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"N" |
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Term
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Non-facility Associated Signaling
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Definition
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NFAS - A special case of ISDN signaling in which two or more T1 PRI lines use the same D channel, and you can add a backup D channel. NFAS is required for switched-1536 data service; because all 24 channels of the T1 PRI line carry user data, the D channel must be on another line.
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Also
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