Have you considered HDLC or SDLC?
There's also LAP/D (Link Access Protocol, D-Channel).
Uyless Black's "Data Link Protocols" is always nearby on my bookshelf - you might find some useful material in there too (even peruse the TOC & research the different protocols)
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…