[Light edits to emphasise versions]
What are the exact requirements of TIA/EIA 568 cabling standard as regards to the length of patch/work area cables?
Specifically, I see from my 2001 copy ANSI/TIA/EIA-568-B.1-2001, Section 220.127.116.11 "Maximum lengths for copper cabling" has formulas for total length of cable against lengths of work area cable and patch cable, with deratings for various thicknesses of stranded cable. Table 6.1 shows patch + work area cables up to 27 m, shown against reduced horizontal cable lengths down to 70 m.
My understanding was thus it was within standard to have longer stranded cords at the ends if you have shorter horizontal lengths.
But I'm also told that certification authorities such as BICSI in the US require patch + work area cords to be no longer than 10 m.
Or are there additional documents from eg BICSI certifications that should also apply? Or have I misread 568 somehow?
- The same material about cable lengths appears in ANSI/TIA-568-C.1 (2009), as section 18.104.22.168.1.
- The current version of ANSI/TIA-568 D, from 2015