en102
Canadian, eh?
join:2001-01-26
Valencia, CA
 ·RoadRunner Cable
 ·DSL EXTREME
| reply to pnh102
Re: GSM
Hack is a bit of a bad term for it.
CDMA is a spec for an air interface, as is TDMA and AMPS (analog)
CDMA2000(CDMA 1x/EVDO) use a 1.25MHz carrier channel and ANSI core (compatible with AMPS/TMDA)
UMTS/WCDMA uses a 5MHz carrier channel and MAP core (compatible with GSM)
UMTS/WCDMA is closer to EVDV, as it runs both voice and data over the 3G network.
With CDMA 2000, voice goes over 1x, data uses EVDO or 1x.
The main issue with UMTS/WCDMA is the size of the 3g voice/data channels. 5MHz is 'huge' (ie. 1 carrier hannel is the equivalent of PCS D license block) This poses problems for migration of users to 3G where spectrum is tight. Here in L.A., where 1 carrier channel was initially deployed, 3G was unusable for voice/data as it was typically overwhelmed.
In the end... AT&T just dropped the ball. |
