During suspension period, account will be locked temporarily at "1 reputation ". After completion of suspension period, reputation will be recalculated.
Quoting from official blog post:
Depending on the severity of the problem behavior — and at the
complete discretion of the moderator — your account will be placed in
timed suspension for anywhere from 1 to 365 days. That means:
- Your account will be locked at 1 reputation.
- Your user page will have a visual indication that you are in timed suspension, and for how long.
- You will be unable to vote, ask, answer, or comment.
At the end of this timed suspension period, your reputation will be
recalculated, and your account will resume as normal. We don’t hold
grudges. The point of all this is to address the behavior. If the
behavior improves, you are welcome back.
If suspended user receives upvotes to any of his posts, his rep will be added to previous rep. Whatever votes are cast, they are associated with posts. After end of suspension period, reputation is recalculated based on upvotes and downvotes of all posts of user. If the user has any invalidated votes, he won't get any rep for those votes as they are invalidated or no longer exist.
In your example, suspended user resumes at 1100.