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Anonymous
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4g Synchronicity

Anyone know why 4g services and fibre broadband, for that matter, aren't syncronous for upload and download?

 

I totally get that back in the day asynchronous digital subscription was hard coded into the technology and the name, ADSL, but why has it become standard? Is it a technology issue or cost or something else?

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Level 21: Regular
Posts: 709
Registered: ‎04-04-2012

Re: 4g Synchronicity

Actually ADSL stands for Asymmetric Digital Subscriber Line, and was designed to make the best use of the copper telephone lines, by allowing different frequencies along the same copper line, hence the use of the splitter to isolate the data frequency.

ADSL / vADSL usually has a different upload and download speed

If you want true Asynchronous data transmission then some ISP's will sell it you at a massive price increase.

Enterprises can get async 4G/LTE but this requires routing into their network and network management being applied at this level to try and give same speeds.
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Anonymous
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Re: 4g Synchronicity

Synchronicity would be  the upstream and downstream being sent at the same time and regulated by the same clock source (networking equipment either contains it's own clock source to sequence it or can be connected to an external one)

 

What you are actually asking is why connections aren't symmetric.

 

The reason is cost as receive (downstream) and transmit (upstream) are separated and most applications receive more than they transmit meaning the network operator spends more on downstream bandwidth than upstream as this means they can use this as a shared resoruce and distribute the cost among the customers because it does not require permanently dedicated bandwidth though the backhaul from a street cabinet or exchange should have capacity to cope with all customers using their connection to the max.

 

An organiation with a lot of employees or that have employees connecting in via VPN or that hosts it's servers that customers connect to will typically have a dedicated symmetric fibre circuit but as this requires dedicated resource a telco will charge more for it (they typically come with various service level agreements that impose penalties on the telco if faults aren't fixed within so many hours as well as round the clock support)

 

Mobile networks are harder to plan because the base is well, mobile so based on what I have said above it's unlikely there'll be a true symmetric service.

 

Happy to explain more of the technicalities for anyone interested but bit too shattered tonight.

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Anonymous
Posts: 0

Re: 4g Synchronicity

Thank you @Anonymous & @madasaf1sh

 Both helpful and very informative! 

:-)