Abstract: An interface for connection between incoming telephone lines and the customers equipment has a base for mounting on a support surface, with terminals for connection of incoming telephone lines and one or more plug-in positions for plug-in modules. Protectors are positioned in the modules. Each module has a modular jack. An intermediate cover fits over and is attached to the base, covering also the modules but with one or more apertures for access to the jack or jacks. The conductors from the customers equipment either terminate in modular plugs which insert directly into the jacks or terminate in spade terminals which are connected to terminals on the intermediate cover. In the latter case, a short interconnect cable connects at one end to these terminals and at the other end has a modular plug for insertion into a jack. An outer cover extends over the intermediate cover and the modular jack or jacks.

Abstract: In a telephone usable as both table mounted type and wall hung type by selectively changing the direction of attaching of a holding board of which upper side extends at a certain inclination angle relative to the bottom thereof, a casing of the telephone is detachably fitted onto the holding board. The holding board includes receiving means for receiving telephone cable in the form of a bundle and it is formed with an inlet hole through which the cable is introduced into the holding board and an outlet hole through which it is taken from the same. As required, an excessive part of the cable is received in the holding board and thereby an usable length of cable can be reduced remarkably.

Abstract: A distributed privacy oriented telephone extension system having up to three different kinds of privacy circuits of different capacity for coupling a respective extension phone to the telephone line. Selective user configuration of the telephone extension system effects one level of privacy control and spontaneous user control during conversation to disconnect or reconnect other phones effects a second level of user control relating to the extent of privacy achieved.

Abstract: Aircraft communications apparatus includes a permanent communications system, a temporary communications system and an interface coupler connecting the permanent and temporary communications systems. The coupler consists of a plurality of opto-isolator circuits each of which couples signals between one of the permanent communications and one of the temporary communications circuits thereby reducing the transmission of noise between the circuits. The coupler further includes a plurality of normally-closed bypass relays each connected in parallel with one of the opto-isolator circuits which are controlled by manually-operated switches to bypass the opto-isolator circuits in the event of a malfunction.

Abstract: A telephone switch (10) having a data port (DNS) and a vioice port (VPS) is connected to an electronic telephone (12) having a data port (DNT) and a voice port (VPT) through the preferred embodiment (19). A plurality of external devices (13a, 13b, . . . 13n) are also connected to the preferred embodiment (19). When no external device (13a, 13b, . . . 13n) is active, a relay (33) directly connects the voice port (VPS) of the telephone switch (10) to the voice port (VPT) of the electronic telephone (12). When an external device (13a, 13b, . . . 13n) is active, the relay (33) directly connects the voice port (VPS) of the telephone switch (10) to the voice port (V) of the external device (13a, 13b, . . . 13n) and also connects these voice ports (VPS, V) to the voice port (VPT) of the electronic telephone (12) through a resistor network (20, 21, 24, 26, 30) which passes operating power to the electronic telephone (12) but reduces or eliminates audio signals to/from the electronic telephone (12).

Abstract: An automatic disconnect device with a protected ringer for providing a secure telephone system, the device being interposed between the telephone company outlet and a modified telephone set. The device generates its own audible tone burst only when a standard ring signal is generated by the telephone company and is designed so that no ambient sound can be transmitted back to the telephone outlet. An on-hook/off-hook detector is incorporated in the device to determine when the handset has been lifted off-hook. If off-hook, the telephone operates normally. In the on-hook status, or position, the telephone is automatically disconnected from the telephone outlet at all times. A visual indication is provided when the telephone is on-hook. The incoming telephone company lines from the outlet are conditioned by filters within the device such that the device is not affected by signals other than normal telephone signals.

Abstract: A telephone terminal box which is divided into two compartments so to provide a first compartment accessible only to the telephone operating company and a second compartment accessible to the subscriber. Each compartment has its own cover, and the covers may be individually locked by the subscriber and by the telephone company. The box is constructed so that if it becomes necessary, the telephone company can gain access to the subscriber compartment, however, the subscriber cannot gain access to the telephone company compartment. A terminal block is mounted in the subscriber compartment to provide connections to a predetermined number of subscriber telephones. A protector block is mounted in the telephone company compartment, the terminal block being wired at the factory to one side of the protector block.

Abstract: An adapter circuit and system for coupling a telephone answering machine to two telephone lines. The adapter may be set so that the telephone answering machine will answer one or the other of the telephone lines, as determined by setting a mode selector switch to an "automatic" position; so that the telephone answering machine will answer only one of the telephone lines as determined by setting the mode selector switch to a "Line #1" position, or so that the telephone answering machine will answer only the other of the telephone lines by setting the mode selector switch to the "Line #2" position.