Method and apparatus for quick modem reconnect
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Accused Products
Abstract
A quick startup procedure for a modem system utilizes known characteristics of a previously established communication channel to reduce the initialization period associated with subsequent connections over the same channel. In response to the establishment of a call, the modem devices determine whether the quick connect protocol is supported. If so, then the called modem transmits a modified answer tone to the calling modem. The calling modem analyzes the signal received in response to the modified answer tone to determine whether characteristics of the current channel are similar to stored characteristics associated with a previous connection over the same channel. If a channel “match” is found, then the modem devices carry out a quick initialization routine that eliminates, abbreviates, or modifies a number of procedures or protocols that are carried out in conventional modem startup processes. The general quick startup techniques may also be applied in the context of a quick reconnect procedure that can be performed in response to a temporary pausing or disconnecting of the data modem mode.
43 Citations
65 Claims
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1-30. -30. (canceled)
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31. A method of reducing time for use by a first modem to reconnect to a second modem via a communication channel, said method comprising the steps of:
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receiving a reconnect indication by the second modem in response to a reconnect indication;
transmitting a transition sequence to the first modem;
transmitting a signal point sequence to the first modem;
acknowledging the first modem received the signal point sequence; and
transmitting data at full data rate. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. A method of reducing time for use by a first modem to reconnect to a second modem via a communication channel, said method comprising the steps of:
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receiving a request to terminate a temporary pause in a modem communication session;
receiving a reconnect indication by the second modem;
transmitting a transition sequence to the first modem;
transmitting a signal point sequence to the first modem;
determining whether the signal point sequence has been received by the first modem;
acknowledging the first modem received the signal point sequence;
obtaining characteristics and parameters associated with channel connections prior to temporary hold of modem connection; and
transmitting data at full data rate. - View Dependent Claims (39, 40, 41, 42)
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43. A method of reducing time for use by a first modem to reconnect to a second modem via a communication channel, said method comprising the steps of:
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establishing a call between the first modem and the second modem;
placing the second modem in an off hook state;
initializing a capabilities exchange protocol;
transmitting by a first modem a quick connect identifier to the second modem;
transmitting a quick connect acknowledgement by the second modem;
obtaining by the second modem signal points for use in a transition sequence;
transmitting by the second modem a transition sequence;
transmitting by the second modem a specific signal point sequence;
obtaining by the first modem a received sequence that is related to the signal point sequence;
determining whether a characteristic of a current channel is similar to a corresponding characteristic of a previously established channel;
triggering by the second modem a quick startup routine;
issuing a connect message to host software;
transmitting authentication data over the communication channel by the first and second modems;
exchanging constellation parameters and modulation parameters; and
transmitting data at full data rate. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A method of reducing time for use by a first modem to reconnect to a second modem via a communication channel, said method comprising the steps of:
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dialing by the first modem a telephone number associated with the second modem;
placing the second modem in an off hook state;
initializing capabilities exchange protocol;
transmitting by a first modem a quick connect identifier to the second modem;
transmitting a quick connect acknowledgement by the second modem if the second modem supports a quick connect methodology;
obtaining by the second modem signal points for use in a transition sequence;
transmitting by the second modem a transition sequence;
transmitting by the second modem a specific signal point sequence;
obtaining by the first modem a received sequence that is related to the signal point sequence;
comparing by the first modem a number of attributes of a previously received sequence associated with a previously established communication channel;
determining whether a characteristic of a current channel is similar to a corresponding characteristic of a previously established channel;
obtaining and saving by the first modem a number of attributes or characteristics of a previously established connection to a current channel;
triggering by the second modem a quick startup routine;
conducting error correction and data compression protocols by the modem system;
issuing a connect message to host software;
transmitting authentication data over the communication channel by the first and second modems;
exchanging constellation parameters and modulation parameters; and
transmitting data at full data rate. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65)
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Specification