I recently visit a jail cell site shared byClearwireand two other unknown aircraft carrier — without fry my nuts . We ’ve all driven past them so many times , but have you ever actually wondered how they work ?
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How They make
Whether it ’s do by simple earphone calls or 12Mbps WiMax data , cell internet site are organized with more or less the same flow :
• A cellphone or modem radios the nearest towboat , say , fundamentally , “ I ’m here ! ” When you make a call or logon , your speech sound then send a message via receiving set that ’s picked up by the antenna array .
• A telegram or fiberoptic line carries the call down to the wireless access dot , connect to a multi - port permutation .
• The call , along with many others , gets routed to a backhaul , unremarkably down to an cloak-and-dagger wired T1 or T3 line , but sometimes back up the mast to a powerful argument - of - sight wireless microwave transmitting aerial . They fall back to receiving set either when they do n’t have a ground connection , or when the earth connection wet-nurse .
• The incoming call or data comes back from the backhaul and up through the switch to the feeler , where it then hits your phone wirelessly , presuming your phone is still communicating with the same internet site . If you are move , then there ’s a handoff — a new but more or less superposable jail cell site transmits the data to your phone , once your phone checks in and says “ I ’m here . ”
All of this happens in the blink of an eye .
The Gear
Clearwire , who give me the term of enlistment of the cell web site duringmy WiMax test streamlet , is a new society , only just now deploying their electronic connection , one that is only focus on data , and not on voice calls . This mean they do n’t have a bunch of land site already establish like other carrier ( though their late acquisition by Sprint may vary this ) . But it also think of their cellular power train is modern and compact compared to the others .
For instance , the mail carrier whose name probably starts with A keep its gearing in a bunker like the Endor moon one that Han Solo & Co. were judge to bust into in Jedi . The backup battery must be enormous , because there ’s a sign on the door that says , “ Danger – Corrosive Liquids – Wear Protective Equipment . ”
Clearwire , by comparison , has a high - school footlocker for its gear — one that is built somewhere else and just trucked to the location . You attach it to the on - site ability , run lines and antennas up the mast , and either abscond the chump to a cementum fundament or to the side of a steel post , and voila , you are done . It uses two car battery for its backup office — enough succus to last six hour and they do n’t have to wear a hazmat case to serve it . ( It can also run off of a portable source . )
In this fussy site , the carrier whose name may start with a V had a set of three magnanimous footlocker , not the immense bunker that its competitor had , but a serious raiment nonetheless . As you plausibly opine , each mailman locks up its own adeptness , so I was n’t at indecorum to fully inspect the other guys ’ cogwheel — or even affirm their identities .
Clearwire also runs skinny fiberoptics up to the top of the tower , alternatively of the wooden-headed insulated Cu cables that the old male child ’ networks run . Again , this has more to do with newness than bare common signified , but it may imply cadre towers could be a little slender in the future .
So what happens up top ?
The real demystification was the antenna array itself . I for one did not jazz a bunch about how thing were set up , and now I have intercourse a tiny bit more , which I will apportion :
• The vast feeler masts can have multiple attack aircraft carrier , each with its own triangular platform and transmitting aerial array .
• The grounds the platform are triangular is so the 360 - stage coverage can be split into 120 - degree pie pieces , which — if you await closely — can be subdivide again into 40 - academic degree slices for increased , pinpointed coverage .
• If there ’s a blank disk - shape transmitting aerial among the regalia , it think of that the carrier has a line - of - sight microwave oven backhaul . Clearwire ’s can handle 80Mbps at the moment , but must be direct in line with another microwave antenna . ( Speaking of fried crank , I would n’t want to stand between two of those . )
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