VITC is the "more accurate" form of timecode, in that you can play down to frames/fields when jogging, for instance, on a DigiBeta. VITC is part of the vertical interval, and thus cannot be read at very high rates of deck speed, just like picture can't be vividly read at high speeds. If you're sitting on a frame, VITC can still be read.
VITC complements LTC, which is typically part of the audio channel/bandwidth of the tape, and is only so accurate. The tape stops, and so does the audio and the LTC. Your timecode reader on the deck can show you both, and you can also see the VITC/LTC lights on the deck when they are active.
You control VITC placement in the deck menu, and make sure VITC is on. PAL is typically lines 19,21 for VITC, NTSC 16,18. You obviously don't want VITC creeping into active picture. Ideally, VITC is set with a space between, and not consecutive lines.
PHOTOS | VIDEOS | SOUND | ETC.