1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 , TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITUCONSTRUCTION, INSTALLATIONAND PROTECTION OF CABLE AND OTHERELEMENTS OF OUTSIDE PLANT#!“,%G0G03(%!4(3G0G0G0-!$%G0G0/b) a steel sheath is not vulnerable to vibration caused by road or rail traffic;c) a corrugat
2、ed metal sheath has good flexibility;d) a corrugated metal sheath with a smooth outer covering is easy to handle during installation;e) the same type of cable can be laid direct in the ground or polled into ducts;f) such a sheath resists moderate crushing stresses and provides protection against most of the damage causedby stones or digging tools;g) if the plastic covering of steel-sheathed cables is damaged, rapid corrosion may be expected.Reference1 CCITT manual Outside plant technologies for public networks, ITU, Geneva, 1988, Part IV-A, Chapter III, 1.2.2.
