olemus
kaablisoonte ümbris,
mitte tingimata väliskest (jacket)

näiteid
https://sc01.alicdn.com/kf/HTB1556eMpXXXXcaXFXX760XFXXX5/200160540/HTB1556eMpXXXXcaXFXX760XFXXX5.png

http://www.inmr.com/wp-content/uploads/2013/10/s17.jpg

https://duckduckgo.com/?q=cable+sheath&t=h_&iax=images&ia=images

ülevaateid
https://connectec.uk/blog/a-guide-to-cable-sheaths-and-jacket-types

https://www.fscables.com/other/blog/cable-sheath-materials--what-you-need-to-know.html

https://en.wikipedia.org/wiki/Tough_rubber-sheathed_cable

https://en.wikipedia.org/wiki/Thermoplastic-sheathed_cable

https://www.focabex.com/library-n/SHEATHING-MATERIALS-FOR-OPTICAL-FIBER-CABLES.pdf

https://ie.rs-online.com/euro/img/task-requests/103691/rs_cable_guide_jan21_ie.pdf?intcmp=IE-WEB-_-CP-C15-_-MCC_201_0321_NE-_-cable-guide