1. Conformance
   1. Open standards
      1. IEEE 802.x
      2. DSCP
   2. Closed standards
      1. Aker Solutions
2. Functional
   1. Features
      1. Diffserv
      2. LAG
      3. IME
      4. Interfaces
   2. Levels
      1. Unit
      2. Integration
      3. System
         1. Solutions
            1. Acceptance
   3. Requirements
      1. White box
      2. Gray box
      3. Black box
3. Compatibility
   1. Interfaces
      1. Optical
         1. Bandwith1
         2. Bandwith2
   2. Network devices
      1. Switches
      2. Routers
4. Performance
   1. Load
   2. Responsiveness
   3. Capacity
      1. Speed
   4. Limitations
5. Regression
   1. Smoke
   2. Functional
   3. System
   4. ...risk based
6. Operation & Maintenance
   1. Configuration
   2. Monitoring
      1. Performance
      2. Notifications
      3. Logs
      4. Alarms
   3. Upgrade or replacement
      1. Software
      2. Hardware
7. Availability
   1. Systems
      1. Total system
   2. Sub-systems
      1. Branches
   3. Sets
      1. Pair
   4. Backups
   5. Upgrade
8. Security
   1. Passive
      1. Monitoring
   2. Active
      1. Attack
9. Environmental
   1. Temperature
   2. Moisture
   3. Vibrations
   4. Pressure
   5. Drop