Symetrix has an optional upgrade for users of the AirTools 6100 Broadcast Audio Delay.
The firmware upgrade adds a “user-specified offset to the TC89 (ESE timecode clock) output.”
This action, measured for anywhere from 0 to 60 seconds, is designed so that the studio clock displays the time in delay (TID) plus any uplink/downlink latency such as that from ISDN lines, codecs and satellite signals.
The upgrade requires service at Symetrix and costs $300.