Patterns
Many test patterns are available to 'stress' the circuit in a unique way or to gain maximum insight into a particular problem. Much has been written to guide the troubleshooter to select the proper pattern. Below is a list of the patterns available in the test set.
- 2E6-1
- 2E9-1
- 2E11-1
- 2E15-1
- 2E20-1
- QRSS- A pseudorandom pattern that simulates live traffic on a circuit. It is a very common test pattern
- 2E23-1
- All 0's - A pattern that is often selected to verify HDB3 provisioning.
- 1:7 - An eight-bit pattern that contains a single 1. Used to test clock recovery.
- 1:3 - A 4-bit pattern with a single 1.
- 1:1 - A 2-bit pattern with a single 1.
- All 1's - A pattern that causes line drivers to consume the maximum amount of current. If framing is set to 'Unframed' the resulting pattern is equivalent to an Alarm Indication Signal (AIS).