发明名称 |
FREQUENCY AGILE BROADBAND COMMUNICATIONS SYSTEM |
摘要 |
A broadband communications system for coupling telephony (10) or other digital networks to a CATV network (12). The system transmits a multiplex of telephony signals in the forward band of the CATV network. Each forward channel is QPR modulated on a carrier and contains multiple subscriber telephony signals. The forward telephony channels are demodulated and multiplexed by a plurality of subscriber terminals into the individual telephony signals directed to an addressed subscriber. Audio and control signals returning from the subscriber are digitized into standard telephony signals and QPSK modulated on a carrier onto the reverse band of the CATV network. The multiplicity of reverse band telephony channels are demodulated and multiplexed into a standard telephony signal which is directly interfaced to the telephony network. The reverse band modulators are frequency agile and modulate telephony signals from a subscriber in a selected one or more frequency subbands in the reverse band of the subscription network.
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申请公布号 |
WO9527350(A1) |
申请公布日期 |
1995.10.12 |
申请号 |
WO1995US03900 |
申请日期 |
1995.03.28 |
申请人 |
SCIENTIFIC-ATLANTA, INC. |
发明人 |
THOMPSON, LEO, J.;RITCHIE, JOHN, ALEXANDER, JR.;DUBBERLY, GREGORY, THOMAS |
分类号 |
H04J1/00;H04H20/79;H04H20/81;H04H60/96;H04H60/97;H04J1/12;H04J3/16;H04L12/28;H04L12/413;H04M3/00;H04M7/00;H04N7/10;H04N7/173;H04Q11/04;(IPC1-7):H04J1/00;H04N7/14;H04N7/16 |
主分类号 |
H04J1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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