User subsystem: The user subsystem consists of the connection of the terminal device to the information outlet, which includes connectors and adapters.
Horizontal subsystem: A connection between the information socket and the management subsystem (jumper racks), which is commonly used in five or five types of 8-core 4 pairs of twisted-pair wires to achieve this connection.
Management subsystem: The management subsystem is made up of interconnected and interconnected wiring racks. Management points provide a means of connecting to other subsystems. The interconnection and interconnection allow the communication lines to be positioned or relocated to different parts of the building, so that communication lines can be managed more easily, allowing for easy insertion during mobile terminal equipment.
Backbone SUBSYSTEM: The realization of computer equipment, program-controlled exchange (PBX), control center and the connection between the management subsystem, the common medium is large logarithm twisted pair cable, cable.
Equipment SUBSYSTEM: The equipment room subsystem is composed of cables, connectors and related supporting hardware in the equipment, it connects the various equipments of the common system equipment to each other. The subsystem connects the intersection of the trunk and the intersection with the common system device (such as a PBX).
Complex subsystem: To achieve mutual connection between buildings, commonly used communication medium is optical cable or large logarithm, the main line and the building blocks between the use of optical cable or large logarithm.