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ISP Information:
This is SCSI that communicates twice as fast as standard SCSI-2. Normal Ultra-SCSI transfers data at 20MBps, and Wide Ultra-SCSI transfers data at 40MBps. Similar to Ultra-IDE, Ultra-SCSI works its magic by transferring data on the up AND the down stroke of a clock cycle, doubling throughput.
ISP Glossary:
Ultra SCSI - E. Kunze wrote:Now let's discuss the SNR value. I believe that this Signal to NoiseRatio should be large to get a good connect speed. (Funnily, Modem_Breports SNR 0.0 ).My records show, that the 33.6k connects happen with a SNR below 40,whereas the 44k and 45.3k connects generally show a SNR of over 43.That is true, but not for the reasons you think. The channelused to measure SNR is entirely different with a v.34 connectionthan it is with a v.90 connection. In my previous article Iexplained that in some detail, so I won't go into that here.Suffice to say that with v.34 it *impossible* to have a real SNRof greater than approximately (plus or minus 1 dB) of 37 dB.That is due to quantization noise on the digital carrier channelbeing measured between the two modems involved..With a v.90 connection there is no quantization noise, and thechannel being measured is only your local loop, from the linecard at the telco to your modem. Typically with an SNR lowerthan about 45 dB on that loop you modem will have difficultyconnecting with v.90 protocols. A good high speed connectionmight show SNR figures larger than 50 dB.As I understand it, SNR ratio low may point to- a low signal on an excellent line with low noise, or to- high noise amplitude with a good signal. Both would make a good datatransmission difficult.That would be true. Also it should be noted that the "noise"can be random variations in the voltages produced the the linecard. Telco line cards use very cheap codec's. (Technicallythat is a "high noise amplitude with a good signal".To add: I did use a Conexant internal modem for some time, and thebest connects I got were 44k. Unfortunately, I didn't see a way to askthat modem for any data about the connection properties. Looks likethis feature was deleted in Winmodems?Now lets look at the aty11 values. I didn't quite understand Floydsexplanation of how we arrive at these values and what they actuallyI could put some time into a better explanation with enoughdetail to have it make sense... but you probably don't reallywant to know!mean. I would think that the modem sent out signals of the respectivefrequencies and determined the amplitude with which they came back,thus computing a ratio in dB.It's not clear to me, which data exactly the modem uses to decidewhich protocol to try for a connection.As I see two distinct groups of aty11 values, the lower always withlower connect speeds, I do think that there is an instabilitysomewhere in the chain.Yes, you have enough noise to make it borderline as to whetheryou'll get a v.90 or a v.34 connection.--Floyd L. Davidson Ukpeagvik (Barrow, Alaska) floyd@barrow.com
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