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About 4ringsnbr

  • Birthday 06/08/1973

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  • Phones/Devices
    Motorola Droid RAZR MAXX
  • Gender
  • Location
    Baton Rouge, LA
  • Here for...
    4G Information
  • Favorite Quotation
    Those who can't compile their own kernel shouldn't operate a computer at all...
  • Interests
    cars, computers, yoga, wine, running, & exercise

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Member Level: 3G EVDO

Member Level: 3G EVDO (8/12)



  1. The power usage would only be greater during the SVDO operation. If you're not doing both together (like 99% of the time), the SVDO capability doesn't impact battery life.
  2. Yes-- SVDO or SVLTE does burn the battery faster, but generally these modes lower total power output to comply with the SAR testing limits. The FCC approval documents would show you under which modes / frequency combos the handset lowers the radio power in SVDO operation-- and some handsets MAY not have to. Regardless, you're powering two basebands and will use more power.
  3. Yeah-- I mentioned the SVDO testing and capability of the Viper when it was FCC approved back in January. The Qualcomm S3 SoC has a CDMA baseband integrated that processes the 1x (SMS / Voice) carrier while the MDM9600's LTE/CDMA baseband handles the EVDO 3G (or LTE 4G) data duties. I'm not sure if they use separate transceivers or combine in something like a Qualcomm RTR8605 used in the Thunderbolt (which also does SVDO). As long as they have two separate baseband processors, the radio parts aren't as big of a deal.
  4. I don't know that DO Advanced will do anything to the 1x carrier associations. It may, but as far as I know (based upon Qualcomm's limited publications) it only allows the network to switch your EV carrier-- there's no indication that it will affect your 1x carrier for phone calls.
  5. I agree-- and for the reverse link on EVDO Rev. A, we're limited to 8-PSK and 16-QAM on the forward link. The transmitted data far, far exceeds the amount actually processed and used in the device. I was merely pointing out that nitpicking the transmission rate versus the transmitted total is pointless. The ISP (Sprint in this case) like every other ISP I can think of uses the proper binary-based definition for network data transceived. I'm well aware of the IEC's introduction of the Mebi- and Kibi- SI prefixed in 2000 to try to "simplify" measurement of computer data; however, aside from hard drive manufacturers as pointed out in this thread, nobody uses this new "standard". The guy that is arguing is short-changing himself from Sprint's 300 megabyte per month data roaming limit anyway-- by my calculations, he would short-change himself by 14,572,800 bytes using his rather than Sprint's (and everyone else's) definition of KB, MB.
  6. Actually, the data transmission is modulated with CDMA, which means it is spread over 1.2288 mcps (far greater than the data rate). What they track is just as they state: 1KB = 1024 bytes, 1MB = 1024 KB, 1GB = 1024 MB. This is the data transmitted over the network. The same definition is used by AT&T U-verse, Verizon on their data plan usage widget, and Cox on their usage widget. As numerous people on this thread have tried to tell you, this is the proper (and billed) measurement for multiples of computer data. You're wrong.
  7. Robert, this is CDMA, not GSM! On CDMA, the handset controls the handoff entirely. The only thing the tower can do on CDMA is command the handset to reduce the transmit power when the handset is too close to the tower to rectify the near-far problem. DO Advanced will allow the network to finally force your handset to switch EV sectors/towers. For now, your handset will always pick the sector with the best Ec/Io. It can also hook up to 2 or more sectors simultaneously. When it switches, the network FOLLOWS it, never commands it to switch.
  8. Regardless of what you want to call it modulated or not, a kilobit (or kilobyte) as measured by Sprint or any ISP, is 1024 bits (or bytes) as noted above. And that is the proper unit of measure.... oh, and I did assembly and ML programming on 8-bit, 16-bit, and 32-bit processors.
  9. PRL is a binary file. It can be edited in QPST or some versions of CDMA workshop. These are specialty software tools from Qualcomm. Internally, the PRL is two databases: an acquisition records table indexed to a root record and a system table that is processed by a phone from top to bottom that directs it to scan various acquisition records for 1x then for EVDO carriers. I use QPST to modify existing (or create new from scratch) PRL files that can be loaded into any CDMA cell phone. For LTE phones, the SIM contains the PRL and is automatically updated by the network. It cannot (or should not) be loaded or modified in any other way.
  10. The 2^10 increment "stuff" is how the kernel network monitors actually count the bits at the software level. If they are now reporting wrong to artificially inflate the figures like the hard disk manufacturers started doing, "buyer beware". In the code, if you open a terminal emulator in android (or Linux) to look at the network interface status, it WILL count network transfers with kilobits as 1024 bits, etc. That's how computers work internally.
  11. Check the weblinked png drawing-- you'll find it doesn't match what the screen shows-- app bug in some versions. Network rates are always given in 2^10 increments rather than the 1000 between.
  12. I'm afraid some of you (especially those in Boston) have stumbled onto the dirty little secret with network vision. The 4G LTE and eHRPD network (where EVDO will connect also) will be using new NV backhaul. The old 1x / EVDO (but non-eHRPD linked) network will use the old, existing backhaul and network. This is why the radios may be done, but there is no PDN gateway to tie LTE and eHRPD into. What this means in those areas is that 3G only phones will continue to see the same relative network performance after the NV upgrade; however, LTE-equipped phones connecting to 3G (via eHRPD) or LTE will use the higher capacity backhaul network tied to the PDN gateway.
  13. Don't trust Wikipedia with everything. Network links are quoted in binary. If in doubt on Speedtest and other apps, change their reporting from kbps to mbps. You'll see that all of them figure 1024 kbps = 1 mbps. The only place of significance that uses the 1000 bits / kilobit (power of 10) is hard drives so they can sell you an inflated size.
  14. That's the way all LTE phones (at least all VZW LTE phones are). Go to settings, wireless & networks... On my MAXX, your choice is CDMA/LTE or CDMA only. Most people keep it on CDMA only unless they have a big battery like the MAXX-- I leave mine on LTE all day.
  15. The 2.5 GHz spectrum is not frequency divided-- there are no separate uplink and downlink channels-- a 1.4x1.4 or 10x10 or any such type of carrier is not possible here. Only TD-LTE (time duplexed) can be done here. This means a 20 MHz channel can be divided (in time) between up and down time slices-- but the same channel is used for both. The duplex is done like WiFi or WiMax today: 10 ms of upload, a 1 ms "guard", then 20 ms of download for example would be a 1:2 up/down TD-LTE channel.
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