Abstract: To make such an ordinary hub as works on the power fed through a power adapter connected to a commercial power supply be capable of maintaining its hub-function without interruption even when a commercial power supply failure occurs. The ordinary hub is connected to a line securement power supply unit 8 that is power-fed from a POE-compliant power-feeding hub 3 through a communication cable 5c, wherein a means for producing a power for an ordinary hub using a power fed through said communication cable 5c so as to feed produced power to an ordinary hub 2; and a storage battery 806, which stores power while power-receiving, to be used as the power source for producing a power for said ordinary hub when a power failure, are provided in said line securement power supply unit 8.

Abstract: An emergency call panel which comprises call buttons previously assigned to standard calls transmitted from an emergency call server of an emergency communication system, and transmission buttons for transmitting the data regarding the call selected from the standard calls to a call server in situation that one of the call buttons is selected in response to one of the standard calls. An emergency call system comprising a call server and an emergency call panel for carrying out the call processing of the call server, which comprises selecting the call button in response to the standard call based on call content and sending an initiation demand data including the selected data for standard call to the call server at the emergency call panel, and carrying out the call processing at the call server when the call server receives the initiation demand data.

Abstract: To make such an ordinary hub as works on the power fed through a power adapter connected to a commercial power supply be capable of maintaining its hub-function without interruption even when a commercial power supply failure occurs. The ordinary hub is connected to a line securement power supply unit 8 that is power-fed from a POE-compliant power-feeding hub 3 through a communication cable 5c, wherein a means for producing a power for an ordinary hub using a power fed through said communication cable 5c so as to feed produced power to an ordinary hub 2; and a storage battery 806, which stores power while power-receiving, to be used as the power source for producing a power for said ordinary hub when a power failure, are provided in said line securement power supply unit 8.

Abstract: An emergency call panel which comprises call buttons previously assigned to standard calls transmitted from an emergency call server of an emergency communication system, and transmission buttons for transmitting the data regarding the call selected from the standard calls to a call server in situation that one of the call buttons is selected in response to one of the standard calls. An emergency call system comprising a call server and an emergency call panel for carrying out the call processing of the call server, which comprises selecting the call button in response to the standard call based on call content and sending an initiation demand data including the selected data for standard call to the call server at the emergency call panel, and carrying out the call processing at the call server when the call server receives the initiation demand data.