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Integrated Channel Service Unit ICSU 120A2

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Definity ICSU plugs directly into system back-plane, plugs directly into the DS1 Circuit Card I/O connector
Compatible with DS1/ISDN PRI Trunk Circuit Card (TN767E) and Universal DS1/ISDN PRI Trunk Circuit Card (TN464F)
DS1 CPE loop-back jack required when network provider does not install a smart jack

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Integrated Channel Service Unit ICSU 120A2