Protocol selector and protocol selection method
AssigneeHitachi, Ltd.
InventorsAtsushi Kobayashi, Kimitoshi Yamada, Toru Horimoto
Life of this patent
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Abstract
In communication which uses a communication line which allows the determination of a communication protocol in a communication port prior to the communication like in an ISDN network, a communication program corresponding to the determined communication protocol is dynamically linked and initialized to allow dynamic selection of the communication protocol.
Claims13
A communication system in which communication is effected between stations utilizing a communication line which allows for the determination of a protocol of a communication port prior to communication, wherein at least one of a sending station and a receiving station is capable of operating according to a plurality of communication protocols, comprising:
- a protocol selector including means for dynamically determining a communication protocol by negotiation between sending and receiving stations prior to the communication between the stations, during which a sending station proposes a protocol to a receiving station, the receiving station accepts or rejects the proposed protocol, and, when the receiving station rejects a protocol proposed by the sending station, the sending station proposes a different protocol until the receiving station accepts a proposed protocol.
A method of communicating between communication stations through a D channel and a B channel of an ISDN network, comprising:
- sending through the D channel from one of the stations to another station an identifier of a communication protocol used for communications through the B channel;
- sending a message informing that the designated communication protocol is acceptable after receiving the identifier and establishing said communication protocol in said another station;
- and
- establishing said communication protocol in said one station after receiving the message.
A communication system for communicating between communication stations through a D channel and a B channel of an ISDN network, comprising:
- a first station sending through the D channel toward a second station an identifier of a communication protocol used for communications through the B channel;
- and
- the second station sending a message informing that the designated communication protocol is acceptable if positive after receiving the identifier and establishing said communication protocol, while said first station establishes said communication protocol after receiving the message.
A method of communicating between communication stations through a D channel and a B channel of an ISDN network, comprising:
- (a) sending through the D channel from a sending station to a receiving station an identifier of a communication protocol to be used for communications between said sending and receiving stations through the B channel;
- (b) sending a release message from the receiving station to the sending station indicating that the protocol identified by said identifier is not acceptable;
- (c) responding in said release message in said sending station by sending to said receiving station an identifier of another communication protocol on said D channel;
- (d) repeating steps (b) and (c) until said receiving station accepts a communication protocol identified by an identifier received from the sending station;
- and then
- (e) sending a connect message from said receiving station to said sending station that the protocol indicated by the identifier is acceptable;
- and
- (f) establishing the accepted communication protocol in said sending and receiving stations.
Dependencies are inferred from the claim text.