That reminds me - is anyone interested in how SMS came to be? I can bore you to tears if you want to know.
Sod it, I will be a sadist anyway. If you are offended by this, turn away now...
When we first started to build the GSM networks us engineers needed a communication system that placed no payload on the 8 traffic channels available on each single transmitter channel. GSM used a lot of signalling to control phone/base station transmission power levels, location updates and site hand overs. There is spare capacity in these signalling channels (SDCCH) and it places no load on the network. So these channels were used for SMS. Very convenient. This was no accident as this capacity was designed into the GSM system. So as integration and commissioning engineers we could text each other site data free of charge, leaving the traffic channels free for customer use.
So for a number of years those of us in the know used these signalling channels for SMS - free communications! But then the secret got out and the operators capitalised on this. Fair play to them I say! As SMS is now the biggest earner for many operators worldwide. The hardware costs about £275K as I recall and the maintenance costs are minimal. Easy munnee!!
However, SMS is the most expensive method of communication when looked at as £/byte used... I think it amounts to about £750/Mb!!! If I am wrong here, please correct me.
Sod it, I will be a sadist anyway. If you are offended by this, turn away now...
When we first started to build the GSM networks us engineers needed a communication system that placed no payload on the 8 traffic channels available on each single transmitter channel. GSM used a lot of signalling to control phone/base station transmission power levels, location updates and site hand overs. There is spare capacity in these signalling channels (SDCCH) and it places no load on the network. So these channels were used for SMS. Very convenient. This was no accident as this capacity was designed into the GSM system. So as integration and commissioning engineers we could text each other site data free of charge, leaving the traffic channels free for customer use.
So for a number of years those of us in the know used these signalling channels for SMS - free communications! But then the secret got out and the operators capitalised on this. Fair play to them I say! As SMS is now the biggest earner for many operators worldwide. The hardware costs about £275K as I recall and the maintenance costs are minimal. Easy munnee!!
However, SMS is the most expensive method of communication when looked at as £/byte used... I think it amounts to about £750/Mb!!! If I am wrong here, please correct me.
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