IEC PAS 61156-1-4:2010 数字通信用对绞或星绞对称电缆.第4-1部分:传输特性1000 MHz以下的数字通信用对绞或星绞对称电缆.基于IEEE 802.3的极限输电用导体加热的成束基准标高电缆
Multicore and symmetrical pair/quad cables for digital communications – Part 1-4: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz – Conductor heating of bundled data grade cables for limited power transmission based on IEEE
This PAS is a technical supplement to IEC 61156-1, edition 3 (2007): Multicore and
symmetrical pair/quad cables for digital communications – Part 1: Generic specification.
This PAS, covering exclusively four-pair data grade cables, is intended to provide a test
method for the determination of the maximum attained conductor temperatures which occur
due to the deployment of the IEEE protocol for PoE /PoEP.
It gives as well the required background information about the thermodynamic behaviour of
such bundled cables, if they are located in areas with restricted heat dissipation, a reality which
occurs in every installation situation. However, only the basic principles are given, as the
rigorous application and solution of these problems fall into the relevant cabling standards.