# AGAIN - trying to understand technical differences in Coax vs USB connection **URL:** \ **Category:** Audio Gear Talk\ **Created:** [September 22, 2018, 9:43am UTC](https://community.roonlabs.com/t/again-trying-to-understand-technical-differences-in-coax-vs-usb-connection/49713 "2018-09-22T09:43:40Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![andybob](https://community.roonlabs.com/user_avatar/community.roonlabs.com/andybob/32/109007_2.png) [@andybob](https://community.roonlabs.com/u/andybob)\ **Post date:** [September 22, 2018, 10:09am UTC](https://community.roonlabs.com/t/again-trying-to-understand-technical-differences-in-coax-vs-usb-connection/49713/2 "2018-09-22T10:09:10Z")
[This article](http://www.thewelltemperedcomputer.com/Intro/SQ/USB_SPDIF.htm) sets it out pretty well, gives a history and includes measurements. All modern USB connections are asynchronous. This post by Brian is also very helpful in understanding the various clocks involved: > [@RAAT and clock ownership](https://community.roonlabs.com/t/raat-and-clock-ownership/6915/38): > > RAAT is a network protocol. It delivers data from a server (the Roon Core) to a device–for example–in the purest case–a networked DAC. When we compare clock relevancy here, we are comparing apples to apples against other network protocols–many of which make the computer’s clock an inherent part of the audio chain in a way that RAAT avoids. When you start to insert additional elements–USB, or an S/PDIF generator, or a “USB re-clocker” or whatever–it’s important to think critically, thoroughly, … Edit: Corrected bad link. --- _[View the full topic](https://community.roonlabs.com/t/again-trying-to-understand-technical-differences-in-coax-vs-usb-connection/49713)._