The international ISO/IEC standard is almost identical with the European EN standard. In contrary to the American TIA/EIA standard they differentiate categories and classes. A category specifies the methods and values by which individual components must be tested. This means that individual components can only be tested and specified according to a category. By connecting products which meet a certain common category the complete system is defined by this category. The component meeting the lowest category defines the value of the class.
The following Ethernet network applications are specified for the classes D to FA in the EN 50173-1 standard:
10 Gigabit Ethernet is transferred over all 4 pairs, full duplex with 2.5 Gbit/s per pair, at an operating frequency of 417 MHz.
AlienNEXT (Alien Near End Crosstalk) is the interference of a signal from one pair of a cable to a pair of another cable.
The EN 50174-2 standard describes the segregation of metallic information technology cabling and power supply cabling
The segregation distances depend on the following factors:
• The electromagnetic compatibility (EMC) of the information technology cable
o Coupling attenuation for shielded symmetrical cables
o Transverse conversion loss (TCL) for non-shielded symmetrical cables
o Screening attenuation for asymmetrical (coaxial) cables and twin axial cables
• The design of the power supply cable
• The dimensions of the power supply cable and the type of the powered electric circuit
• The existence of segregators between the information technology cabling and the power supply cabling.
The segregation distances are determined according to the EN 50174-2 standard (Segregation of Metallic Information Technology Cabling and Power Supply Cabling).
The following methods of measurement are used to obtain acceptance test measurements:
Permanent Link - Without Patchcords.
Channel - With Patchcords.
The 2-connector channel is the type generally used.
The 4-connector channel is rarely used. Basically, it consists of two additional connectors added to a 2-connector channel. This channel is harder to sustain. Therefore, the components must be precisely adjusted to one another.