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C/X and EPC/X host adapters and C/CON concentrators have been designed so that the synchronous ports can support either EIA-422 or EIA-232 line levels. Eight-Wire Synchronous Modem wiring allows concentrators to be installed in remote locations and connect to the host adapter via EIA-232 or EIA-422 synchronous modems, DSUs/CSUs, frame relay adapters, fractional T1s or ISDN terminal adapters. The EIA-232 synchronous modem cable is a twisted pair cable with a male HD-15 (high-density DB-15) connector at one end and a female DB-25 at the other end.