Control Button Selections

Control Button Selections
On the Control button, the available buttons are unique to the test mode you select. Once you set up your display, you can change settings such as patterns, alarm injections, and so forth, while you make the measurement.
Pattern: Configures the test set to expect a particular test pattern. Many test patterns are available to 'stress' the circuit in a particular manner or to gain maximum insight into a particular problem.
Alarm/Error: Enables a list of available alarms and conditions that can be transmitted on the Primary Tx channel. The alarm or condition is invoked by pressing the Inject button.

To troubleshoot your T1 line, you can monitor for errors or alarms. Inject errors to see how the system responds.
- Loss of Signal Alarm - The test set ceases to send a signal.
- Loss of Frame Alarm - Forces the framing bit to always be set to 1.
- Yellow Alarm - The test set sends a Yellow Alarm. In D3/D4 mode, the test set sets bit #2 of each timeslot to 0. In ESF mode, the datalink bits are configured to send a repetitive pattern of 8 ones, followed by 8 zeros.
- AIS Alarm - The test set sends an AIS, or 'Blue Alarm', by sending an unframed, all 1s pattern (a constant contiguous stream of 1s).
- Idle Alarm - The test set sends a framed, all zero pattern. Note that the far end will interpret this as a Yellow Alarm.
- BPV Error - The test set forces a single, bipolar violation error with each press of the Inject button.
- Frame Error - The test set forces a single frame error with each press of the Inject button.

The test set forces a CRC error with each press of the Inject button only when ESF mode is selected.
The test set forces an error in the transmitted pattern with each press of the Inject button.

Fill Data: When performing Channel BERT testing, this configures the source of data transmitted in the unused slots. For drop-and-insert testing, this field is typically set to Secondary Rx.
- All 1's - Set this mode to maintain a sufficient 1s density on the unused channels during testing. All 1s are typically transmitted on unused channels in live T1 circuits.
- Idle - Set this mode to accommodate specific troubleshooting such as to exercise a circuit designed for B8ZS.
- Primary Rx - Fills the unused slots with Primary Rx data.
- Secondary Rx - Fills the unused slots with Secondary Rx data.
Inject: Causes the error or condition that is currently displayed on the button to occur. Some selections cause a single event to occur, while others maintain a constant state. The text on the button changes to reflect the appropriate action.
Loop Up/Loop Down: Available in emulate mode, these buttons enable you to manually put the test set into either loop up or loop down mode.
Send Loop Up/Send Loop Down: Available in emulate mode, the Send Loop Up button sends a loop up command to the far end. Send Loop Down sends a loop down command to the far end.