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(100 ohms IN) ISDN U Interface Up to 1 km from Telco (100 ohms IN) Point-to-point NTU-1 connection (IS200A-R2) ISDN U Interface from Telco (100 ohms IN) NTU-1 (IS200A-R2) OVERVIEW ISDN service requires an NT1 to connect the terminal adapter to the ISDN line. If your terminal adapter doesn’t have a built-in NT1, the NTU-1 is your affordable choice.
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