Abstract: A telephone terminal is configurable by a user to contain just those features desired by the user. Although equipped with a full set of available features, the terminal also is initially configured only with a minimum default set of features directly and easily accessible by a user. The user is able to reconfigure the telephone terminal for selectively adding features when he or she desired more capabilities.

Abstract: A cordless telephone public base unit employed in a public telephone system in close proximity with other public base units effectively avoids contention with these other base units for access to a cordless telephone handset unit generating a service request. Contention between the public base unit and the other public base units is resolved by assigning a specific one of a plurality of times during which the base unit may respond to the service request from the handset unit. The time in which the base unit responds to the service request may advantageously be determined by a randomly generated number, the received signal strength of the service request or a combination of these two parameters. Once access to the handset unit is acquired by a base unit and communications between these two units is established on a communications channel, all other handset units and base units are prevented from interfering with the communications between these two units.

Abstract: An arrangement for increasing the available character spaces for softkey label screen prompts in a small interactive display for use in a telephone terminal is provided. In a first configuration of the arrangement, available character spaces in the interactive display are partitioned into equal adjacent character sets with each character set having an allocated number of character spaces for displaying a softkey label. The telephone terminal is configured such that available character spaces in adjacent character sets are borrowed and used by a particular character set having a softkey label for display that exceeds the allocated number of character spaces in the particular character set. In a second configuration of the arrangement, a first character set is combined with an adjacent second character set for displaying the large softkey label.

Abstract: A locking arrangement is provided for limiting access to certain selected menu functions on a telephone terminal is provided. Although these functions are generally located in different sections of the menu hierarchy, each may be unlocked and relocked while a user remains in the same section of the menu hierarchy containing the selected function. For accessing the function, the user enter a password while located in the same section of the menu hierarchy as the function to be accessed. Once the password is entered, direct access to the selected menu function is permitted. The locking arrangement provides for the relocking of each of the selected functions automatically by the user simply exiting the accessed selected function.

Abstract: An echo suppression arrangement for use in a digital portable telephone prevents sidetone echo appearing in the base unit of the telephone from being coupled to and emanating at the handset unit of the telephone. The echo suppression arrangement determines the direction of dominant speech signals appearing in the base unit while communicating with the handset unit. These dominant speech signals either originate at the handset unit or at a remote telephone station and are received by the base unit over a telephone line connected to the base unit. If the dominant signal in the base unit is from the handset unit, the echo suppressor arrangement inserts a predetermined amount of loss into a receive voice path which couples signals to the handset unit. This prevents the sidetone echo from being produced in the handset voice receiver when the user of the handset unit is speaking.

Abstract: In a user-interactive display-based telephone terminal, a user of the telephone terminal is provided easy access at the terminal to both local features and network-based features from a telecommunication switch. The user of the terminal reconfigures the terminal to a state wherein network based information is obtained by simply actuating any of the associated network-based keys. Similarly, the user of the telephone terminal reconfigures the terminal to a state wherein local information stored in the terminal is obtained by simply actuating an associated local key. The information selected, local or network-based, is displayed in the same location in an associated display on the terminal. The user of the terminal is therefore not provided with nor is he or she required to have knowledge of the location of a particular feature.

Abstract: An apparatus provides digital data representative of a compressed high definition video image signal in a manner such that a conventional video tape recorder (VTR) employing current electrical and mechanical technologies is adaptable for reading this data for display in special modes such as fast forward, reverse and still frame. To minimize the loss of data while the VTR is operating in one of these special modes, the data representative of the high definition image signal is decoded by the apparatus to yield available time slots in the data stream. These time slots are then filled with data which duplicates the most important of the original transmitted data then existing in other time slots in the data stream. This duplicating of the data increases the likelihood that the important picture information will be read by the VTR while operating in a special mode.

Abstract: A telephone terminal configured to provide a personalized user selectable feature which is displayed whenever the telephone terminal display is returned to an idle state from accessing other available features on the telephone terminal. Any of the available features on the telephone terminal may be designated as the personalized user selectable feature. A user may, for example, select a feature in the terminal that he or she uses the most as the personalized user selectable feature. Rapid movement to and execution of this user selectable feature from any of the other features in the telephone terminal is thus facilitated.

