Measurement Results

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Alarm indicators

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Signal Loss - The test set encountered the absence of 192 or more consecutive pulses. A frame pulse may or may not be present
Frame Loss - The test set encountered an unexpected frame pattern. The frame pattern did not match that selected in 'Setup'
Excess Zeros - The test set encountered the absence at least 16 consecutive pulses in AMI mode, or the absence of at least 8 consecutive pulses in B8ZS mode.
All Ones - The test set encountered an unframed, all 1s pattern (a constant contiguous stream of 1s). This pattern is also known as an Alarm Indication Signal (AIS), 'Keep-Alive Signal', or 'Blue Alarm'. Blue alarms are generated by faulty transmission equipment such a T3 to T1 multiplexers.
Yellow Alarm - A Remote Alarm Indication (RAI) signal pattern was received. This is normally sent by the far end interface equipment (CSU) in response to receiving a blue alarm on its network side. In D4 framing mode, a yellow alarm is created at the far end by setting bit 2 to 0 for 255 consecutive frames. In ESF, a pattern of eight 0s and eight 1s is repeated 16 times to indicate a yellow alarm.
Idle (CDI) - A Customer Disconnect Indication signal was received from the far end interface unit indicating that the customer is no longer supplying a signal. A CDI signal is an in-band pattern 0001 0100. Eight ones followed by eight zeros interrupted each second for 100 ms with LAPD Idle code (01111110) will be sent in the ESF Facility Data Link (ESF FDL).