Method and apparatus for testing station address in network

Details Method and apparatus for testing station address in network Method and apparatus for testing station address in network

1990-02-13

1991-01-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, H04J 314

Patent

active

049842331

ABSTRACT:
A method for performing a duplicated address test used for a network including a first ring transmission line, a second ring transmission line having a signal transmission direction opposite to that of the first ring transmission line, and a plurality of stations connected to at least one of these ring transmission lines. Each of these stations has a flag DAC representing whether or not the duplicated address test is performed, and some of the plural stations constitute a plurality of control nodes having a configuration function of the network. The flag DAC of each of the stations is reset at a time instant when a power source of this station is turned on, and also when any of the control nodes receives the sent out configuration control frame. Each of the stations having the reset flags DAC sents out the duplicated address test frame to either the first or second transmission line to which the station is connected when a token frame to control a transmission right is captured. When another station having the same address as that of a source station receives the test frame, a discriminator indicative of an address duplication is added to this test frame.

REFERENCES:
patent: 4689786 (1987-08-01), Sidhu et al.
"Token Ring Access Method and Physical Layer Specifications", IEEE Std. 802.5-1985, (ISO/dp 8802/5).
IEEE 802 Local Area Networks 802.5 (Token Ring Access Method) Recommended Practice for Dual Ring Operation with Wrapback Reconfiguration.

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