| Thread Links | Date Links | ||||
|---|---|---|---|---|---|
| Thread Prev | Thread Next | Thread Index | Date Prev | Date Next | Date Index |
|
Gumersindo – Please answer these at your leisure. I am only writing them now because I don’t want to forget them. And thank you for the presentation. In your presentation, what I was asking is that I have seen that while media CAN be made to various bandwidths, the cost and yield is often dependent on the frequency range to which the medium is specified. For example, 2 GHz media may
be relatively lower cost than 4 GHz media. When we consider PHY proposals, the sensitivity of the PHY technology to the frequency bandwidth (and the quality of the medium in other respects) can impact relative cost of the total solution. As such, I was surprised
not to see it in the considerations. It may be particularly important on some of the lower speeds. You did have a consideration of test ecosystem. If the bandwidths are similar, most of phy tests are also similar – you just change the threshold. If you look across wireline PHYs in IEEE Std 802.3, you will see they generally use all
the same tests, just appropriate to the bandwidth and with their own limits. Hence test ecosystems are readily adapted. I am curious what part of the test ecosystem you were perceiving being difficult to meet. Also, from an 802.3 perspective, non-ethernet links are generally not in our scope; however, from the perspective of one who has developed a variety of PHYs, most of the PHY design isn’t specific to Ethernet. Most modern point-to-point
PHYs can be just as easily interfaced to a “raw” DLL similar to a SERDES. Generally, the prevalence of Ethernet has made it not necessary; however, if that is considered important, there isn’t anything obvious barring someone from adapting the transceiver
(PCS & PMA) of an Ethernet PHY to a SERDES DLL. George Zimmerman, Ph.D. President & Principal CME Consulting, Inc. Experts in Advanced PHYsical Communications 310-920-3860 To unsubscribe from the STDS-802-3-ISAAC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-ISAAC&A=1 |