NEC Electra Elite IPK Programing Manual page 472

Elite IPK
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1. Assign a loop off-guard time to prevent system malfunction caused by noise when going off-hook to answer a call
from another system on a Tie line call.
2. The system ignores any noise that is detected during the time specified in this Memory Block.
3. This Memory Block affects T1 channels assigned as Tie/DID lines.
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Programming Manual
Notes
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