Method and apparatus for fast V.90 modem startup
First Claim
1. A training method for use by a first modem to reduce a training time for training said first modem with a second modem, said training time including a capabilities exchange phase time, a probing phase time, an impairment learning phase time and a constellation phase time, where said first modem is capable of training with said second modem over a communication channel in accordance with the V.90 modem protocol including the V.8bis capabilities exchange phase, said training method comprising the steps of:
- receiving a call from said second modem to establish said communication channel;
initiating, in response to said call, a modified V.8bis capabilities exchange phase of the V.90 modem protocol, wherein said modified V.8bis capabilities exchange phase of the V.90 modem protocol is indicative of a fast connect capability;
receiving a fast connect capability identifier from said second modem in response to said fast connect capability; and
skipping at least a portion of the V.8bis capabilities exchange phase of the V.90 modem protocol to reduce said capabilities exchange phase time, said skipping step being performed in response to said receiving said fast connect capability identifier.
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Accused Products
Abstract
A fast 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 fast 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 fast initialization routine that eliminates, abbreviates, or modifies a number of procedures or protocols that are carried out in conventional modem startup processes.
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Citations
10 Claims
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1. A training method for use by a first modem to reduce a training time for training said first modem with a second modem, said training time including a capabilities exchange phase time, a probing phase time, an impairment learning phase time and a constellation phase time, where said first modem is capable of training with said second modem over a communication channel in accordance with the V.90 modem protocol including the V.8bis capabilities exchange phase, said training method comprising the steps of:
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receiving a call from said second modem to establish said communication channel; initiating, in response to said call, a modified V.8bis capabilities exchange phase of the V.90 modem protocol, wherein said modified V.8bis capabilities exchange phase of the V.90 modem protocol is indicative of a fast connect capability; receiving a fast connect capability identifier from said second modem in response to said fast connect capability; and skipping at least a portion of the V.8bis capabilities exchange phase of the V.90 modem protocol to reduce said capabilities exchange phase time, said skipping step being performed in response to said receiving said fast connect capability identifier. - View Dependent Claims (2, 3, 4, 5)
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6. A first modem capable of reducing a training time for training with a second modem, said training time including a capabilities exchange phase time, a probing phase time, an impairment learning phase time and a constellation phase time, where said first modem is capable of training with said second modem over a communication channel in accordance with the V.90 modem protocol including the V.8bis capabilities exchange phase, said first modem comprising:
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a receiver section configured to receive a call from said second modem to establish said communication channel; a transmitter section configured to transmit, in response to said call, a modified V.8bis capabilities exchange phase of the V.90 modem protocol, wherein said modified V.8bis capabilities exchange phase of the V.90 modem protocol is indicative of a fast connect capability; wherein said receiver section is further configured to receive a fast connect capability identifier from said second modem in response to said fast connect capability, and wherein said transmitter section is further configured to skip at least a portion of the V.8bis capabilities exchange phase of the V.90 modem protocol to reduce said capabilities exchange phase time in response to said receiver section receiving said fast connect capability identifier. - View Dependent Claims (7, 8, 9, 10)
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Specification