This is the format most networks require for any element loaded into it’s LMS system on Digibeta format.
First TC on tape at 58:00:00.
bars/tone from 58:30-59:30
black 59:30-59:50
:05 slate from 59:50:00 to 59:55:00 listing title, production company, house numbers, etc. Any sound here is purely for your own pleasure.
:05 black from 59:55:00-1:00:00:00
The commercial hits on 1:00:00:00 with a 4-7 frame fadeup, depending on your whim, or the creative of your spot. Some spots kick off with a flash, some fade up nice and slow.
Different library manement systems load in different ways. Some air spots digitally off of a server, some run automated tape loading systems. Some run D2, some run dbeta. The format above applies to all of them.
I will say that I delivered a spot that runs during a live unnamed show that had no slate requirements, delivery specs, and only wanted BetaSP format. They were, however, only airing this spot from playback and not an LMS, so they didn’t care.
Different networks and stations have different specs, however in my experience the above mentioned will make everyone happy. I’ve had enough coordinators freak out about not meeting those exact specifications that I’m happy to pass this hard earned lesson on to others.