If you're new the expectation is that you're going to suck it big time for about a year, but you have to show progression towards improvement. If you keep accumulating more opportunities than wins within the first year you may want to find another job before they ask you to resign. There are generally two ways they will let you know they are going to term you:
1) Ask you to quit so it doesn't look bad that you are getting termed
2) They put you on CA
From my experience, I've noticed that ETLs only go on CA if they are going to get fired. It is rare for an ETL to be put on a CA and then show amazing improvement. It happens but rarely. Putting an ETL on CA basically means they've tried to fix you but now they are going to start the process to terminate you. This process is lengthy as long as you don't help them - meaning don't lose your keys, lock the doors and set the alarm before leaving, follow all the rules, etc.
Also, a CA for ETLs is more paperwork than a CA for TMs. Meaning, district level personnel have to approve of the CA and the grounds for being put on a CA.