Passive telephone line monitoring system
First Claim
1. A telephone line activity, both incoming and outgoing calls, passive monitoring system comprising:
- microcomputer means;
read only memory (ROM) means mounted with said microcomputer means circuit connected for control by an on-board program contained in said ROM;
random access memory (RAM) means in said system;
circuit means interconnecting said RAM means and said microcomputer means;
said on-board program carrying ROM having the capacity to work with at least 16K bytes of said random access memory (RAM) divided into at least 16 byte caches allowing for up to at least 500 phone call registers depending upon utilization of available space;
phone line to microcomputer signal input means;
display means;
clock means;
keyboard entry means; and
said clock means including a clock source feeding said display means;
wherein said phone line to microcomputer signal input means includes, on/off hook detecting means;
ring detect means, and answer detect means; and
circuit means interconnecting said on/off hook detecting means, said ring detect means, and answer detect means and said microcomputer means;
said phone line to microcomputer signal input means also includes, a dual tone multi-frequency (DTMF) circuit that decodes dual tones from said phone line to generate binary equivalent numbers as data to said microcomputer and that is an interrupting signal source to said microcomputer circuit means;
said circuit means includes an address/data buss system, and a read/write interrupt drive interconnect line, both connected to said on/off hook detecting means, said ring detect means, said answer detect means, and said DTMF circuit;
said phone line to microcomputer signal input means also includes, a call number decoder (CND) call ID circuit; and
connection of said CND call ID circuit to said address/data buss system, and to said read/write interrupt drive interconnect line.
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Accused Products
Abstract
A passive telephone line monitor is provided for keeping a log of telephone line activity, both incoming and outgoing, with a microcomputer (MCU) controlled by an onboard program read only memory (ROM) working with 64K bytes of random access memory (RAM) divided into 32 byte caches allowing for up to 2,000 phone call registers depending upon utilization of available space. One hundred Alpha Directory numbers can be stored from its keyboard for personalized caller identification. Upon power application, memory, input devices and registers are initialized, and time and date are entered from the monitor keypad. The microcomputer, an interrupt controlled device, detects monitor keyboard interrupt and displays the data on a liquid crystal display, and upon completion of date and time entry, the MCU clears all interrupt flags and displays current date and clock.
48 Citations
15 Claims
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1. A telephone line activity, both incoming and outgoing calls, passive monitoring system comprising:
- microcomputer means;
read only memory (ROM) means mounted with said microcomputer means circuit connected for control by an on-board program contained in said ROM;
random access memory (RAM) means in said system;
circuit means interconnecting said RAM means and said microcomputer means;
said on-board program carrying ROM having the capacity to work with at least 16K bytes of said random access memory (RAM) divided into at least 16 byte caches allowing for up to at least 500 phone call registers depending upon utilization of available space;
phone line to microcomputer signal input means;
display means;
clock means;
keyboard entry means; and
said clock means including a clock source feeding said display means;
wherein said phone line to microcomputer signal input means includes, on/off hook detecting means;
ring detect means, and answer detect means; and
circuit means interconnecting said on/off hook detecting means, said ring detect means, and answer detect means and said microcomputer means;
said phone line to microcomputer signal input means also includes, a dual tone multi-frequency (DTMF) circuit that decodes dual tones from said phone line to generate binary equivalent numbers as data to said microcomputer and that is an interrupting signal source to said microcomputer circuit means;
said circuit means includes an address/data buss system, and a read/write interrupt drive interconnect line, both connected to said on/off hook detecting means, said ring detect means, said answer detect means, and said DTMF circuit;
said phone line to microcomputer signal input means also includes, a call number decoder (CND) call ID circuit; and
connection of said CND call ID circuit to said address/data buss system, and to said read/write interrupt drive interconnect line. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- microcomputer means;
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8. A telephone line activity, both incoming and outgoing calls, passive monitoring system comprising:
- microcomputer means;
read only memory (ROM) means mounted with said microcomputer means circuit connected for control by an on-board program contained in said ROM;
random access memory (RAM) means in said system;
circuit means interconnecting said RAM means and said microcomputer means;
said on-board program carrying ROM having the capacity to work with at least 16K bytes of said random access memory (RAM) divided into at least 16 byte caches allowing for up to at least 500 phone call registers depending upon utilization of available space;
phone line to microcomputer signal input means;
display means;
clock means;
keyboard entry means; and
said clock means including a clock source feeding said display means;
wherein said phone line to microcomputer signal input means includes, on/off hook detecting means;
ring detect means, and answer detect means; and
circuit means interconnecting said on/off hook detecting means, said ring detect means, and answer detect means and said microcomputer means; and
said phone line to microcomputer signal input means also includes a call number decoder (CND) call ID circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
- microcomputer means;
Specification