... Data interface type: V.24, V.35, V.36, X.21, RS-449, RS-485, EIA-530 and EIA-530A.(2) Generator ... (2.1) SYNCH modeClock source: Internal or external clockPhase relation between clock and data: ... clockPhase relation between receive clock and receive data: Equidirection or reverse direction.Clock Rate: ... ASYNCH modeThe rate and data are the same as those of the generator.(4) Testing pattern: ...