The telecommunications standard for corsslinked polyolefin insulated cables for electric powers in communication systems is reviewed in this paper.The technical performances of halogen—free

low—smoke

flame—retarded and corsslinked polyolefin insulation are illustrated.On the other hand

the bad effects of poly（vinyl chloride） insulated cables on envioronment and human health are criticized.By comparisons

it is claimed that the corsslinked polyolefin insulated cables posses great advantages over PVC insulated cables and halogen—free.low—smoke

flame—retarded but non—crosslinked polyolefin insulated cables.The technical developments in low—voltage cable are summarized

including the crosslinking routes

the additives for cable polymers and the compounding technology.Finally

how to promote the developments of the low—voltage electrical cables for electric powers in communication systems and how to modify the related telecommunications standards are recommended.Bend insensitive

Single mode fiber

Macrobend

Attenuation

Loss

Whispering gallery modes.