NEC Electra Elite 48/192 Features And Specifications Manual page 398

Electa Elite
Features and Specifications Manual
General:
ISDN Trunk DTMF Duration/Interdigit Selection is effective after
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Answer Supervision is received from the CO.
When an ISDN line Layer 1 or Layer 2 down condition occurs, the CO
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line key red LED is on, and the following message is displayed on the
second line of the LCD of the Multiline Terminals connected to Port
01:
Layer 1 Down: COxx Layer1 DOWN
Layer 2 Down: COxx Layer2 DOWN
Note: xx represents the CO Trunk number (01-64).
Note: Layer 1 down display has a higher priority than Layer 2 down. This error display
disappears automatically when Layer 1/Layer 2 error is recovered. The T1 line
error display has a higher priority than ISDN line Layer 1/Layer 2 down.
Issue 6
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