Talk:Fast Ethernet

message: The intro claims full-duplex FE is called "200 Mb Ethernet". I'm not disputing that bidirectional bandwidth is 200 Mb but I've never heard anyone claim that FE should be called 200 Mb. I plan to remove the statement unless someone steps up to substantiate it. --Kvng (talk) 16:01, 5 May 2010 (UTC)
thread_title: 200 Mb Ethernet

message: added coverage of 100BASE-T1. Thanks for that. Is this the IEEE version of BroadR-Reach? ~Kvng (talk) 13:43, 5 October 2016 (UTC)
replies: text: Pretty hard to find, but I just found a source - will be added in a moment. --Zac67 (talk) 18:11, 6 October 2016 (UTC)
replies: text:  "3 bits per symbol (PAM3)". Is that true? Ternary signal says that the 3 in PAM3 means 3 signal states, not 3 bits.--Heron (talk) 13:53, 15 July 2019 (UTC)
replies: text:  You're right that it didn't make sense that way. Each 3-bit symbol is transmitted as a pair of ternary PAM3-codes (three voltage levels). Check Clause 96.3.3.1. --Zac67 (talk) 16:44, 15 July 2019 (UTC)
thread_title:  100BASE-T1 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: From IEEE 802.3-2018 Section 21 "Introduction to 100 Mb/s baseband networks, type 100BASE-T": "100BASE-T uses the existing IEEE 802.3 MAC layer interface, connected through a Media-Independent Interface layer to a Physical Layer entity (PHY) sublayer such as 100BASE-T4, 100BASE-TX, or 100BASE-FX."
Notice the that standard explicitly mentions "100BASE-FX"; in fact, if you read carefully, you will see that the 100BASE-T section doesn't say anything about twisted pair as a medium or the PMD (Physical Medium Dependent) subsystem of the PHY. This is very confusing, because the same standard states in Section 1.2.3 "Physical Layer and media notation": "...additional distinctions are “T” for twisted pair...". Never the less, 100BASE-T as it is described in IEEE 802.3-2018 is really more of a common super class (in programming terms) of the more concrete 100BASE-T2, 100BASE-T4, 100BASE-TX and 100BASE FX (100BASE-X being a common super class of 100BASE-TX and 100BASE FX).
Contrast this with 1000BASE-T (Gigabit Ethernet) which explicitly makes reference to twisted pair while Section 34 "Introduction to 1000 Mb/s baseband network" defines properties common to all 1000BASE physical layer and media types, effectively fulfilling the role of 100BASE-T in the 1Gb/s space. In this case, the "T" in "1000BASE-T" is clearly related to twisted pair.
https://en.wikipedia.org/wiki/IEEE_802.3
Semanticscribe (talk) 13:51, 7 October 2021 (UTC)
replies: text: Interesting find. However, I wouldn't put too much weight on that. 100BASE-T is used as an umbrella term for what is normally called Fast Ethernet. In common usage, 100BASE-T definitely refers a twisted-pair variant, most prominently (and ambiguously) to 100BASE-TX. In fact, 100BASE-TX and 100BASE-FX are very similar apart from the copper vs fiber fact (-TX just adds scrambling to remove DC bias) due to both being derived directly from FDDI. --Zac67 (talk) 17:42, 7 October 2021 (UTC)

text: Fast Ethernet#Copper says  I have marked the statement as . If this is not supported by IEEE 802.3-2018, we need to rework it or find a reliable source that supports it. ~Kvng (talk) 14:34, 10 October 2021 (UTC)

text: I found three sources that support the assertion that 100BASE-T is a basically synonym for Fast Ethernet with 100BASE-FX under that umbrella: , , . I think some rework of the  statement is needed. ~Kvng (talk) 15:48, 16 July 2022 (UTC)
thread_title:  Semantics of 100BASE-T 

message: I think the tables for "8P8C wiring (ANSI/TIA-568 T568B)" and "8P8C wiring (ANSI/TIA-568 T568A)" contain an error.
The differential pair 1 (blue) polarity is consistent with the other pairs in that table. - is blue and + is white/blue
I do not have an ethernet standard to confirm but the information i find online with consistency is the exact opposite. Only for the diff. pair 1.
Even though diff. pair 1 is not used for 100BASE-TX the notation in the table should be fixed imo Mtoaes (talk) 11:09, 6 December 2023 (UTC)
replies: text: 100BASE-TX doesn't use pair 1, so it's not in that standard. Looking at 1000BASE-T (IEEE 802.3 Table 40-12), pair 1 is defined with 4+ and 5- – I think we should stick with that here. --Zac67 (talk) 12:16, 6 December 2023 (UTC)
thread_title:  8P8C wiring polarity might be wrong