Abstract: An event monitoring system for payphones is described. Particularly, an arrangement for monitoring events such as the removal of the front cover, vault door and coin box is described. Sensors attached to brackets generate signals indicative of front cover, vault door and coin box removal are sensed by a monitoring circuit and sent to a central telephone office as appropriate. The brackets allow easy mounting of the sensors using existing payphone housing hardware, surfaces and cutouts. Consequently, this mounting arrangement may be used to retrofit standard payphones using only pre-existing mounting locations and holes to include event monitoring capability. The sensors and monitor circuit operate on low power and may be designed to operate in the absence of payphone power.

Abstract: A permanent connection public telephone appliance is provided for connection to the switched network by a connection unit. It is permanently fed with power romotely by a source of the connection unit connected in parallel across the line of the appliance. The switched network is isolated from the source by capacitors. Line connection to the appliance is provided by a relay of the connection unit.

Abstract: A public terminal receptacle for containing, protecting, and allowing a user access to a computer terminal, telecommunications device for the deaf, or another type of terminal which is telephonically linked and physically adjacent to a public telephone through which the terminal may telecommunicate with other electronic devices. The public terminal receptacle includes a housing having an opening and which is adapted to be attached to a public telephone booth, a drawer which is slidably mounted within the housing to move between a closed position where the drawer is within the housing and an open position where at least a forward portion of the drawer extends out through the opening, the terminal, and a motor drive system mounted within the housing and which is drivingly connected to the drawer for opening and closing the drawer in response to specific electrical signals.

Abstract: A paystation telephone level control system is disclosed including a telephone receiver driven by a local amplifier and wherein two sets of attenuating resistors, a coarse attenuation set and a fine attenuation set, interface with connectable terminals of a binary control crosspoint switch. The presence or absence of coin tones and dialing tones are detected and the crosspoint switch discretely controlled by their presence to effect discrete levels of attenuation of signals fed to the receiver. In addition, the lever of attenuation during voice communications is a function of a pre-adjusted attenuation and a user selection.

Abstract: A line interface unit for controlling receipt and delivery of voice messages over a telephone system having a voice message facility connectable to at least one calling station and a called station via a central office. The interface unit comprises a first switch connected to the calling station in the tip and ring lines and a second switch connected to the central office in the tip and ring lines, the switches having first and second positions and wherein said signals on the tip and ring lines are connected directly between the calling station and the central office when each of the switches is in the first position. In operation, a control circuit of the line interface unit responds to detection of a busy/no answer condition at the called station for switching the first switch from its first to second position to connect a speech circuit to the calling station for issuing a prompt.

Abstract: A public terminal receptacle for containing, protecting, and allowing a user access to a computer terminal, telecommunications device for the deaf, or another type of terminal which is telephonically linked and physically adjacent to a public telephone through which the terminal may telecommunicate with other electronic devices. The public terminal receptacle includes a housing having an opening and which is adapted to be attached to a public telephone booth, a drawer which is slidably mounted within the housing to move between a closed position where the drawer is within the housing and an open position where at least a forward portion of the drawer extends out through the opening, the terminal, and a motor drive system mounted within the housing and which is drivingly connected to the drawer for opening and closing the drawer in response to specific electrical signals.

Abstract: A public telephone set that processes call charge information is provided. The set includes a register for holding a pre-determined number of digits of the dialed number and a memory in which dial control codes corresponding to the predetermined number of digits are stored in advance. Depending upon the telephone number that is dialed, a memory location is directly addressed to obtain a control code. The control code specifies a memory location in which charging information such as a charge or time increment is stored. This information is then processed to determine the appropriate charge for the number dialed.

Abstract: The apparatus comprises a post anchored to the ground including a closable compartment containing a removable coin box, and a container attachable to the post. The post comprises means for concomitantly opening the compartment, extracting the coin box from the compartment and releasing the container from the post for access to internal means included in the post and the container. The apparatus has only a single entrance for access to the coin box compartment and internal means, thus providing effective protection to the interior of the apparatus at low cost.

Abstract: A telephone apparatus, such as a public telephone, in which a voice and tone signals transmitting medium between a fixed station connected to a telephone line and a handset detachable from the station is free of disturbance. A modulation circuit for transmitting voice and tone signals from the telephone line to the handset and a demodulation circuit for transmitting voice signals from the handset to the telephone line are included in the station and are connected respectively to a demodulation circuit connected to an earphone of the handset and to a modulation circuit connected to a microphone of the handset, via two low frequency magnetic coupling coils. The circuits contained in the handset are remote supplied by a power supply circuit included in the station, via third magnetic coupling coils.

Abstract: A pay telephone having a housing is removably mounted on a mount. The mount and housing have cooperating pins and inclined slots arranged to retain the housing on the mount and permit the housing to be lifted from the mount. Locks mounted on the housing have movable members that engage a lip secured to the mount prevent the housing from being lifted from the mount. The movable members are turned with keys to positions which permit the housing to be lifted from the mount.

Abstract: In a coin telephone, a self diagnosis function and an alarm information transmission function upon formation of a loop in an off-hook mode are utilized. Upon reception of a ringing signal from a maintenance control center, self diagnosis is performed. Upon detection of a failure, a content of the failure and a control number of the coin telephone are sent to the maintenance control center. A failure check for a coin telephone which is not frequently used can be performed from the telephone center without requiring an off-hook operation.