We can define the paper formats according to their measures and these are defined in ISO standard 216 one, which in turn includes the standard DIN 476. This applies in most of the world. I there are plenty of measures for the role, but the most used are the Serie A and to a lesser extent Serie B.

In Serie A, the most widely used format is the A4 (210x297mm) or also called "sheet" used in most printers and fotocopiadoras.

Series B is defined for intermediate sizes Series A. For example, the B4 is the intermediate size between A3 and A4.

As network cables, fiber optic cables have their international standards. In this instance they are divided into OM1, OM2, OM3 and OM4. The difference between them is based on differences in bandwidth, speed, inside diameter as seen in the table below. To help clarify some concepts, would 9/125 (inside diameter/outside diameter). In the bandwidth can be 850nm, 1350nm or one550nm (nanometers). In the case of application we have put a guidance to help understand the concept, but actually it can be used in many areas.

LSHF Cable (Low Smoke Halogen Free Cable) or also called LSZH (Low Smoke Zero Halogen) is a type of international classification that is used to cover the wires in the cable industry both steel and other types. LSHZ has a thermoplastic coating that propagate little heat sources. Another carasterística do not emit toxic gases or fumes when exposed to flame. You have to take into account that surfacertas facilities may be required by the competent authority using these cables.