User guide

MS-DMT Guide v1.04

Released 05-30-2014

issues. This configuration does however present the worst case as to PC sound device noise floor

and jitter and other PC based artifacts when testing is conducted using a laptop and AC’97 on-

board sound device which is always used in addition to the best case use of an external USB

sound device in all use of the HF channel simulator. Testing is conducted using Windows

XP/Home, Windows XP Pro/64 and Windows 7/64 where operating system latency issues are

mitigated, such as disabling wireless networking and all other offending items. All comments

regarding the software modem and the meeting of minimum performance requirements are in

reference to testing with the HF Channel Simulator as the control environment and the single

AC’97 on board sound device and minimum OS latency.