DS21448 interface equivalent, 3.3v e1/t1/j1 quad line interface.
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Four Complete E1, T1, or J1 LIUs Supports Long- and Short-Haul Trunks Internal Software-Selectable Receive-Side Termination for .
It incorporates four independent transmitters and four independent receivers in a single 144-pin PBGA or 128-pin LQFP p.
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