said by coma9: said by Betamax76:
The HIGHER the Signal to Noise Ratio (SNR), the BETTER the signal. QAM-256 works with SNR as low as 33; for OOB (out of band) which uses different modulation, SNR can be as low as 15 to work well.
You'll get HD channel pixelation on 33dB, no questions asked. 15dB OOB and you'll get serious pixelation on VOD and slow IMG loading times. Don't know how long you've been working with VZ, but I've been here 6 years.
said by Betamax76:
The IMG lags he is experiencing are due to limitations in the QIP 7232 hardware design. Some will be solved with the introduction of Verizon's multimedia whole house server due out later this year.
Yeah, I'm pretty sure the 7232 isn't the problem. One of the newest DVRs Verizon has to offer, and has 512MB RAM. Even our newest Cisco box has 512MB RAM and is very comparable. The 7232 is our flagship at the moment.
OP, get a VZ tech out there to look at it, it should be a free visit. It can't hurt to have them look at it. If they charge you for the visit for what ever reason, talk to billing about getting it reversed, and 90% of the time they will.
If tech doesn't fix it, or can't, they won't charge you anyways. So it's a win/win.
Most OOB modulation is accomplished using QPSK or QAM-16. This works well with a SNR greater than 15 db because it has a high degree of forward error correction and can only send data at a relatively slow speed.
Unlike cable companies, the OOB tuner on Verizon's boxes does NOT effect VOD or IMG performance. These functions are controlled by the MOCA router at frequencies near 1 GHz. It is certainly possible that the original poster's MOCA transfer speeds are slow. He can determine his MOCA speeds using the hidden diagnostics. If he is using RG-59 cable or has damaged RG-6 cable or connectors, he certainly could have problems with only the MOCA frequencies, effecting IMG performance and VOD.
Fios uses the OOB tuner for channel authorization and the occasional firmware update. Cable companies rely on the OOB signal for program guide data, which is why it takes so long for their boxes to load guide information and boot up initially.
The QIP7232 may be the latest and greatest box currently available, but it was designed in 2010. As such, it has a single core processor. Any new boxes designed today will have at least a dual core processor. The TiVo Premiere, which became available in 2010, has a dual core processor, but when it debuted only one core was used until a software update was implemented. Dual and quad core processors lead to a much faster interface if the software is well written. Flash memory is limited to 64 MB in the QIP7232. Any dual core box will have at least twice that.