Pulse or digital communications – Repeaters – Testing
Patent
1992-01-13
1994-05-31
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375121, H04B 138, H04L 516
Patent
active
053175948
ABSTRACT:
A method for identifying a V.fast modem within already standard automatic interworking procedures are provided. The method comprises utilizing standard methods for identifying a V.32/V.32bis modem up and through the standard ranging sequence, and after ranging and during the undefined 8192 baud period before an S signal would be sent by a V.32 or V.32bis modem the answering mode modem sends a predetermined signal (VFS) which does not resemble an S signal. Simultaneous with the answer modem sending VFS, the call mode modem looks for VFS. Upon detecting VFS, the call mode modem confirms receipt by sending a confirming signal (VFC) to the answer mode modem. Upon receiving VFC, if the communicating modems are not already in a problem mode, the modems will probe the line and continue according to whatever V.fast standards will be adopted. Preferably, VFS contains at least two tones. If desired, VFS can be a spectrum, with energy in frequency bands surrounding the S tone frequencies suppressed. This way, the VFS signal can be used by the answering modem for probing the line. Similarly, the confirming signal may be one or more tones, or a spectrum of frequencies for probing.
REFERENCES:
patent: 4756007 (1988-07-01), Qureshi et al.
patent: 4931250 (1990-06-01), Greszczuk
patent: 4956851 (1990-09-01), Wolensky et al.
patent: 5148472 (1992-09-01), Hallman
Chin Stephen
General Datacomm, Inc.
Gordon David P.
Phan Hai H.
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