Solid-state modem control

Claim 2

A modem control for use with a computer interface, a CBS coupler, a data set receiver and a data set transmitter, said control comprising: first and second timers each having first, second and third input leads, a set input lead, a reset input lead and first and second output leads; first and second reference potentials, said first and said second signal input leads of said first timer being connected to said second potential, said third signal input lead and said reset input lead of said first timer each being coupled to said receiver, said first output lead of said first timer being coupled to said second input lead of said second timer and to said interface, said first output lead of said first timer being connected to said reset input lead of said second timer, said third signal input lead of said second timer being coupled to said first potential; and first gating means having an output lead and first, second and third input leads, said output lead of said first gating means being connected to said transmitter, first input lead of said first gating means being coupled to said first output lead of said second timer, said second input lead of said first gating means being coupled to said second output lead of said second timer, said third input lead of said first gating means being coupled to said interface.

Claim 3

A modem control as defined in claim 1 wherein each of said timers includes: a retriggerable one-shot having first, second and third input leads and an output lead, each of said input leads of said one-shot being connected to a corresponding one of said signal input leads of said timer; a timing circuit, said timing circuit being connected to said one-shot; and a master-slave flip-flop having a signal input lead, a set lead, a reset lead and first and second output leads, said input lead of said flip-flop being connected to said output lead of said one-shot, said first and said second output leads of said flip-flop each being connected to a corresponding one of said output leads of said timer, said set lead of said flip-flop being connected to said set input lead of said timer, said reset lead of said flip-flop being connected to said reset input lead of said timer.

Claim 4

A modem control as defined in claim 1 including: a fourth timer having first, second and third signal input leads, a set input lead, a reset input lead and first and second output leads; means for coupling said first and said second input leads of said fourth timer to said interface and to said coupler, said third input lead of said fourth timer being connected to said interface; and means for coupling said set input lead of said fourth timer to said first output lead of said second timer and to said interface, said first output lead of said fourth timer being connected to said coupler.

Claim 5

A modem control for use with a computer interface, a CBS coupler, a data set receiver and a data set transmitter, said control comprising: first, second and third timers each having first and second input leads, a said input lead, a reset input lead and first and second output leads; first and second reference potentials; said first and said second signal input leads of said first timer being connected to said first potential, said third signal lead and said reset input lead of said first timer each being coupled to said receiver, said first output lead of said first timer being coupled to said third signal input lead of said third timer and to said set input lead of said third timer, said first output leads of said first and said second timers each being coupled to said interface, said first and said second signal input leads of said third timer each being connected to said interface; means for coupling said second signal input lead of said second timer of said interface and to said first output lead of said first timer, said first output lead of said third timer being connected to said first signal input lead of said second timer, said third signal input lead of said second timer being coupled to said first potential, said reset input lead of said second timer being connected to said first output lead of said first timer; and first gating means having an output lead and a plurality of input leads, said output lead of said first gating means being connected to said transmitter, said input leads of said first gating means being coupled to said first interface and to said first and said second output leads of said secOnd timer.

Claim 6

A modem control for use with a computer interface, a CBS coupler, a data set receiver and a data set transmitter, said control comprising: first, second and third timers each having first and second input leads, a said input lead, a reset input lead and first and second output leads; first and second reference potentials; said first and said second signal input leads of said first timer being connected to said first potential, said third signal lead and said reset input lead of said first timer each being coupled to said receiver, said first output lead of said first timer being coupled to said third signal input lead of said third timer and to said set input lead of said third timer, said first output leads of said first and said second timers each being coupled to said interface, said first and said second signal input leads of said third timer each being connected to said interface; means for coupling said second signal input lead of said second timer of said interface and to said first output lead of said first timer, said first output lead of said third timer being connected to said first signal input lead of said second timer, said third signal input lead of said second timer being coupled to said first potential, said reset input lead of said second timer being connected to said first output lead of said first timer; and first gating means having an output lead and a plurality of input leads, said output lead of said first gating means being connected to said transmitter, said input leads of said first gating means being coupled to said first interface and to said first and said second output leads of said secOnd timer.

Claim 7

A modem control for use with a computer interface, a CBS coupler, a data set receiver and a data set transmitter, said control comprising: first, second, third and fourth timers each having first, second and third signal input leads, a set input lead, a reset input lead and first and second output leads; first and second reference potentials, said first and said second signal input leads of said first timer being connected to said second potential, said third signal input lead and said reset input lead of said first timer each being coupled to said receiver, said first output lead of said first timer being coupled to said third signal input lead of said third timer and to said input lead of said third timer, said first output leads of said first and said second timers each being coupled to said interface, said first and said second signal input leads of said third timer each being connected to said interface; means for coupling said second signal input of said second timer to said interface and to said first output lead of said first timer, said first output lead of said third timer being connected to said first signal input lead of said second timer, said third signal input lead of said second timer being coupled to said first potential, said reset input lead of said second timer being connected to said first output lead of said first timer; means for coupling said first and said second signal input leads of said fourth timer to said interface and to said coupler, said third signal input lead of said fourth timer being connected to said interface; means for coupling said set input lead of said fourth timer to said first output lead of said second timer and to said interface; and first gating means having an output lead and a plurality of input leads, said output lead of said first gating means being connected to said transmitter, said input leads of said first gating means being coupled to said interface and to said first and said second output leads of said second timer, said first output lead of said fourth timer being connected to said coupler.

