nanog mailing list archives
RE: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality]
From: "Naslund, Steve" <SNaslund () medline com>
Date: Fri, 27 Feb 2015 23:39:30 +0000
Sorry, no frequencies to play with on Ethernet. Ethernet is a baseband technology (i.e. DC voltage, not AC frequencies) One pair is transmitting, one pair is receiving in gigE. If you want to use both pairs in the same direction to double up the bandwidth, that could be done but it would not be Ethernet anymore. If you want to talk both ways on the same pair, that is half duplex, we've left that idea in the dust years ago. S
I don't mean to argue, as I am by no means an expert, but I'm pretty sure that 1000Base-T is 4 pairs bidirectional. Wikipedia may have lied to me, though. My >presumption is that anything supporting bidirectional communication on shared media can somehow shift that communication from symmetric to asymmetric >dynamically.
No you are correct that when you are talking about 1000Base-T you are talking about four pairs bidirectionally which is a departure from 10 and 100 mbps Ethernet. That does not change the fact though that it is a baseband technology. You can't dynamically change that and still call it Ethernet. You are free to invent a new standard but it would be hard to do that given that 10G is available for those feeling pain at 1G. Steven Naslund Chicago IL
Current thread:
- Re: Verizon Policy Statement on Net Neutrality, (continued)
- Re: Verizon Policy Statement on Net Neutrality Nick Hilliard (Feb 28)
- Re: Verizon Policy Statement on Net Neutrality John Levine (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Miles Fidelman (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Scott Helms (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Jack Bates (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Stephen Satchell (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Scott Helms (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Jack Bates (Feb 27)
- RE: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Naslund, Steve (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Jack Bates (Feb 27)
- RE: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Naslund, Steve (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Miles Fidelman (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Philip Dorr (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Mark Tinka (Feb 27)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Mike Hammett (Feb 28)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] James R Cutler (Feb 28)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Mike Hammett (Feb 28)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Stephen Satchell (Feb 28)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Mike Hammett (Feb 28)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Michael Thomas (Feb 28)
- Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] Mike Hammett (Feb 28)