Dennis Olesen wrote:
> Jeg mangler noget info om 1000baseT og 1000baseTX. Jeg har søgt via google
> men har ikke fundet det jeg søgte.
>
> Jeg mener 1000baseT køre 500 Mbps i TX og 500 Mbps RX, hvor 1000baseTX er
> rigtig giganet. Her jeg ret eller har jeg misforstået noget.
>
> Hvis der er nogen som har et godt link om dette emne ville jeg blive glad fo
> få det.
>
Hej Dennis
Kig på:
http://www.certiguide.com/netplus/cg_np_1000BaseTXTheLatestUTPEthernetStandard.htm
Citat: "...The 1000BaseTX (sometimes called just 1000BaseT)......"
1000baseTX kan sende op til 1 Gbit/s begge veje på samme tid, på de 4
parsnoede balancerede antennekabler i TP-kablet.
August 1998, Gigabit Ethernet over Copper (Cat 5 og Cat 6)
By Sailesh K. Rao and Juan M. Jover:
http://www.commsdesign.com/main/9808fe1.htm
Godt billede - et Gbit netkort er ret kompliceret og på trods af det
kan nyere Gbit netkort nøjes med en effekt på 1 Watt:
http://i.cmpnet.com/csd/gifs/9808fe03.gif
-
Gigabit ethernet over copper with a crossover cable (1000baseT):
http://logout.sh/computers/net/gigabit/
Citat: "...
You may have experienced not being able to connect two 1000baseT NICs or
two 1000baseT switch interfaces, using a normal crossed ethernet cable
[mon de mener 4 leder Cat 3?]. The reason you can't do this, is that
1000baseT use all four wire pairs available in a Cat5 cable
...
Some smart 1000baseT interfaces (like the ones in Apple's G4 and G5
computers) don't need a crossover cable. They have something known as
"auto-mdix", which enable them to sense how the cable is wired, and
adjust to that.
..."
-
For at det ikke skal være løgn er man igang med at finde ud af at sende
10 Gbit/s over Cat 6 TP-kabler:
okt 04, 2002, Suppliers look to run 10-Gbit Ethernet over copper wire:
http://www.commsdesign.com/news/tech_beat/OEG20021004S0056
Cabling Installation & Maintenance May, 2005: 10-Gbit Ethernet over
copper: Reality, or not?:
http://cim.pennnet.com/Articles/Article_Display.cfm?Section=Articles&Subsection=Display&ARTICLE_ID=229017
Citat: "...
In October 2004, a milestone was reached when the task force published
the first draft 10GBase-T standard
...
*At least 55 meters on a ISO 11801 Class E/Category 6 UTP copper cabling
system (current Category 6-compliant solutions);
*Up to 100 meters on a ISO 11801 Class E/Category 6 augmented UTP copper
cabling system
..."
mvh/Glenn