H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/5
H04M 11/00 (2006.01) H04L 7/027 (2006.01) H04L 25/03 (2006.01) H04L 27/38 (2006.01) H04L 7/04 (2006.01)
Patent
CA 1246260
ABSTRACT OF THE DISCLOSURE 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 used for gain control, a timing signal used for pull-in synchronization, and at least two impulses used 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.
510739
Arai Yasuhiro
Kaku Takashi
Fujitsu Limited
Mcfadden Fincham
LandOfFree
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