From Strat Ops, pg 168:
A full-strength Technical Team consists of one tech and six semiskilled astechs. Such a team is commonly assigned to work on a specific ’Mech (a BattleMech or IndustrialMech), Point of Proto-Mechs, a vehicle or a battle armor unit. A Technical Team assigned to support conventional infantry can support up to four units.
Two (related) questions:
What constitutes a BA "unit"? For example, is it a Star of Clan BA troopers, a Point, or a single trooper and his suit?
The same goes for conventional infantry: does a "unit" mean a single person, a single squad, a single platoon, or some higher level or organization?