Sheaths can be added and edited in FibreMan, even after they have been spliced.
The user will be warned if the changes they make will affect existing splices.
Sheath labels begin with the region code (eg. MT) followed by a 10 character sheath ID. All of the
sheath details (Manufacturer, tube and fibre counts, start, end, owner, payload, etc.) are all defined here.
New sheaths can also have mid-span housings inserted here along with the identifying meter marks.