Status Indicators

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E1 Pulses - The test set is receiving pulses at the receive jack. Frame pulses alone are not sufficient to activate this indicator. There must be pulses present in the payload field.
HDB3 - A HDB3 pulse pattern was detected on the incoming signal at the receive jack. Note that only certain patterns transmit HDB3 pulse patterns. The pattern must contain at least 4 consecutive zeroes before a HDB3 pattern is sent. The QRSS pattern will generate HDB3 while an idle E1 circuit transmitting all 1's will not.
Frame Sync - A frame sync pattern matches the one specified in the setup screen on the test set.
Pattern Sync - The received pattern matches the one specified in the setup screen on the test set.