When you run the quiesce database command on a database that is being encrypted, SAP ASE puts the encryption process on hold.
You need not run the suspend encryption option of alter database after you run quiesce database; quiesce database automatically suspends the I/O operation on the database.
After the quiesce mode is released, the task of encrypting (or decrypting) resumes automatically; you need not run the resume encryption option in the alter database.