Internal Building Communications

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Revision as of 20:06, 17 March 2006 by 212.225.13.42 (talk) (change "phones" to "intercoms")

This includes the Doorbell, Intercoms and Panic Alarm.

Intercoms

The handsets themselves are all hardwired together so that when any handsets 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. When the phone is called, a loud buzz is produces by the speaker in the headset. 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). Don't try and be funny by phoning yourself, those buttons are disabled so nothing will happen!

The phones are situated in 4 strategic locations around the building:

Number Location
1 Servery
2 Tech Box
3 Back Stage
4 Box Office
5 Spare/Unused

Back stage the intercom can be silenced by a small switch on the side of the unit. Regardless of whether it has been silenced or not, a small LED on the wall above the table will flash.

In the Techbox, the phones can be silenced using the show switch. When the show switch is activated, the LEDs along the front of the Techbox will flash green instead of hearing a buzz.

Power and Cables

The systems are all powered by a 12V transformer sitting under the tech box desk far end, stage right (under lighting desk). 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)

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