The iPhone is a Class 12 device, meaning it can use up to four timeslots in one direction at a time.
Therefore the maximum it can go is 236.8 kbit/s.
End of story.
Actually that is true for EDGE but not for EDGE Evoluton. With EDGE Evolution there are multiple ways to achieve 1mps speeds with the current implementation of EDGE Evoluton on the ATT system is Higher Order Modulation: EDGE uses 8PSK modulation which encodes 3 bits per transmission step. Evolved EDGE introduces 16QAM modulation which can encode 4 bits per transmission step and 32QAM modulation which encodes 5 bits per step. In practice, however, 32QAM is difficult to use for average transmission conditions on the air interface.
Operation fine EDGE" as it was so put was just a marketing name given to ATT's first attempt at implementing EDGE Evolution. While only 4 timeslots on the down link are utilized, more data is transmitted per carrier downlink.
Before EDGE evoluton, the maximum downlink timeslots was and is 59.2 kps. With "operation fine edge" the downlink data per timeslot is about 79kps with a maximum of 315kps.
This is why people are averaging well over 200kps on ATT's EDGE network. With the old standard, with a maximum speed of 236kps, people were averaging around 150kps. Your not going to average 200kps with a maximum speed of 236kps unless your actually sitting on the towers.
And lets not forget that the iphone has WiFi, which is faster than 3g. I don't know about most of you, but I have WiFi just about anywhere I go, and with speeds between 200kps and 250kps EDGE browsing is just fine.
Copy and paste: Wouldn't let me attach.
3gamericas.com/PDFs/RIM_Pecen-MBA-Nov14-2007.pdf
