Method and apparatus for fast V.90 modem startup
First Claim
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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:
- 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 acknowledgement from said second modem in response to said fast connect capability;
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 acknowledgement;
determining whether a characteristic of said communication channel is similar to a corresponding characteristic associated with a previously established communication channels; and
using one or more stored parameters to reduce said training time for establishing said communication channel, wherein said one or more stored parameters are associated with one or more previously established communication channels.
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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.
50 Citations
25 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 acknowledgement from said second modem in response to said fast connect capability;
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 acknowledgement;
determining whether a characteristic of said communication channel is similar to a corresponding characteristic associated with a previously established communication channels; and
using one or more stored parameters to reduce said training time for establishing said communication channel, wherein said one or more stored parameters are associated with one or more previously established communication channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
receiving a signal point sequence from said second modem; and
comparing attributes of said signal point sequence with stored attributes of a previously received sequence associated with said previously established communication channel.
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3. A method according to claim 2, wherein said signal point sequence comprises a sequence of pulse code modulation signal points.
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4. A method according to claim 2, wherein said signal point sequence is predetermined and known at said first modem and at said second modem.
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5. A method according to claim 1 further comprising the step of initializing at least one of said first and second modems in response to a number of stored parameters associated with said previously established communication channel, wherein:
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at least a portion of said initializing step is performed at an initial data rate; and
said method further comprises the step of entering a data mode at a full data rate, said entering step being performed after said initializing step.
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6. A method according to claim 1, further comprising the step of identifying at least one signal point for use by said first modem in a transition sequence, said at least one signal point being capable of highlighting the presence of digital impairments in said communication channel.
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7. A method according to claim 1, further comprising the steps of:
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conducting final training of at least one of said first and second modems during a time period, said conducting step being performed after said determining step; and
exchanging authentication information between said first and second modems during said time period.
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8. A method according to claim 7, wherein said exchanging step is performed in accordance with the Password Authentication Protocol (“
- PAP”
) or in accordance with the Challenge Handshake Authentication Protocol (“
CHAP”
).
- PAP”
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9. The method of claim 1 further comprising the step of:
- skipping at least a portion of a digital impairment phase of the V.90 modem protocol if said determining step determines that said previous characteristic is similar to said corresponding characteristic of said communication characteristic.
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10. 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 is further configured to receive a fast connect capability acknowledgement from said second modem in response to said fast connect capability, and wherein said transmitter 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 receiving said fast connect capability acknowledgement;
a memory element configured to store a previous channel characteristic associated with a previously established communication channel; and
a processor element configured to determine whether said previous channel characteristic of said previously established communication channel is similar to a corresponding channel characteristic of said communication channel, said processor being further configured to use one or more stored parameters to reduce said training time for establishing said communication channel in response to a determination that said previous channel characteristic is similar to said corresponding channel characteristic of said communication channel. - View Dependent Claims (11, 12, 13, 14, 15, 16)
said receiver section is configured to obtain a received sequence related to a signal point sequence transmitted by said second modem; and
said processor element is configured to compare attributes of said received sequence with stored attributes of a previously received sequence associated with said previously established communication channel.
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12. A first modem according to claim 10, wherein said transmitter is further configured to transmit a signal point identifier that identifies at least one signal point for use by said second modem in a transition sequence, said at least one signal point being capable of highlighting the presence of digital impairments in said current communication channel.
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13. A first modem according to claim 10, wherein said processor element is further configured to train said receiver section at an initial data rate and to exchange authentication information with said second modem during a first time period, wherein an exchange of authentication information with said second modem occurs if said processor element determines that said previous channel characteristic is similar to said corresponding channel characteristic of said communication channel.
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14. A first modem according to claim 13, wherein said exchange of authentication information is performed in accordance with the Password Authentication Protocol (“
- PAP”
) or in accordance with the Challenge Handshake Authentication Protocol (“
CHAP”
).
- PAP”
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15. A first modem according to claim 13, wherein:
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said receiver section is trained in response to scrambled digital data transmitted by said second modem; and
said authentication information is associated with said scrambled digital data.
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16. The first modem of claim 10, wherein said processor is further configured to skip at least a portion of a digital impairment phase of the V.90 modem protocol if said previous channel characteristic is similar to said second channel characteristic of said communication characteristic.
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17. A computer readable medium including a computer software product executable by a processor in a first modem 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 computer software product comprising:
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code for receiving a call from said second modem to establish said communication channel;
code for 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;
code for receiving a fast connect capability acknowledgement from said second modem in response to said fast connect capability;
code for 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 code for skipping being performed in response to said receiving said fast connect capability acknowledgement;
code for determining whether a characteristic of said communication channel is similar to a corresponding characteristic associated with a previously established communication channel; and
code for using one or more stored parameters to reduce said training time for establishing said communication channel, wherein said one or more stored parameters are associated with one or more previously established communication channels. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
code for receiving a signal point sequence from said second modem; and
code for comparing attributes of said signal point sequence with stored attributes of a previously received sequence associated with said previously established communication channel.
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19. The computer readable medium according to claim 18, wherein said signal point sequence comprises a sequence of pulse code modulation signal points.
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20. The computer readable medium according to claim 18, wherein said signal point sequence is predetermined and known at said first modem and at said second modem.
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21. The computer readable medium according to claim 17, wherein said computer software product further comprising code of initializing at least one of said first and second modems in response to a number of stored parameters associated with said previously established communication channel, wherein:
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at least a portion of said code for initializing is performed at an initial data rate; and
said computer software product further comprises code of entering a data mode at a full data rate, said code of entering being performed after said code for initializing.
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22. The computer readable medium according to claim 17, wherein said computer software product further comprising code for identifying at least one signal point for use by said first modem in a transition sequence, said at least one signal point being capable of highlighting the presence of digital impairments in said communication channel.
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23. The computer readable medium according to claim 17, wherein said computer software product comprising:
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code for conducting final training of at least one of said first and second modems during a time period, said code for conducting being performed after said code for determining; and
code for exchanging authentication information between said first and second modems during said time period.
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24. The computer readable medium according to claim 23, wherein said code for exchanging is performed in accordance with the Password Authentication Protocol (“
- PAP”
) or in accordance with the Challenge Handshake Authentication Protocol (“
CHAP”
).
- PAP”
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25. The computer readable medium according to claim 17, wherein said computer software product comprising code for skipping at least a portion of a digital impairment phase of the V.90 modem protocol if said code for determining determines that said previous characteristic is similar to said corresponding characteristic of said communication channel.
Specification
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Current AssigneeModern Telecom Systems, LLC (Ideahub, Inc.)
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Original AssigneeMindspeed Technologies Inc. (MACOM Technology Solutions Holdings, Inc.)
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InventorsBeadle, Burk, Chu, Keith, Olafsson, Sverrir
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Primary Examiner(s)Eng, George
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Application NumberUS09/361,842Time in Patent Office1,939 DaysField of Search379/93.01, 379/93.05, 379/93.06, 379/93-8-, 379/93.35, 379/100.17, 375/220, 375/222, 375/231, 370/252US Class Current379/93.32CPC Class CodesH04L 25/4902 Pulse width modulation; Pul...H04L 27/02 Amplitude-modulated carrier...H04L 5/1438 Negotiation of transmission...H04L 69/24 Negotiation of communicatio...H04L 9/40 Network security protocolsH04M 11/00 Telephonic communication sy...H04M 11/06 Simultaneous speech and dat...H04M 11/066 Telephone sets adapted for ...
