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Inside AT&T’s 83 GB/hour mobile cell tower

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Re: Inside AT&T’s 83 GB/hour mobile cell tower

#11

So light on details.. could have mistaken it for a press release. And more amazing, they managed to get some of that wrong. In their graphic, they mislabeled the mobile command post as H, and G in the key... and "AT&T’s network is about 80% iPhones" then link to an article about _smartphone_ sales in _Q4 of 2012_

Maybe they're taking about people who use the smart bit of their smartphones?

Re: Inside AT&T’s 83 GB/hour mobile cell tower

#12

To convert to more normal units, that is about 189 Mbits/second. Which sounds a little less impressive considering the peak 4G speed is supposed to be 100 Mbit/second.

I thought 83 GB/hr seemed like not much capacity, and indeed that really isn't much. I've seen these units (and from other carriers as well, IIRC) before and figured they were bringing massive amounts of extra backhaul to spots with big events.

I'm curious how these figures relate with what 'normal' towers have allocated. I've seen the rough 1 gbps figure before but don't know how accurate that is.

Re: Inside AT&T’s 83 GB/hour mobile cell tower

#13
post #6

This is pretty surprising that AT&T engineers were the ones to design the antennas. It is usually vendors such as Nokia-Siemens, Alcaltel-Lucent or Ericsson that provide the equipment and that have the antenna/radio know-how while on the operator side the engineers there focus more on optimization and RF planning, rather then the design.

If you watch the video of the two AT&T engineers, they basically say that they just had the idea; their (unnamed) vendor actually did the work to see if it was feasible and designed the antenna.

Re: Inside AT&T’s 83 GB/hour mobile cell tower

#14
what do the AT&T vans connect to? I assume that there is no landline available for them to hook into, so how are they providing service?

my guess is satellites or communicating with other cell towers but the latter seems counterproductive as it would push a high load to a different cell tower. but if they used satellites, wouldn't there by high latency and bandwidth limits?

Re: Inside AT&T’s 83 GB/hour mobile cell tower

#16
post #15

To convert to more normal units, that is about 189 Mbits/second. Which sounds a little less impressive considering the peak 4G speed is supposed to be 100 Mbit/second.

Doesn't 802.11n theoretically support 300 mbits/sec on a single 40mhz channel, too?

yes but the range that it will work over is significantly lower (iirc) without a lot of modification of the timing.

Re: Inside AT&T’s 83 GB/hour mobile cell tower

#18

To convert to more normal units, that is about 189 Mbits/second. Which sounds a little less impressive considering the peak 4G speed is supposed to be 100 Mbit/second.

I thought 83 GB/hr seemed like not much capacity, and indeed that really isn't much. I've seen these units (and from other carriers as well, IIRC) before and figured they were bringing massive amounts of extra backhaul to spots with big events. I'm curious how these figures relate with what 'normal' towers have allocated. I've seen the rough 1 gbps figure before but don't know how accurate that is.

83 GB/hr is not capacity that's actual usage. Considering the overheads involved I would not be surprised if this was 2-5 times faster in terms of raw bandwidth.

Re: Inside AT&T’s 83 GB/hour mobile cell tower

#19
post #14

what do the AT&T vans connect to? I assume that there is no landline available for them to hook into, so how are they providing service? my guess is satellites or communicating with other cell towers but the latter seems counterproductive as it would push a high load to a different cell tower. but if they used satellites, wouldn't there by high latency and bandwidth limits?

I've seen line-of-sight microwave used for similar needs, but not in built up areas.

Edit: clicking through and actually reading the link, the picture clearly depicts Microwave backhaul. Probably to a site in the vicinity they have a nice big land-based pipe.

Re: Inside AT&T’s 83 GB/hour mobile cell tower

#20

To convert to more normal units, that is about 189 Mbits/second. Which sounds a little less impressive considering the peak 4G speed is supposed to be 100 Mbit/second.

That's peak hour usage average, but I have to imagine the bursts were much higher. Not to say I disagree, doesn't sound all that impressive
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