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Request a Quote TN747B Avaya TN747B 8-Port Central Office Trunk Card The TN747B has eight ports for loop-start or ground-start CO, foreign exchange (FX), and Wide Area Telecommunications (WATS) trunks. Each port has tip and ring signal leads. It is compatible with trunk paging interface, and supports the abandoned call search feature in Automatic Call Distribution (ACD) applications (if the CO has this feature). The TN747B interfaces the Definity System or System 75. Avaya TN747B 8-Port Central Office Trunk Card