Internal Building Communications

This includes the Doorbell, Phones and Panic Alarm.

The systems are all powered by a 12V transformer sitting under the tech box desk far end, stage right. The panic alarm and phones are almost two separate systems that meet in the tech box and use the same cabling to speak to the tech box and other parts of the building. The cabling system is based on bell wire (12 cores) though there is a small section in the servery that uses two small stretches of cat5 (8 cores) (this is because we couldn’t find any bell wire and currently the building has kilometres of cat5)

Cable map

Please note that the cables are of the age that make them brittle buggers and liable to snap at any movement. This also means that they have faded and as such identifying the colours is a pain. When two colours are listed, i.e. White/Blue this denotes White wire with Blue stripes.

Channel	Name	Bell	Cat5	Phone
1-Serv	Servery	Green/White	Green	Black
2-TB	Tech Box	White/Green*	White/Green	D Brown
3-BS	Back Stage	Brown/White	Brown	L Brown
4-BO	Box Office	White/Brown	White/Brown	Purple
5-SP	Spare	Grey/White	Orange	Orange
6	-	-	-	Yellow
7	-	-	-	Peach
8	-	-	-	White/Blue
9	-	-	-	Grey
10	-	-	-	Grey?
Incoming Call	-	-	-	White
Voice	Phone Line	Orange/White	White/Orange	Mint Green
+	+12V	Red/Blue	White/Blue	Red
-	0V	Blue/Purple	Blue	Blue
PANIC	Panic Alarm Trigger	White/Orange	White/Orange#	-

*The White/Green wire between BO and Serv has a break in it somewhere; this has been fixed by using the White/Grey wire over this section.

# This means that it is in the second cat5 cable (the one with the green tape on it)

The phones themselves are all hardwired together so that when any phones are picked up at the same time users at each end may communicate. This means that without anyone calling anywhere else, a 4 way conversation is possible. If someone has the phone off the hook, you can’t call them (this is a good thing because then you can’t deafen the person holding the handset)