Technical data

492 Chapter 18
T1 Analyzer
Making T1 Measurements
T1 Analyzer
• 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