Method and apparatus for providing a dial tone to a telephone wi

Details Method and apparatus for providing a dial tone to a telephone wi Method and apparatus for providing a dial tone to a telephone wi

1997-07-23

1998-08-25

Hudspeth, David R.

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

455515, 455401, H04M 1100, H04Q 700

Patent

active

057992541

ABSTRACT:
The wireless local loop system employs cellular technology to provide telephone service to fixed telephones of remote stations having otherwise conventional handsets. The remote station emulates a conventional public switched telephone network by providing an artificial dial tone from the handset of the remote station, after the handset is taken off-hook. The artificial dial tone is locally generated by the remote station. The system, however, delays providing the dial tone if the system is busy, i.e. if the system is under a load condition. To this end, the system monitors load levels and transmits signals to the remote stations indicating load conditions. A remote station, prior to granting at dial tone to the user, receives the load condition signals, determines whether the system is currently under load and, if so, defers the dial tone. Hence, if the system is under a load condition, such that no lines or frequency channels are available, the user is not presented a dial tone until a line or channel becomes available. By deferring the dial tone until a line or channel is available, the wireless local loop system more effectively emulates a PSTN.

REFERENCES:
patent: 4028500 (1977-06-01), McClure et al.
patent: 4220820 (1980-09-01), Mallien, II
patent: 4628152 (1986-12-01), Akerberg
patent: 4953198 (1990-08-01), Daly et al.
patent: 4959851 (1990-09-01), Tobolski, Jr. et al.
patent: 5237603 (1993-08-01), Yamagata et al.
patent: 5353331 (1994-10-01), Emery et al.
patent: 5594782 (1997-01-01), Zicker et al.

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