The following two icons are used to represent the signal bandwidth that will appear at different points of the premises wiring.
Indicates a voice-call signal.
Indicates mixed voice-call and ADSL signals.
Coloured lines are used represent the type of premises wiring as indicated below.
Standard twisted-pair telephony cable.
The majority of telephone premises-wiring uses star-wired or parallel-wired configurations. In a star-wired configuration the telephones are all wired back to a "master" socket or distribution box. In a parallel-wired configuration, the cable run passes sequentially from socket to socket at each telephone.
Star-wired configuration Parallel-wired configuration
Note: In any of the drawings in these reference pages, any analogue telephony device (fax analogue modem, answering machine, alarm unit, etc) can replace any telephone.