Your Data Lines Are Blocking It?

We can see the high-end data lines usually consists of several parts: plastic shell - braid - aluminum - copper wire. The innermost layer is wrapped up colored insulator conductor wire core (copper wire) for transmitting data signals and the current, the outer plastic shell is used to protect the wires; and what the role of the middle layer of aluminum foil and braid is it?

An important role of the data line is a transmission data signal. But we may be a variety of clutter interference in the use of information around. If we think of these interfering signals into the data lines of the inner conductor, is superimposed on the original transmission signal, is not likely to interfere with or alter the original signal transmission, resulting in a useful signal loss or a problem?

These braid and foil layer is to be transferred to our information protection and plays a role in shielding. Of course, not all of the data line has two screens and some have more than one shield, some only one, or even none. Shielding is a region of space between the two metal isolation to control the electric and magnetic fields and electromagnetic waves from one region to another region of the induction and radiation. Specifically, it is to use the shield conductor wire core surrounded, to prevent them from being affected by external electromagnetic / interference signals, but also can prevent electromagnetic interference inside the line / signal spreads.

Shielding of the data line is mainly composed of copper, aluminum and other non-magnetic material, usually braided copper mesh (aluminum-magnesium braid) or copper foil (aluminum foil, etc.), which is thin, much smaller than the frequency of use of a metal material the skin depth. It should be noted is that it must be connected to one end of the signal ground circuit, because the effect of the shield is not primarily due to the metal itself to an electric field, the magnetic field of reflection, absorption generated, but since the ground shield generated grounding different forms will directly affect the shielding effect.

General shielding wire production process is as follows:

Stranded Copper - extrusion (core) - Winding (inner core) - aluminum foil package - knit (or twisted) - Extrusion (Jacket) - Roll Packaging

In electronic cable, we often use letters to identify the use of presentation materials, such as:

AL for aluminum foil, such as: 4C + AL, meaning that the package of aluminum foil 4 core wire.

AB on behalf of weaving, such as: 4C + 80 / 0.10AB, meaning 4 core yarn to knit the specifications for the 80 0.10mm diameter copper wire.

S on behalf of winding, such as: 4C + 60 / 0.10S, meaning 4C winding wire, winding specifications for the 60 0.10mm diameter copper wire.