Multiplex communications – Channel assignment techniques – Carrier sense multiple access
Patent
1995-04-26
1997-11-11
Olms, Douglas W.
Multiplex communications
Channel assignment techniques
Carrier sense multiple access
370453, 370465, 370522, H04L 1244
Patent
active
056871740
ABSTRACT:
Support for a mixed network environment is provided which can contain multiple isochronous and/or non-isochronous LAN protocols such as isochronous-ethernet, ethernet, isochronous-token ring, token ring, other isochronous-LAN or other LAN systems. Support for a mixed environment includes a protocol detection mechanism which is embodied in a handshaking scheme. This handshaking scheme determines the signalling capability at the end points of the link and implements the correct protocol. This enables isochronous nodes and hubs to automatically detect the presence of ethernet, token ring, or other LAN equipment at the other end of the network cable. If this detection occurs, the isochronous LAN equipment will fall-back to a LAN compliant mode of operation. Typically, only the hub will have the capability of operating in different networking modes, such as ethernet, Token Ring isochronous modes. The hub will listen for some form of identification from the attached nodes as to the type of service to provide--isochronous or non-isochronous; ethernet, token ring or other LAN service.
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Edem Brian C.
Worsley Debra J.
National Semiconductor Corporation
Nguyen Chau T.
Olms Douglas W.
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