James, re your comment: "... It wouldn't take much to add an IP header to it.." That is what the 3GPP^1 has been working toward lo these many years and the standards are now emerging as the Long Term Evolution (LTE^2 ) technology for IMT-Advanced^3 (informally referred to as 4g) mobile networks, although some will argue that LTE is not a bonda fide 4g standard. The ruling paradigm of 4g is"all IP/all the time". WIMAX^4 which incorporates the IEEE 802.16e standard is an alternative 3g standard (protocol stack actually) that has been ratified by the ITU for inclusion in the IMT2000^5 family of 3G standards. WIMAX, because it also follows the "all IP/all the time" network design paridigm has many of the technical attributes of LTE. The IEEE is drafting a new standard within the 802.16 family, known as 802.16m which will juice up the payload data rate to the point that 802.16m^6 will be able to fit within the IMT-Advanced standards framework. If this standards "soup" sounds confusing it is because it is. The dailywireless.org article that I reference (6) has two nice graphics, one that shows the suitability of various protocol standards as a function of two variables, x = payload rate and y = degree of mobility require, and a second graphic that shows the evolution of mobile/wireless standards over time which is further down in the article. ^ 1. http://en.wikipedia.org/wiki/3gpp (see in particular the note regarding release 8 onwards) 2. http://en.wikipedia.org/wiki/3GPP_Long_Term_Evolution 3. http://en.wikipedia.org/wiki/IMT_Advanced 4. http://en.wikipedia.org/wiki/Wimax 5. http://en.wikipedia.org/wiki/IMT2000 6. http://www.dailywireless.org/2007/02/20/wimax-80216m-100-mbps/ Best Regards, John Holmblad Acadia Secure Networks, LLC James Knott wrote: > Gary wrote: > >> Joshua Layne wrote: >> >> >>> What frequencies would this radio support? (850,900,1700,1800,1900,2100) >>> (1700 and 2100 are data only) >>> What data standards? EDGE? UMTS? HSDPA? and on which of the above >>> frequencies? >>> >>> >>> >> Quad band phones are more common than they used to be but GPRS, even >> with EDGE, is too slow to carry VoIP traffic. >> > At work, we sell equipment that can do VoIP in under 20 KB/s, which is > less than what GPRS is capable of. Also, digital cell phone voice is > already in packets. It wouldn't take much to add an IP header to it. > > >
