Pulse or digital communications – Repeaters – Testing
Patent
1986-06-04
1989-09-19
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 8, 34082508, H03H 730, H04B 138
Patent
active
048688509
ABSTRACT:
A multipoint type MODEM communication system having a training device for adapting receiving parameters in a receiving MODEM to a characteristic of a telephone line connected to a sending MODEM in response to a training signal sent from the sending MODEM prior to the reception of data. The training signal includes a tone for gain control, a timing signal for pull-in synchronization, and at least two impulses for equalization and carrier phase control, which are superimposed on each other. A time between the first and the last impulses defines the characteristic of the telephone line which should be adjusted in the receiving MODEM.
Additional guard impulses may be added prior to and/or after the impulses. A scramble signal also may be added after the impulses.
In addition, a method for training the receiving MODEM is disclosed.
REFERENCES:
patent: 2861257 (1958-11-01), Weintraub
patent: 3962637 (1976-06-01), Motley et al.
patent: 4238849 (1980-12-01), Gassmann
patent: 4462108 (1984-07-01), Miller
patent: 4571733 (1986-02-01), Kaku et al.
patent: 4577328 (1986-03-01), Senoo
patent: 4597089 (1986-06-01), Motley et al.
patent: 4638496 (1987-01-01), Jensen
Arai Yasuhiro
Kaku Takashi
Fujitsu Limited
Griffin Robert L.
Telesz Jr. Andrew J.
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