Gigabit-how to know what you have?

How does one know what their cable is?
I remember that some of the cables I bought in the past were cat 5 or 6 but have no recollection of which was which and I threw out the packages.
If I set it for gigabye and only have cat 5 will it matter?
I am using a cable modem (in Japan) that is hooked to time capsule. Japanese web connections are super fast themselves--this is 30MB downstream and I used to have 100 with fiber optic. But as far as the cable I have no idea. Anyway to check?
Thanks

tokyoprogressive:
I don't think there is a way to tell by looking at the wires themselves. Sometimes the cable jacket, the gray plastic sheath around the wire bundle, is printed with a label that says CAT 5e. See the wikipedia link below to find out more and a list of other references. Or you can go directly to the Nihongo translation at
http://ja.wikipedia.org/wiki/カテゴリー5ケーブル
Smokerz wrote:
There is a difference between using Cat 5(10/100) , Cat 5e (10/100 and can do 1000 but not wide band and Cat 6 which does 10/100/100. User can check the lights on their router. For example I have a NetGear switch which shows one light if less than 1000.
Use can also go to System prefs/Network/Advanced/Ethernet and read the status. User can also launch Airport Utility to check speed status.
Smokerz:
I am not sure what you mean by wide band. Isn't gigabit all 1000Mbps and isn't Gigabit slang for 1000BASE-T? The following comes from Wikipedia.
WikiReference : http://en.wikipedia.org/wiki/Category5cable
Cat 5e cable is an enhanced version of Cat 5 that adds specifications for far end crosstalk. It was formally defined in 2001 in the TIA/EIA-568-B standard, which no longer recognizes the original Cat 5 specification. Although 1000BASE-T was designed for use with Cat 5 cable, the tighter specifications associated with Cat 5e cable and connectors make it an excellent choice for use with 1000BASE-T.
Also, I am a new Airport Utility user and i can't see how you find the LAN connection speeds. Can you tell me how?
Thanx
Tim

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