Building interphone

Building 2 way radio:
Extension of traditional talkback extension structure is divided into extension base and extension the handle.
A,Extension base main functions: fixed position extension, extension base have screws bits (according to different manufacturer, is directly through the extension of the screw hole installed base, also have an extension through the back-plane behind in extension for installation). In the extension base (or manufacturers in the extension of the installation has a terminals, used to connect the cable from the host-extension. Extension base have internal circuit board, the extension of control function.
B, extension handle: extension handle internal have speakers and microphones head, used to receive a speech and send voice.
The extension will face case with multiple key, according to an extension the function different, the number keys will change, but the most basic function keys is indispensable. Such as: the lock buttons, call button. The lock button main function is to host call extension, extension through this button at the door open electric lock; Call button mainly in digital networking system, the press the call button residents extension, management center can display the resident room number.
Management center machine: management center machine is installed in the community management center of call the intercom equipment, control the security door lock the opening of the electronic control unit.