What is the difference between the permanent link and the channel link?

In structured cabling, two types of links are usually defined: a permanent link, a channel link. A permanent link is the link between the telecommunication outlet and the horizontal cross-connect. This distance should not exceed 90m.

On the other side, a channel refers to the permanent link in addition to the patch cords and equipment cords. This distance should not exceed 100m.

Source: https://www.telegaertner.com/en/info/special-topics/basic-knowledge/kupfernetze/messungen/

The ANSI/TIA standards permit a maximum of 2 connections in a permanent link and 3 connections in a channel (cross-connection or inter-connection). 

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