16 channelized t1, e1 and t3 services overview, 1 t1 and e1 wan interface cards, Channelized t1, e1 and t3 services overview -30 – Riverstone Networks WICT1-12 User Manual
Page 634: T1 and e1 wan interface cards -30, Section 30.16, "channelized t1, e1 and t3, Services overview