Faster modem method and apparatus
View Patent ↗A faster modem apparatus communicates with customer premise equipment according to a variety of communication protocols. The faster modem apparatus communicates with customer premise equipment comprising an analog soft-modem comprising a codec. A method utilizes an unused portion of the codec operating range to code and decode data signals having frequencies above 4 kHz. The faster modem apparatus also codes and decodes data signals above 4 kHz. The analog soft-modem and the faster modem apparatus transmit and receive coded analog signals at a signal level of greater than −9 dBm. In one embodiment, the faster modem apparatus is also operative to communicate with additional modems such as dial-up modems and DSL modems. In one embodiment, the faster modem apparatus supports simultaneous voice and data communications.
1. A faster modem apparatus comprising:
a subscriber line port;
a central office line port;
a first low pass filter connected to said subscriber line port and said central office line port;
isolation circuitry connected to said subscriber line port;
a switch connected to said isolation circuitry, said switch comprising a switch control line;
a line driver connected to said switch and said isolation circuitry;
an analog front end connected to said line driver;
a hybrid unit connected to said switch and said analog front end, wherein said hybrid unit comprises a first hybrid adapted to receive high frequency signals and a second hybrid adapted to receive low frequency signals, and wherein one of the first and second hybrids is selectively connected between the isolation circuitry and the analog front end via said switch;
a digital signal processor in communication with said analog front end, said digital signal processor comprising a microprocessor interface.
2. The invention of claim 1 wherein said first hybrid comprises a DSL hybrid and a high pass filter.
3. The invention of claim 2 wherein said DSL hybrid is an ADSL hybrid.
4. The invention of claim 2 wherein said high pass filter is a 20 kHz high pass filter.
5. The invention of claim 1 wherein said second hybrid comprises an analog modem hybrid and a second low pass filter.
6. The invention of claim 5 wherein said second low pass filter is a 20 kHz low pass filter.
7. The invention of claim 1 wherein said first low pass filter is an 81 ci-lz low pass filter.
8. The invention of claim 1 wherein said isolation circuitry is a 1:1 transformer.
9. The invention of claim 8 wherein said transformer has an insertion loss of less than 3 dB.
10. The invention of claim 1 wherein said switch is a double-pole-double-throw relay.
11. The invention of claim 1 wherein said line driver comprises a line driver control line, and wherein the line driver is operative to be switched on and off by said line driver control line.
12. The invention of claim 1 further comprising a compression engine in communication with said digital signal processor, and wherein said compression engine is a V.42/V.42bis compression engine.
13. The invention of claim 1 wherein said analog front end is operative to code and decode signals above 4 KHz in frequency.