Apparatus and method of implementing a home network by filtering ISDN-based signals within the customer premises
AssigneeAdvanced Micro Devices, Inc.
InventorBernd Willer
Life of this patent
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Abstract
An arrangement for implementing a network in an ISDN-BASED customer premises having a 4-wire ISDN S0 bus. The ISDN-BASED customer premises includes a Network Termination Basic Access (NTBA) that interfaces between the residential customer premises and the public switched telephone network by mapping the 2-wire ISDN signal onto the 4-wire bus. A low pass filter is added to the 2-wire send path to eliminate high frequency noise caused by harmonic reflections of the ISDN-based signals on the 4-wire bus. The filter also provides a delay between the zero crossing of the ISDN-based signals and the transmitted network signals, minimizing the effect of the ISDN zero crossings on the home network signal.
Claims15
A method of implementing a local area network in a home telephone network having a network termination basic access (NTBA) device, configured for sending and receiving ISDN-based signals to and from a public switched telephone network;
- and a four-wire bus including a two-wire send path and a two-wire receive path for sending and receiving the ISDN-baaed signals, respectively, between the NTBA device and taps along the four-wire bus, the method comprising:
- connecting a law pass filter, configured for passing the ISDN-based signals and rejecting harmonies thereof, between the two wires of the two-wire send path;
- and
- transmitting network data signals, having frequencies substantially higher than the ISDN-based signals between the taps.
A computer network comprising:
- a network termination basic access (NTBA) device, configured for sending and receiving ISDN-based signals to and from a public switched telephone network;
- a four-wire bus having a two-wire send path and a two-wire receive path for sending and receiving the ISDN-based signals between the NTBA device and ISDN customer premises equipment;
- first and second end stations configured for exchanging network data signals having frequencies substantially higher than the ISDN-based signals, via at least one of the two-wire send path and the two-wire receive path;
- and
- a low pass filter, coupled to the two-wire send path, for passing the ISDN-based signals and filtering harmonic signals of the ISDN-based signals substantially at the frequencies of the network data signals, the low pass filter enabling transmission of the network data signals via the at least one of the two-wire send path and the two-wire receive path.
Dependencies are inferred from the claim text.