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ARPANET short blocking feature (RFC0852) Disclosure Number: IPCOM000003899D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 9 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A.G. Malis: AUTHOR

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 17% of the total text.

Request for Comments: 852

The ARPANET Short Blocking Feature

RFC 852

Andrew G. Malis

ARPANET Mail: malis@bbn-unix

Bolt Beranek and Newman Inc.

50 Moulton St.

Cambridge, MA 02238

April 1983

This RFC specifies the ARPANET Short Blocking Feature, which will

allow ARPANET hosts to optionally shorten the IMP's host blocking

timer. This Feature is a replacement of the ARPANET non-blocking

host interface, which was never implemented, and will be

available to hosts using either the 1822 or 1822L Host Access

Protocol. The RFC is also being presented as a solicitation of

comments on the Short Blocking Feature, especially from host

network software implementers and maintainers.

ARPANET Short Blocking Feature April 1983

RFC 852


This RFC specifies the ARPANET Short Blocking Feature, which will

allow a host to shorten the amount of time that it may be blocked

by its IMP after it presents a message to the network (currently,

the IMP can block further input from a host for up to fifteen


The Feature is an addition to the ARPANET 1822 and 1822L Host

Access Protocols, and replaces the non-blocking host interface

described in section 3.7 of BBN Report 1822 [1], which was never

implemented. This Feature will be available to hosts on C/30

IMPs only. This will not present a problem on the ARPANET, which

only has C/30 IMPs, but hosts on non-C/30 IMPs in networks that

mix C/30 and non-C/30 IMPs will not be able to use the Short

Blocking Feature.

The RFC's terminology is consistent with that used in Report

1822, and any new terms will be defined when they are first used.

Familiarity with Report 1822 (section 3 in particular) is


This RFC was once part of RFC 802, which is now obsolete and has

been replaced by the combination of this RFC and RFC 851, The

ARPANET 1822L Host Access Protocol [2]. The Short Blocking

Feature will be available to all hosts on C/30 IMPs, no matter

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ARPANET Short Blocking Feature April 1983

RFC 852

which (1822 or 1822L) host access protocol they are using to

communicate with the IMP.

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