Browse Prior Art Database

Active Ring Monitor Mode

IP.com Disclosure Number: IPCOM000045430D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Volk, JR: AUTHOR [+2]

Abstract

In a ring-structured data communication network applicable to distributed processing, data processing software at ring nodes may invoke a monitor mode of operation.

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This is the abbreviated version, containing approximately 82% of the total text.

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Active Ring Monitor Mode

In a ring-structured data communication network applicable to distributed processing, data processing software at ring nodes may invoke a monitor mode of operation.

In this mode, ring interfacing (adapter) equipment at a receiving node discards messages incoming from the ring which have either a "broadcast" destination address or an origin address different from the local address assigned to the station, with certain exceptions. The "broadcast" messages are messages which are intended for reception at all stations or all stations in a group of stations. The exceptions are externally originated messages indicating a status inquiry relative to the respective station or an open/short condition on the ring. Consequently, stations operating in this mode are effectively timed to receive (and monitor) only their own transmissions.

Any station attempting to communicate with a station in active monitor mode will receive a busy response and post an exception interruption to its respective data processing software. The monitor mode can be terminated by a reset signal from the respective processor, an explicit command from the respective processor, an open/short broadcast signal sent by another station, or a message which the station transmits to itself through the ring.

While in the active monitor mode, a station can request status and error log information from other stations on the ring, thereafter circulate a frame instructing itself to terminate...