David
100BaseT4 uses a standard RJ-45 connector with the same pinout as the
10BaseT specification, plus two bidirectional pairs (transmit on 1 and 2,
receive on 3 and 6; bidirectional on 4 and 5; bidirectional on 7 and 8).
Ajaz
""David L. Blair"" <> wrote in message
[EMAIL PROTECTED]">news:[
Title: RE: Why 8 wires in RJ-45?
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]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> HP 100VG was a short lived 100 mbps networking technology that used all
> eight wires. This enabled it to even run over category 3 cable as long as
> none of the wires was being used for phone services.
Ah, 100V
""¡Shawn.!"" <[EMAIL PROTECTED]> wrote in message
8q7lvt$16d$[EMAIL PROTECTED]">news:8q7lvt$16d$[EMAIL PROTECTED]...
> 100 Base T uses 2 pair (CAT 5)
Technically "100baseTX", no? I thought "100baseT" was a generic term
referring to either TX or T4. I'd also really like to know what the official
> 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
> >
> >
I was wondering
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
transm
Additionally, the new IP Phones from Cisco can utilize the 'extra' pairs to power the
telephones.
Frank Jimenez, CCIE #5738
Systems Engineer
Cisco Systems, Inc.
[EMAIL PROTECTED]
**NOTE: New CCNA/CCDA List has been formed. For more information go to
http://www.groupstudy.com/list/Associates
On Feb 8, 5:12pm, "CCIE TB" wrote:
}
} 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?
Because the standard actually comes from the telephony industry,
whe
, September 19, 2000 9:43 AM
To: CCIE TB; [EMAIL PROTECTED]
Subject: RE: Why 8 wires in RJ-45?
I have pulled Cat 5 cable, some 20 to 30 1000' spools,
in the last 2 years (about 5 miles of cable).
One time, on a run of about 500', I had a break in one
of the wires required for Ethernet.
Instead
I have pulled Cat 5 cable, some 20 to 30 1000' spools,
in the last 2 years (about 5 miles of cable).
One time, on a run of about 500', I had a break in one
of the wires required for Ethernet.
Instead of pulling the wire over again, I changed the
color coding at each end and had a working cable.
>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
>
For the RJ45 connector used with ISDN, the intention of the standards
bodi
100 Base T uses 2 pair (CAT 5)
100 Base T4 uses 4 pair (CAT 3 - 4)
"CCIE TB" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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-2
Some technologies do use all 8 wires. IE Gig E over copper uses all 4 pair.
At 10:36 PM 9/18/00 -0400, you wrote:
>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 a
I was wondering that myself.
Here are the top 10 possibilities, tung and cheek of course.
10) Copper mines are owned by Cisco!
9) It's a union thing, here's 20 bucks please don't ask again!
8) 4 more wires are there in case we forget the IEEE chapter of the
networking manual, whoops!
7) For colo
Where I work, we have many Terminals in use (Memorex/Telex). When the cables
for these were punchced down (Years ago), they decided to save money by
using 25 pair Cat5 and only punching down one pair for each terminal. Now we
are ready to upgrade to IP-based terminals (MTX 1683) and PCs in some ar
for support more application.
"CCIE TB" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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
>
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