This is not quite true. You need to stipulate the caveat that 10BaseT and 100BaseT Ethernet in *half-duplex* do not use all 4 pair. Full-duplex communication *does* require the additional pairs.
Rik
-----Original Message-----
From: David L. Blair [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 21, 2000 12:21 PM
To: "CCIE TB"
Cc: Cisco GroupStudy
Subject: Re: Why 8 wires in RJ-45?
Future Needs. You are right that 10BaseT and 100BaseT do not use more than
4 wires, but 100VGLAN and 100Base4 do. Those specifications used the extra
wires to transmit data at a slower speed. When you add up the additional
data lines multiple, 4, by the slower speed, 25Mb, you get 100Mb
transmission rate.
FYI: 100Base4 was designed to run 100Mb over Cat 3 wiring.
-dlb
----- Original Message -----
From: ""CCIE TB"" <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
Sent: Monday, September 18, 2000 10:39 PM
Subject: Why 8 wires in RJ-45?
> Hi group members
>
> In TP cables we have eight wires. Only four are used. Why we need the
other
> four. The same thing applies to DB-25 and other types of cables. We don't
> use all of the wires. Why?
>
> Regards to all
>
>
> _________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
>
> Share information about yourself, create your own public profile at
> http://profiles.msn.com.
>
> **NOTE: New CCNA/CCDA List has been formed. For more information go to
> http://www.groupstudy.com/list/Associates.html
> _________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
**NOTE: New CCNA/CCDA List has been formed. For more information go to
http://www.groupstudy.com/list/Associates.html
_________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
