OpenPhone 71/73/75: Extensions and accessories for system telephonesKeypad extensions556.2 Keypad extensionsUp to three keypad extensions can be connected to system telephones: eitherthree keypad extensions of the model KeyExtension 73P or three keypad exten-sions of the model KeyExtension 75D. A combination of these keypad extensionsis, however, not possible.The following equipment combinations are possible:The number of keypad extensions connected to a system telephone (up to three)can be set in the Configurator of the OpenCom 510’s Web Console (in the menuPBX Configuration: Devices: System Phones or VoIP Phones). Here the keys canalso be programmed as call keys or assigned functions or destination callnumbers. Users can change this programming as required.The maximum distance between the connecting socket that the telephone/keypad extension device combination is operating through and theOpenCom 510 must be less than 1000 metres. You will need a plug-in powersupply unit no. 4516000 (in Britain operate only the AC adapter with the part no.Keypad extension … … with the features connectable to a sys-tem telephoneKeyExtension 73P – 36 keys with LED indicator– Labelling on label strips– OpenPhone 73– OpenPhone 73 IP– OpenPhone 75– OpenPhone 75 IPKeyExtension 75D – 20 keys with LED indicator– 3 keys with LED indicator toshift levels; enables program-ming of 60 storage locationson each keypad extension– Labelling of the keys overthe display; each key is as-signed to a display line– OpenPhone 75– OpenPhone 75 IP