Abstract: A remote charging cradle is configured for charging a cordless telephone handset unit and also permits the handset unit to receive and respond to a radio frequency ringing signal while located in this cradle. While being charged, the handset unit looks for a ringing signal over a direct-current charging path provided through its battery charge contacts. The operation which permits charging of the handset unit while also permitting the handset unit to receive a radio frequency ringing signal is achieved through a power cycling arrangement which controls the period over which the charging current from the cradle is applied to the handset unit. By applying this charging current periodically and then only for relatively short periods of time, the handset unit is able to sense the radio frequency ringing signal generated by an associated base unit during those periods when the charging current is not being applied and thereby respond to the ringing signal.

Abstract: In a public cordless telephone system, a cordless telephone handset unit requests and establishes a communications link with a public base unit served by a desired local service provider whenever possible. By generating a service request containing a specific carrier request code, the handset unit selectively identifies an available public base unit served by the desired local service provider and then establishes a communications link with this base unit. In response to receiving the service request from the handset unit, all public base units operated by the chosen service provider respond by providing a first acknowledgment signal. All other public base units respond by providing a second acknowledgment signal. When both such signals are received, the handset unit responds only to the first acknowledgment signal and establishes a communications link with the first base unit providing this signal.

Abstract: An interactive display arrangement in a telephone terminal permits direct movement between unrelated child menu screens in a menu hierarchy. The arrangement is configured such that a user may advance directly from a displayed first child menu screen to an unrelated second child menu screen in the menu hierarchy, in order to perform specific tasks at the second child menu screen. Once the tasks at the second menu screen are completed or the user elects not to perform such tasks, the arrangement permits the user to return directly to the first child menu screen. The user of the telephone terminal thus is able to easily complete specific tasks at selected menu screens in the interactive display arrangement without the need for excessive movement in the menu hierarchy.

Abstract: A cordless telephone arranged for operation in a frequency hopping system conserves battery power in a handset unit when this unit is located remote from an associated base unit and in a standby state. While in this standby state, the handset unit resides in a low power monitoring mode and monitors a channel pseudo-randomly selected from a plurality of available channels in the frequency hopping band for receipt of an initialization signal from the associated base unit. The base unit similarly monitors this selected one of the channels for receipt of this initialization signal from the handset unit. Should ongoing communications between the base unit and the handset unit be inadvertently interrupted, the cordless telephone quickly re-establishes communications in the frequency hopping system through an initialization process executed by both the handset unit and the base unit.

Abstract: An inexpensive software copy protection arrangement prevents the unauthorized use of customized software for a private branch exchange switch. The arrangement employs a process which recognizes the signature of typical unauthorized activities and freezes the administration capability of the private branch exchange switch when such signature is detected. By freezing the administrative capabilities, the addition, removal or change of an administrative port, extension or routing pattern on the private branch exchange switch is prevented.

Abstract: A cordless telephone arranged for operation in a frequency hopping system automatically modifies a frequency hopping sequence in the presence of interference detected on its in-use communication channels. Substitute alternative communication channels are identified and then substituted for those communication channels experiencing the interference without disruption of communications between a handset unit in the cordless telephone and its associated base unit.

Abstract: A data terminal interface for a terminal adapter and an attached computer provides complete flexibility and control of information in a communication environment for a user. Communications between the terminal adapter and a digital network may be provided in existing digital systems, such as either the Digital Communications Protocol or Integrated Services Digital Network system, for example. The data terminal interface facilitates the exchange of information between the terminal adapter and the computer via an asynchronous data module in the terminal adapter. Through the data terminal interface, the computer is able to directly control user interface circuitry in the terminal adapter by responding to and sending unlimited information to this interface circuitry since conformance to a digital protocol is not required for message traffic between these two units.

Abstract: An apparatus and method are disclosed for implementing a polarization-independent optical switch wherein switchable communication signals are retained in the optical mode while being switched between optical links in an optical communication network. The polarization-independent optical switch comprises polarization-dependent components which are advantageously arranged to switch arbitrary polarized light waves. The polarization-independent optical switch is achieved by splitting incoming arbitrary polarized light waves into two paths, a light wave with a TE radiation component and a light wave with a TM radiation component. The light wave with the TE radiation component is converted to a light wave with a TM radiation component. Both light waves having the TM radiation component are then switched in a polarization-dependent photonic switch device.