← Back to Patent Explorer
EP0169548A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method and apparatus for automatically identifying a responding modem in a multi-drop network

Assignee: Universal Data Systems Inc
•
Filing: 1985-07-23
•
Granted: —
•
Expires: 2005-07-23
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A high-speed communication system having one master and several remote modems, wherein each remote modem is identified to the master modem by an encoded identification signal. The receipt of the remote modem identification signals by the master modem permits rapid establishment in the master modem of system operating parameters unique to each respective remote modem. The parameters of modems in the system of the present invention include equalizer coefficients and receiver parameters acquired during the first transmission between the master modem and each respective remote modem. The parameters and coefficients acquired by the master modem are then stored in the master modem for the particular remote modem according to remote modem as identified by the encoded identification signal within or after the equalizer training sequence signal transmitted by the remote modem. For subsequent transmissions, the particular remote modem is identified by an encoded identification signal comprising a unique signal sequence which is transmitted during a time inerval reserved for modem identification prior to transmission of data, and the training sequence is thereafter significantly shortened or in part eliminated. Thereafter, previously acquired equalizer and receiver parameters for the corresponding identified modem being restored, and the data transfer can rapidly commence without invoking an extended training period for each transmission. The master modem, according to the received identification signal, selects the corresponding parameters stored for the particular remote modem, are restored, and the master modem receiver is rapidly adjusted.

Inventors

  • 👤 Richard A. Burch
  • 👤 Roger W. Cain

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-25 07:48
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40169; H04L12/403; H04L27/00

Claims Analysis

Total Claims: 16
Claim 1
Independent Claim 45 words
A multi-drop network, a method of automatic identification comprising the steps of: selecting a first training segment; receiving said first segment; establishing a carrier frequency; sending a first identification segment; receiving said first identification segment; receiving said first identification segment; sending data; and receiving data.
Claim 2
Dependent Claim 45 words
A multi-drop network, a method of automatic identification comprising the steps of: selecting a first training segment; receiving said first segment; establishing a carrier frequency; sending a first identification segment; receiving said first identification segment; receiving said first identification segment; sending data; and receiving data.
Claim 3
Dependent Claim 17 words
The method of claim 1, further including sending a second identification; and receiving a second identification code.
Claim 4
Dependent Claim 20 words
The method of claim 2, further including sending a second timing segment signal; and receiving the second timing segment signal
Claim 5
Dependent Claim 69 words
In a multi-drop network, a method of automatic identification comprising the steps of: transmitting a first and second segment; receiving said first and second timing segment; receiving a first identification signal; transmitting a second identification signal after a duration corresponding to the station identification; receiving said first and second identification signals; detecting the duration between the first and second identification signals; and determining the identification according to said duration.
Claim 6
Dependent Claim 69 words
In a multi-drop network, a method of automatic identification comprising the steps of: transmitting a first and second segment; receiving said first and second timing segment; receiving a first identification signal; transmitting a second identification signal after a duration corresponding to the station identification; receiving said first and second identification signals; detecting the duration between the first and second identification signals; and determining the identification according to said duration.
Claim 7
Dependent Claim 49 words
In a multi-drop network, a method of identifying the remote modems to the master modem, comprising the steps of: transmitting a first and second timing segment; transmitting a first identification signal; and transmitting a second identification signal after a duration of time corresponding to the remote modem identification number.
Claim 8
Dependent Claim 49 words
In a multi-drop network, a method of identifying the remote modems to the master modem, comprising the steps of: transmitting a first and second timing segment; transmitting a first identification signal; and transmitting a second identification signal after a duration of time corresponding to the remote modem identification number.
Claim 9
Dependent Claim 71 words
In a multi-drop network, a method of identifying a remote modem to the master modem, comprising the steps of: receiving a first and second timing segment; - receiving a first and second identification signal; detecting the beginning of each of said first and second identification signals; and determining the identification number according to the duration of time between the onset of the first and the onset of the second identification signals.
Claim 10
Dependent Claim 71 words
In a multi-drop network, a method of identifying a remote modem to the master modem, comprising the steps of: receiving a first and second timing segment; - receiving a first and second identification signal; detecting the beginning of each of said first and second identification signals; and determining the identification number according to the duration of time between the onset of the first and the onset of the second identification signals.
Claim 11
Dependent Claim 45 words
In a multi-drop network, a method of identifying a remote modem to the master modem, comprising the steps of: transmitting a first training segment; transmitting a first identification tone signal having a tone frequency corresponding to the identification number; and transmitting a second tone signal
Claim 12
Dependent Claim 45 words
In a multi-drop network, a method of identifying a remote modem to the master modem, comprising the steps of: transmitting a first training segment; transmitting a first identification tone signal having a tone frequency corresponding to the identification number; and transmitting a second tone signal
Claim 13
Dependent Claim 55 words
In a multi-drop network, a method of identifying a remote modem to the master modem, comprising the steps of: receiving a first tone signal; receiving a first identification tone; detecting the frequency of the first identification tone; determining the identification number according to the frequency of the identification tone; and receiving a second tone signal
Claim 14
Dependent Claim 55 words
In a multi-drop network, a method of identifying a remote modem to the master modem, comprising the steps of: receiving a first tone signal; receiving a first identification tone; detecting the frequency of the first identification tone; determining the identification number according to the frequency of the identification tone; and receiving a second tone signal
Claim 15
Dependent Claim 45 words
r, a multi-drop network having quadrature phase-shift keying data signal transmission, a modem apparatus comprising: tone decoder means providing a signal corresponding to the frequency of the received signal; and demodulator means receiving the quadrature phase-shift keying data signal and the tone decoder output signal.
Claim 16
Dependent Claim 45 words
r, a multi-drop network having quadrature phase-shift keying data signal transmission, a modem apparatus comprising: tone decoder means providing a signal corresponding to the frequency of the received signal; and demodulator means receiving the quadrature phase-shift keying data signal and the tone decoder output signal.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag