Electronics > Beginners
LAN Connectors (terminology)
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Nusa:
I guess RJ45 is tribal knowledge, because the tribe invented it. It's not a standard, so the name is fair game, I guess. Even if it confuses people who stop to make sense of it.

If it WAS a standard, then you would be able to say that the designation was misused when it's not connected to the carrier network. But the tribe does this all the time. Since they are already wrong in those instances, why would we want to perpetuate this knowledge?

This is like getting people to stop using Kleenex and Xerox as generic names, even though the manufacturers would prefer you only use them to refer to the actual brand name. Ain't gonna happen.
tooki:

--- Quote from: metrologist on February 28, 2019, 07:19:31 am ---Nusa, It gets even more confusing if there is no RJ45 spec. For example, the RJ45S spec seems to include a physical key, so you can't use those dimensions. How is this tribal knowledge to be perpetuated once the wiki and connector mfgs change with the wind?
--- End quote ---
What makes you think the “wind” is changing? We moved to twisted-pair Ethernet in the early 90s, and there’s no evidence whatsoever of this changing any time soon.


--- Quote from: metrologist on February 28, 2019, 07:19:31 am ---tooki, There is no such thing as an RJ48C connector?

--- End quote ---
Nope. I don’t know any way to explain it other than what I’ve said already: RJ48C uses the 8P8C connector. But the 8P8C connector is NOT limited to RJ48C, so it’s not an “RJ48C connector”.


--- Quote from: metrologist on February 28, 2019, 07:19:31 am ---Sometimes nuance of language is irritating. Maybe it is a Port rather than a connector? It is labeled as "E1/T1 Test Port" and in the document it says RJ48C, but that is under a larger heading of all instrument connectors listing their type (USB, HDMI, PCIe, RJ48C, BNC, SMA, etc.).
--- End quote ---
I’d word it as “it’s an E1/T1 test port wired to the RJ48C standard”. “Port” indicating the function, and the “standard” defining the implementation, namely the connector and pinout.


--- Quote from: metrologist on February 28, 2019, 07:19:31 am ---It looks totally the same as the "RJ45" port you'd see for your laptop Ethernet, but that is not what it's for.

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Yup, because, as we’ve said repeatedly, the 8P8C connector has many different uses.


--- Quote from: metrologist on February 28, 2019, 07:19:31 am ---I presume this square hole meets the combined requirements you've mentioned?

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If it’s for a T1, it’s going to be RJ48C, if it’s for Ethernet, it’ll be T568B (or A). But since Ethernet is extremely consistent in using the T568B (and A) standard, saying it’s an [insert link speed here] Ethernet jack is sufficient to know what it actually means in practice.

Please, please, please, carefully read the “registered jack” wiki article I linked to earlier. I feel it explains all of your questions quite well, and we are all clearly going in circles.


--- Quote from: metrologist on February 28, 2019, 07:19:31 am ---There was a mistaken reference to RJ48C for the LAN port that instigated this.

--- End quote ---
So the device has both a T1 port and an Ethernet port? Then it probably explains the marketing intern’s confusion. :P They saw the T1 port correctly labeled as conforming to RJ48C, and they mistakenly assumed this was the connector name, and so when they looked at the Ethernet port with the same connector type, they assumed it was also RJ48C, which it isn’t.
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