TELCO-less CT-2 base

• US 5,629,976 A
• Filed: 01/23/1995
• Issued: 05/13/1997
• Est. Priority Date: 01/23/1995
• Status: Expired due to Fees

• Current Assignee: Chee T. Tai, Wai S. Loke
• Original Assignee: Chee T. Tai, Wai S. Loke
• Inventors: Loke, Wai S., Tai, Chee T.
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): Maung, Nay Aung
• Application Number:
  US08/376,984
• Time in Patent Office: 841 Days
• Field of Search: 379/58, 379/59, 379/61
• US Class Current: 370/280
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A converter incorporates all the elements of a conventional base station, except for the integral TELCO interface. A separate TELCO interface (140) is made accessible to the converter (120) through a telephone port (424) which is connected to a conventional telephone base (240).

Claims

1. A CT-2 base telephone converter comprising:

a CT-2 transceiver for receiving a modulated RF signal and for demodulating the signal to produce CT-2 packets;

a time division duplexer for splitting the packets into signalling bits and a compressed ADPCM digital signal;

a controller for receiving the signalling bits from the time division duplexer, reading the signalling bits, and performing associated conventional signalling functions in response thereto;

an ADPCM transcoder for receiving the compressed ADPCM digital signal from the time division duplexer and decompressing the ADPCM digital signal to form a digital signal;

a PCM codec for receiving the digital signal for decoding the digital signal into an analog telephone signal;

a telephone port having a pair of tip and ring lines for connecting the tip and ring lines to a separate telephone base having a TELCO interface; and

a PCM codec port for coupling the analog telephone signal to a wired handset port of the separate telephone base having internal connections to the TELCO interface, wherein the analog telephone signal is coupled via the TELCO interface and the tip and ring lines of the telephone port to a PSTN.

2. The CT-2 base telephone converter for claim 1, further comprising a tip and ring interceptor for controlling the operation of the tip and ring lines.

3. The CT-2 converter of claim 2, wherein the tip and ring interceptor comprises a ring detector.

4. A CT-2 base telephone converter comprising:

a CT-2 transceiver for receiving a modulated RF signal and for demodulating the signal to produce CT-2 packets;

a time division duplexer for splitting the packets into signalling bits and a compressed ADPCM digital signal;

a controller for receiving the signalling bits from the time division duplexer, reading the signalling bits, and performing associated conventional signalling functions in response thereto;

an ADPCM transcoder for receiving the compressed ADPCM digital signal from the controller and decompressing the ADPCM digital signal to form a digital signal;

a PCM codec for receiving the digital signal for decoding the digital signal into an analog telephone signal;

a telephone port having a pair of tip and ring lines for connecting the tip and ring lines to a TELCO port of a separate telephone base having a TELCO interface; and

a PCM codec port for coupling the analog telephone signal to a corded handset port of the telephone base, the telephone base having internal circuitry for coupling the corded handset port to the TELCO interface; and

a tip and ring interceptor for controlling the operation of the tip and ring lines in response to an OFF-hook representation, wherein the analog telephone signal is coupled via the TELCO interface, the tip and ring lines of the telephone port and the tip and ring interceptor to a PSTN.

5. The CT-2 converter of claim 4, wherein the tip and ring interceptor comprises:

a ring-detect and hook relay phone circuitry controlled by the controller in response to an OFF-hook electrical signal from a wireless CT-2 handset.

6. The CT-2 converter of claim 4, wherein the tip and ring interceptor comprises:

an external hookswitch for cradling the corded handset and for providing an OFF-hook signal to the controller;

a ring-detect and hook relay phone circuitry controlled by the controller in response to the OFF-hook signal from the external hookswitch.

7. The CT-2 converter of claim 4, wherein the PCM codec port comprises parallel audio and receive lines for coupling the analog telephone signals to both the corded handset and to the corded handset port.