Method and apparatus for fast V.90 modem startup

• US 7,277,531 B2
• Filed: 08/16/2005
• Issued: 10/02/2007
• Est. Priority Date: 04/12/1999
• Status: Expired

• Current Assignee: V-Dot Technologies LLC
• Original Assignee: Mindspeed Technologies Inc. (MACOM Technology Solutions Holdings, Inc.)
• Inventors: Chu, Keith, Beadle, Burk, Olafsson, Sverrir
• Primary Examiner(s): Ramakrishnaiah, Melur
• Application Number:
  US11/205,896
• Publication Number:
  US 20060002530A1
• Time in Patent Office: 777 Days
• Field of Search: 379/93.32, 379/93.01, 379/93.05, 379/93.06, 379/93.28, 379/93.29, 379/93.31, 379/93.33, 379/93.35, 379/100.17, 375/222, 375/231, 370/252
• US Class Current: 379/93.32
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 11/00 Telephonic communication systems specially adapted for combination with other electrical systems
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
• CPC Class Codes: H04M 11/066 Telephone sets adapted for data transmision

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.

Claims

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.

2. The method of claim 1 further comprising the step of transmitting an acknowledgment in response to said fast connect capability identifier.

3. The method of claim 2 further comprising the step of obtaining points for a transition sequence after said step of transmitting said acknowledgment.

4. The method of claim 3 further comprising the step of transmitting said transition sequence after said step of obtaining said points.

5. The method of claim 4 further comprising the step of transmitting an ANSpcm after said step of transmitting said transition sequence.

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:

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.

7. The first modem of claim 6, wherein said transmitter section is further configured to transmit an acknowledgment in response to said fast connect capability identifier.

8. The first modem of claim 7, wherein said first modem obtains points for a transition sequence after transmitting said acknowledgment.

9. The first modem of claim 8, wherein said transmitter section is further configured to transmit said transition sequence.

10. The first modem of claim 9, wherein said transmitter section is further configured to transmit an ANSpcm after transmitting said transition sequence.