Claim 8

A modem control for use with a computer interface, a CBS coupler, a data set receiver and a data set transmitter, said control comprising: first, second, third and fourth timers each having first, second and third signal input leads, a set input lead, a reset input lead and first and second output leads; first and second reference potentials, said first and said second signal input leads of said first timer being connected to said second potential, said third signal input lead and said reset input lead of said first timer each being coupled to said receiver, said first output lead of said first timer being coupled to said third signal input lead of said third timer and to said input lead of said third timer, said first output leads of said first and said second timers each being coupled to said interface, said first and said second signal input leads of said third timer each being connected to said interface; means for coupling said second signal input of said second timer to said interface and to said first output lead of said first timer, said first output lead of said third timer being connected to said first signal input lead of said second timer, said third signal input lead of said second timer being coupled to said first potential, said reset input lead of said second timer being connected to said first output lead of said first timer; means for coupling said first and said second signal input leads of said fourth timer to said interface and to said coupler, said third signal input lead of said fourth timer being connected to said interface; means for coupling said set input lead of said fourth timer to said first output lead of said second timer and to said interface; and first gating means having an output lead and a plurality of input leads, said output lead of said first gating means being connected to said transmitter, said input leads of said first gating means being coupled to said interface and to said first and said second output leads of said second timer, said first output lead of said fourth timer being connected to said coupler.

Claim 9

A modem control as defined in claim 5 wherein each of said timers includes: a retriggerable one-shot having first, second and third input leads and an output lead, each of said input leads of said one-shot being connected to a corresponding one of said signal input leads of said timer; a timing circuit, said timing circuit being connected to said one-shot; and a master-slave flip-flop having a signal input lead, a set lead, a reset lead and first and second output leads, said input lead of said flip-flop being connected to said output lead of said one-shot, said first and said second output leads of said flip-flop each being connected to a corresponding one of said output leads of said timer, said set lead of said flip-flop being connected to said set input lead of said timer, said reset lead of said flip-flop being connected to said reset input lead of said timer.

Claim 10

A modem control as defined in claim 5 including: fifth and sixth timers each having first, second and third signal input leads, a set input lead and first and second output leads, said sixth timer having a third output lead, said first and said second signal input leads of said fifth timer being coupled to said receiver, said third signal input lead of said fifth timer being connected to said second potential, said set input lead of said fifth timer being coupled to said coupler, said third signal input lead of said sixth timer being connected to said second potential said first and said second signal input leads of said sixth timer being connected to said interface, said third signal input lead of said sixth timer being connected to said first potential, said first output lead of said sixth timer being connected to said coupler; and first, second and third gating means each having first and second input leads and an output lead, said first input lead of said first gating means being Connected to said first output lead of said fifth timer, said second input lead of said first gating means being connected to said interface, said output lead of said first gating means being connected to said set input lead of said sixth timer, said first input lead of said second gating means being connected to said second output lead of said fifth timer, said second input lead of said second gating means being connected to said second output lead of said sixth timer, said output lead of said second gating means being connected to said interface, said first input lead of said third gating means being connected to said interface, said output lead of said third gating means being coupled to said transmitter, said second input lead of said third gating means being connected to said third output lead of said sixth timer.

Claim 11

A modem control as defined in claim 5 including: first and second logic gates each having first and second input leads and an output lead; a third logic gate having first, second and third input leads and an output lead, said first input leads of said first, said second and said third logic gates each being coupled to said interface, said second input leads of said second and said third logic gates each being coupled to said interface, said output leads of said first and said third logic gates each being coupled to said coupler, said output lead of said second logic gate being coupled to said first and said second signal input leads of said fourth timer; and a dial tone detector having an input lead and an output lead, said input lead of said detector being connected to said interface, said output lead of said detector being coupled to said interface, to said second input lead of said first logic gate and to said third input lead of said third logic gate.

Claim 12

A modem control as defined in claim 5 including: fifth and sixth timers each having first, second and third signal input leads, a set input lead and first and second output leads, said sixth timer having a third output lead, said first and said second signal input leads of said fifth timer being coupled to said receiver, said third signal input lead of said fifth timer being connected to said second potential, said set input lead of said fifth timer being coupled to said coupler, said third signal input lead of said sixth timer being connected to said second potential, said first and said second signal input leads of said sixth timer being connected to said interface, said third signal input lead of said sixth timer being connected to said first potential, said first output lead of said sixth timer being connected to said coupler; first, second and third gating means each having first and second input leads and an output lead, said first input lead of said first gating means being connected to said first output lead of said fifth timer, said second input lead of said first gating means being connected to said interface, said output lead of said first gating means being connected to said set input lead of said sixth timer, said first input lead of said second gating means being connected to said second output lead of said fifth timer, said second input lead of said second gating means being connected to said second output lead of said sixth timer, said output lead of said second gating means being connected to said interface, said first input lead of said third gating means being connected to said interface, said output lead of said third gating means being coupled to said transmitter, said second input lead of said third gating means being connected to said third output lead of said sixth timer; first and second logic gates each having first and second input leads and an output lead; a third logic gate having first, second and third input leads and an output lead, said first input leads of said first, said second and said third logic gates each being coupled to said interface, said second input leads of said second and said third logic gates each being coupled to said interface, said output leads of said first and said third logic gates each being coupled to said coupler, said output lead of said second logic gate being coupled to said first and said second signal input leads of said fourth timer; and a dial tone detector having an input lead and an output lead, said input lead of said detector being connected to said interface, said output lead of said detector being coupled to said interface, to said second input lead of said first logic gate and to said third input lead of said third logic gate.