These are used to receive internal and external calls between two parties and allow two or more people to communicate without being in the same location
- Telephones
Anybody can think of some others... Your own or "others"
Posted 10 July 2012 - 09:13 PM
These are used to receive internal and external calls between two parties and allow two or more people to communicate without being in the same location
- Telephones
Posted 10 July 2012 - 09:30 PM
Posted 10 July 2012 - 09:45 PM
Posted 10 July 2012 - 09:46 PM
Not entirely sure what this is all about, but I'll run with it...
Telephones...
from 'Tele' meaning across and 'phone' as in phonic - relating to speach or sounds. Soundwaves are converted into electrical waves by means of a carbon granule transmitter - in which carbon granules are vibrated by the sound against a membrane inducing a variable electrical current, where upon they are conveyed through a pair of copper wires via a switching mechanism to another receiving apperatus whereby another carbon granule receiver converts the electrical signal back into a sound wave.
Notification of someone wishing to converse with you is by means of a 76 volt AC current which certainly makes you jump if you're the telephone engineer working on that particular pair of conductors, and makes the exchange technician - who may or may not be called Colin and lives in Salisbury - wet themselves laughing as they generated the ringing current from the exchange, knowing full well which line you were working on at the time. The line then has to be tested back to the exchange by the now tingling engineer for no other reason than pure spite and vengence, by means of sending a 500v DC current from a machine called a 'Megger' which measures resistance, inductance etc of the conductors as well as totally frying the circuit board for that particular number at the exchange, causing the exchange Tech (who might be called Colin) to spend the rest of the day swapping and rebalancing a new circuit board in the main PABX switch...
Posted 10 July 2012 - 10:04 PM
Posted 10 July 2012 - 10:07 PM
Posted 10 July 2012 - 11:48 PM
Posted 11 July 2012 - 01:07 AM
Posted 11 July 2012 - 04:35 AM
Edited by gsdk9, 11 July 2012 - 04:35 AM.
Posted 08 August 2012 - 07:52 PM
Posted 08 August 2012 - 11:48 PM
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