Adtran ISU 512 ISDN Inverse Multiplexer. ISU 512 ISDN INV MUX 512K U INT BONDING V35 RS 530 RS 366 SYNC MUX. 4 x ISDN BRI (U) Network, 1 x DTE, 1 x DTE, 1 x DTE 512Kbps ISDN BRI


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