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 send and expect to receive 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.
- Loss of Signal Alarm - The test ceases to send a signal.
- To troubleshoot your E1 line, you can monitor for errors or alarms. You can inject errors to see how the system responds.
- Loss of Frame Alarm - Disables the frame pattern.
- FAS Distant Alarm - Sets the Remote Alarm Indicator bit in timeslot 0 of the odd frames to simulate an FAS distant alarm.
- RAI Remote Alarm Indicator - See FAS Distant Alarm (above).
- MFAS Distant Alarm - Sets every sixth bit of each timeslot 16 in the zero frame to simulate an MFAS distant alarm.
- AIS Alarm - Alarm Indication Signal (AIS) sends an unframed, all 1s pattern.
- TS-16 AIS Alarm - Sets all bits in timeslot 16.
- BPV Error - The test set forces a single bipolar violation error with each press of the Inject button.
- FAS Error - Causes an error in the frame alignment signal.
- MFAS Error - Causes an error in the multi-frame alignment signal.
- CRC-4 Error - Causes the test set to generate a CRC error. Note that this is possible only when CRC-4 frame modes are selected.
- FEB (E-Bit) Error - Causes the test set to set the E bit on odd frames.
- Pattern Error - The test set forces an error in the transmitted pattern with each press of the Inject button.
Timeslot: Applicable only in the Channel BERT mode. Sets the active channel to be tested for BERT.
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 1's density on the unused channels during testing. All 1's are typically transmitted on unused channels in live E1 circuits.
- Idle - Set this mode to accommodate specific troubleshooting such as to exercise a circuit designed for HDB3.
- 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.