A.atm pvc0/33 aal5snap B.atm pvc33033 aal5snap C.atm pvc0/33 aal5snap ubr D.atm pvc33033 aal5snap ubr
A.28.8kbps B.56kbps C.128kbps D.1544kbps
A.line quality B.distance from the CO C.brand of xDSL modem D.number of twisted-pair wires used