What does TD mean in the weak current diagram?

TD is an information socket, and TO is a telephone and information dual-port socket. Weak current generally refers to DC circuits or audio, video lines, network lines and telephone lines, and the AC voltage is generally within 36V.

Telephone, computer, TV signal input (cable TV line), audio equipment (output line) and other household appliances are all weak current electrical equipment. Weak current refers to low-voltage electric energy such as safe voltage grade and control voltage stipulated by the state, which is divided into AC and DC.

Alternating current below 36V and DC below 24V, such as 24V DC control power supply or emergency lighting standby power supply. The other is information sources including sound, images and data, such as telephone, television and computer information.

Extended data:

Common weak current systems include: CCTV monitoring system, burglar alarm system, entrance guard system, electronic patrol system, parking lot management system, visual intercom system, home intelligence system and security system, background music system, LED display system, plasma splicing screen system, DLP large screen system,

Three-meter CC system, building automation system, lightning protection and grounding system, paging intercom and professional intercom system, weak current pipeline system, UPS uninterrupted power supply system, computer room system, integrated wiring system, computer local area network system, property management system, multifunctional conference room system, cable TV system,

Satellite TV system, satellite communication system, fire fighting system, telephone communication system, hotel management system, video-on-demand system and so on.

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