First, the wire and cable used to transmit electrical (magnetic) energy, information and the realization of electromagnetic energy conversion wire products, the generalized wire and cable is also referred to as cable, narrow cable refers to the insulated cable, which can be defined as: the following parts Aggregates; one or more insulated cores, as well as their respective possible cladding, the total protective layer and the outer sheath, and the cable may have additional uninsulated conductors. Used to transmit electrical (magnetic) energy, information and the realization of electromagnetic energy conversion wire products.
Broad wire and cable is also referred to as a cable, narrow cable is the insulated cable. It may be defined as a collection consisting of one or more insulated cores and their respective possible cladding, the total protective layer and the outer sheath, and the cable may have additional uninsulated conductors The
The main features of this type of product are: wide variety of specifications, wide range of applications, the use of voltage in the 1kV and more, in the face of special occasions continue to derive new products, such as fire-resistant cable, flame retardant cable, low smoke Smoke low halogen cable, anti-termite, anti-mouse cable, oil / cold / temperature / wear-resistant cable, medical / agricultural / mining cable, thin-walled wire.
Second, the harness for a certain load source to provide the overall service equipment, such as trunk lines, switching devices, control systems. The basic research of the theory of traffic is to study the relationship between traffic volume, call loss and harness capacity. Harness is an important basic concept in traffic theory.
The load source is the service object of the harness, usually refers to the user device; broadly speaking, the upper level device is the load source of the next level device. In the telephone communication, the load source is also called the source, the number of service devices in the wiring harness, called the harness capacity, the capacity of the harness is V, which serves the N load sources. Any of the load sources that originate the call can occupy an idle service device in the harness.