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posted by martyb on Wednesday September 04 2019, @05:55AM   Printer-friendly
from the Waiting-for-Godot,-again dept.

As reported at C|net, USB4 is ready to go.

USB4 is done, the group developing the next version of the immensely successful USB connector technology said Tuesday. USB4 doubles speeds compared to today's fastest USB 3.2 by incorporating Intel's speedy Thunderbolt technology that you already see on high-end laptops and peripherals. The USB Implementers Forum announced the completion of the technical specification Tuesday, a move that frees hardware and software engineers to get cracking building the actual products to support it.

Today's USB 3.2, which enables data transfer speeds up to 20 gigabits per second, is still something of a rarity; most of us have earlier versions of the technology that works at 5Gbps or 10Gbps. USB4 promises a speed boost to 40Gbps, helpful for things like using multiple external displays or fetching files from external hard drives.

What is the Serial Bus equivalent of, "Looks like I'm going to have to buy the White Album again."?

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  • (Score: 2) by pipedwho on Thursday September 05 2019, @02:44AM

    by pipedwho (2032) on Thursday September 05 2019, @02:44AM (#889820)

    Also keep in mind that in the early '80s with the Bel202/CCITT-V23 half duplex standards, there was the capability of using a 1200/75 baud modem split rate that many modems supported. This standard could be used for 600/600, but more commonly was used at 1200 baud down and 75 baud up). This was mainly to cater for the asymmetric needs of most terminal systems where the screen needed to update much quicker than data would be sent back (typed) to the server system.

    75 baud is approximately 115 wpm. A fast typist can definitely cross that boundary sustained, but even a mediocre typist can type short bursts that exceed that rate. I remember using terminals 'back in the day' where you could easily type a word or two very quickly and have to wait for the buffer to catch up before you risked overflowing it. Same problem with IBM Selectric (electric golf ball) typewriters - they were fast and could keep up at 140 wpm sustained, but you could still type in bursts that it would have to buffer.

    300baud was pretty much impossible to out-type anything more than a couple of characters in a quick typing burst - like hitting adjacent keys almost simultaneously. Keyboard debounce also maxed out at around 50ms or just over 160baud or 200wpm, so the keyboard couldn't even keep up with the 300 baud modem. But, 75 baud was definitely a noticeable slow down for a quick typist.

    A few years later once 1200 and 2400 baud full duplex became popular, error correction such as V22bis was introduced into the standards. This could potentially slow things down if there was a lot of line noise, but for normal mostly quiet lines, they sustained their advertised rates. There were no modem based error correction protocols back in the days of 300 baud systems. So the sibling commenting on error correction causing extreme slow downs (to below typing speed) is only valid for faster modems and VERY noisy lines.

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