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warriorfootball9 · 08-26-2004, 8:10 PM

How does the cell phone tower connect to the main switching office? It some kind of internet connectin or what? Thanks for any information.

ShoresGuy · 08-27-2004, 6:35 AM

Quote:

Originally Posted by warriorfootball9

How does the cell phone tower connect to the main switching office? It some kind of internet connectin or what? Thanks for any information.

My guess is that they use some sort of microwave radio transmissions.

http://www.crowncastle.com/services/...missions.shtml

COtech · 08-27-2004, 7:12 AM

That's one way. More common is to have the ILEC put in (multiple) DS1 circuits between the cell sites and the MSO (switch). These circuits can be carried on copper wire; or via optical fiber (SONET rings) from a central office terminal to a remote terminal, then via copper. A DS1 carries twentyfour 64 Kbps DS0 channels, or 1.544 Mbps. With 9 to 14 Kbps per voice channels over the air interface, you'd be able to more than one call through a DS0.

Of course, all of these DS1s get delivered to the MSO together as DS3s (28 DS1s together), and larger aggregations.

COtech

warriorfootball9 · 08-29-2004, 6:11 PM

is 9 to 14 kps enough to carry a voice conversation?

bobolito · 08-30-2004, 11:18 PM

On a cell phone, that's the standard. That means you can put more than 24 conversations on a T1 (DS1) line.

(As suggested above, a DS1 circuit carries 24 channels).

Dogma · 08-31-2004, 9:27 AM

However, a T1 can carry far more than 24 calls depending upon what technology (CDMA,GSM,etc..) you are using. Having 24 DSO's (time slots) doesn't mean you only have 24 voice channels to work with.

08-26-2004, 8:10 PM	#1
warriorfootball9 Junior Member Join Date: Aug 2003 Location: Streetsboro, Ohio Posts: 121 Phone(s): Samsung X427 Provider(s): Cingular Wireless Devices: MP3, Palm Thanks: 0 Thanked 0 Times in 0 Posts My Auctions	Cell phone tower ? How does the cell phone tower connect to the main switching office? It some kind of internet connectin or what? Thanks for any information.

08-27-2004, 7:12 AM	#3
COtech Join Date: Sep 2002 Location: Memphis, TN Posts: 934 Phone(s): HTC Tilt 8925, Nokia 6555, NEC 525 HDM, Nokia 6340i GAIT Provider(s): AT&T Mobility Devices: MP3 player, WWVB wristwatch, TI-80 Thanks: 0 Thanked 8 Times in 6 Posts My Auctions	Re: Cell phone tower ? That's one way. More common is to have the ILEC put in (multiple) DS1 circuits between the cell sites and the MSO (switch). These circuits can be carried on copper wire; or via optical fiber (SONET rings) from a central office terminal to a remote terminal, then via copper. A DS1 carries twentyfour 64 Kbps DS0 channels, or 1.544 Mbps. With 9 to 14 Kbps per voice channels over the air interface, you'd be able to more than one call through a DS0. Of course, all of these DS1s get delivered to the MSO together as DS3s (28 DS1s together), and larger aggregations. COtech __________________ A SLA gets the trouble away!

08-29-2004, 6:11 PM	Original Poster #4
warriorfootball9 Junior Member Join Date: Aug 2003 Location: Streetsboro, Ohio Posts: 121 Phone(s): Samsung X427 Provider(s): Cingular Wireless Devices: MP3, Palm Thanks: 0 Thanked 0 Times in 0 Posts My Auctions	Re: Cell phone tower ? is 9 to 14 kps enough to carry a voice conversation?

08-30-2004, 11:18 PM	#5
bobolito iPhone 3G 16GB (White) Join Date: May 2002 Location: in front of my computer Posts: 12,539 Phone(s): iPhone 3G, Sierra 875 3G Aircard Provider(s): AT&T Mobility Devices: WiFi cards/Access points Thanks: 3 Thanked 17 Times in 14 Posts Images: 50 My Auctions	Re: Cell phone tower ? On a cell phone, that's the standard. That means you can put more than 24 conversations on a T1 (DS1) line. (As suggested above, a DS1 circuit carries 24 channels). __________________

08-31-2004, 9:27 AM	#6
Dogma Join Date: Apr 2004 Location: Minnesota Posts: 364 Phone(s): Moto Razr Provider(s): Alltel/Verizon Thanks: 0 Thanked 1 Time in 1 Post	Re: Cell phone tower ? However, a T1 can carry far more than 24 calls depending upon what technology (CDMA,GSM,etc..) you are using. Having 24 DSO's (time slots) doesn't mean you only have 24 voice channels to work with.

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