working Paper ECMA / TC24 / 81 / 38, April 1981.

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Packet-switching networks

Additional Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS

General Terms:
Design, Documentation, Experimentation