Which SWAN concentrator physical interfaces support a speed of 64 kbps or more? seenagape 9 years ago Which SWAN concentrator physical interfaces support a speed of 64 kbps or more? A.RS-449, V.35, X.21 B.RS-449, V.35, RS-232 C.RS-232, V.35, X.21 D.RS-449, V.35, X.25 ← Previous question Next question →