Talk:Ethernet over twisted pair

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[edit] Measuring throughput

Is the 10 Mbit/s measured in base2 or base10? That is, is it 10,000,000 bits/sec or is it 10,485,760 bits/sec?

It is most definitely base ten. All network communication is based on powers of ten. So, it's exactly 10,000,000 bits/sec.
Usually stated in millions (not 2^20) and almost always in bits per second. 10 or 10.5 doesn't really mean much, anyway, when you're talking about Mbps. Sln3412 06:16, 29 June 2007 (UTC)

[edit] Hardware

I suggest include a picture of the 10Base-T plug (wall plug) What year did 10BASE-T become the norm. We read 100BASE-T came in 1995.

Almost everything new is gigabit now. But think about it; a cable/dsl connection is not even 10 M, so if you're sharing a connection, a 10 hub is fine. Unless you're tranfering huge files on your home network a lot. New computers seem to be most often gigabit, and most stuff is now 100/1000 anyway. So, I'd say 100 or 1000 is now 'the norm'. No ref I can think of to add. Sln3412 06:16, 29 June 2007 (UTC)

[edit] RJ 45

As RJ 45 is not the correct name for the computer networking connector, or for that matter wiring diagram for the connector, all references to RJ 45 should be reviewed. —The preceding unsigned comment was added by 198.208.251.22 (talk) 18:36, 11 January 2007 (UTC).

Let me know what you think of the changes I made then. Yes, the connector is not RJ-45; the standard for the wiring is (at least under this topic) Sln3412 06:16, 29 June 2007 (UTC)

[edit] RJ 45 WTF?

If you don't call it RJ-45, what is it, then? All of my sources call it RJ-45, all of the techs call it that. Could you point to a source that calls it something else? My sources say the connector was designed by Ma Bell and that's the designation it was stuck with -- your phone cord connector is RJ-11. —Preceding unsigned comment added by 72.17.207.50 (talk • contribs)

It is an 8P8C FCC style modular connector. Read the 8P8C article for information on what RJ-45 actually is according to the standards. Plugwash 02:45, 1 March 2007 (UTC)
Yes. We call it RJ-45 when we're talking about networks, using EOTP , but the actual plug is 8 positions with 8 conductors. Some people call it Cat 5 or a patch cable, etc. Sln3412 06:16, 29 June 2007 (UTC)

[edit] proposed rearrangement

this article contains a fair bit of info that is applicable to all the twisted pair versions of ethernet, therefore i propose moving this to twisted pair ethernet, changing the redirects for all the variants of twisted pair ethernet to point here and then adding info here so it covers them all. Any objections? Plugwash 02:48, 14 February 2007 (UTC)

[edit] 1000BASE-CX and 10GBASE-CX4 are off-topic

neither of these protocols have anything to do with twisted pair.

Afaict 1000BASE-CX uses twisted pair while 10GBASE-CX4 uses twin-axial which according to our article is coax with the center core replaced by twisted pair. So in both cases the signals are travelling along twisted pairs albiet higher grade ones than those used for the more common variants of ethernet. Plugwash 13:01, 8 May 2007 (UTC)
Also think about the fact that we can compare and/or contrast to make a point about the actual subject. Mentioning some of the fiber standards etc to make a point about how copper differs. etc Sln3412 06:16, 29 June 2007 (UTC)

[edit] 8p8c is RJ-45

Also, CompTia uses RJ-45 on its tests. Just makes sense to refer to it as RJ-45, since that is the Network+ standard. —The preceding unsigned comment was added by 72.49.124.35 (talk) 16:59, 8 May 2007 (UTC).

They call it that because it's in the context of how the plug is used/called in networking. Sln3412 06:16, 29 June 2007 (UTC)


[edit] Cabling section

claims that Gig ethernet (1000BT) "requires a minimum" of Cat-5 - but IIRC, cat5e is typically the minimum used in this case. comments?--Boscobiscotti 18:55, 8 May 2007 (UTC)

iirc cat5 is the official minimum but in practice 5e is strongly reccomended. Plugwash 19:01, 9 May 2007 (UTC)
As I tried to say in the rewrite, what is in the standard and what works or doesn't can be two different things. Sln3412 06:16, 29 June 2007 (UTC)

[edit] Changes

I am rather short on refs in what I changed, but I've redone quite a bit to make it a little more exact.

RE 8P8C and RJ-45: T1 and ISDN use the 8P8C also. It's called an RJ-48 in that case. The 'RJ' refers to how it's wired. Let the links to the appropriate articles explain it.

'RJ' does refer to how something is wired, but the wiring to which RJ45 refers is not Ethernet. It's a rare modem wiring. There is no RJ standard for Ethernet (because it didn't originate with telephone companies). Bryan Henderson 02:42, 23 July 2007 (UTC)

RE Cat 5: Gbps works fine on it, usually.

RE Collision domains: Too much detail to explain here that the bits are .1 nanosecond at 10 megabits, nor to explain (nor why it is) that theoretically it takes electrons about 3 nanoseconds to go 100 meters, but is probably more like 10 to 15 ns through a physical medium. Links should explain all that also, not here in here; this is about Ethernet on twisted pair copper wires. It's like discussing the supposed propagation delay from Los Angeles to Manhattan (2800 miles, something like 1.5 ms) or why you can't compare ice cores to the atmosphere. Not important, doesn't fit the context. Sln3412 06:16, 29 June 2007 (UTC)

[edit] Flat cable modular plug vs. round cable modular plug

How does one visually tell the difference between a flat cable modular plug and a round cable modular plug? Sarsaparilla (talk) 01:04, 8 February 2008 (UTC)

Afaict it's just a case of whether there is enough space to get round cable into the back of the connector. What is more important afaict is making sure you get plugs designed for the right core type. Plugs designed for solid core will not be reliable on stranded core and vice-versa. —Preceding unsigned comment added by Plugwash (talk • contribs) 09:26, 8 February 2008 (UTC)