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US 6,185,297 B2Granted
Low power dialer
AssigneeMitel Corporation
InventorsPatrick H. Casselman, Marshall W. Pharoah, Valentin Purits, Neal Rudolph, John R. Zabel
Life of this patent
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AssigneeMitel Corporation
InventorsPatrick H. Casselman, Marshall W. Pharoah, Valentin Purits, Neal Rudolph, John R. Zabel
Estimating the term…
A telephone dialer for connection to a public switched telephone network (PSTN) and to a station apparatus, for receiving digits dialed from the station apparatus and for adding digits or substituting digits for the dialed digits and for redialing digits to the PSTN wherein the redialed digits are comprised of the dialed and added digits or comprised of substituted digits, the dialer further comprising an adjustable hold circuit for connection to the PSTN during an interval when the redialed digits are being output, for holding a line associated with the PSTN in an offhook condition, the adjustable hold circuit having a load connectable to the PSTN line which is variable with PSTN line voltage at the dialer such as to draw a variable current sufficient to meet predetermined current and voltage criteria of the line at the dialer.
A telephone dialer for connection between a public switched telephone network (PSTN) and a station apparatus comprising,
A telephone dialer for splitting a line between a public switched telephone network (PSTN) and a station apparatus location, comprising a circuit for generating subscriber line voltage and current from power supplied by the PSTN on said line and for applying said voltage and current to the line to the station apparatus location following the split, and a warning circuit for detecting voltage across a PSTN line and voltage across the line to which the station apparatus may be connected, and for providing a first signal in the event the difference in the voltages is greater than a predetermined value as an indicator that an auxiliary local power supply is not required.
A telephone dialer as defined in claim a including a controller circuit connected to receive operating current from the line to the PSTN, (the controller circuit drawing current which is less than a predetermined line leakage current which is less than that required to seize or hold said lined) the controller for automatically controlling dialing of a predetermined directory number over a PSTN line at a predetermined time, and for receiving from a dialed location via the PSTN line and storing, data representing at least one of programs and data for further operation of the telephone dialer.
Dependencies are inferred from the claim text.