System identification number: Difference between revisions

Revision as of 04:53, 6 April 2007

Revision as of 23:33, 22 July 2007

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A '''System Identification Number''' is used to identify a cellular network in a certain area. The can represented by the [[acronym]] '''SID'''. It is a Global number to identify [[Base station|base stations]] for [[AMPS]], [[Time division multiple access|TDMA]] or [[CDMA]] networks. This number sometimes has conflicts (see [[IFAST]]).

==SID Codes==

These codes are 15/16 bit values and can be listed within a [[Wireless Device]] to show preference for one network over another.

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This number space is 90% utilized, however many countries do not use all of their allocated codes.

SIDSIDs isare assigned by [[IFAST]] to every carrier (e.g., Verizon, sprintSprint, Alltel). SIDSIDs isare programmed into the phone when you purchase/buy a planthem.

==How SIDs work==

When the phone is turned on, it listens for a signal. If it receives a signal, it looks at the SID (being carried by the signal), and compares it with the one that is stored in the phone. If they match, then you are in your home area. You are [[roaming]] if you are in an SID area that is not recognized by your phone.

A typical SID area is about 30 - 60 miles in diameter, but some may be as large as 200 or more miles.

When the phone is powered ON, it listens to SID. If it receives an SID, it compares with the one that is stored in the phone. You have service if there is a match. Else you are "roaming"

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