CW1128 cable is made up from conductors of solid plain copper insulated
with cellular (foamed) polyethylene. These conductors are twisted into
pairs and the required number of pairs are laid up into units which are
identified by coloured tapes. The cables are petroleum jelly filled and
sheathed in black polyethylene, and are manufactured in accordance with
BT type CW 1128 for external use only.
Extenal Grade CW1128 Telephone Cable