ISDN U HDLC Interface 4-Line 4.096Mbps 3.3V 64-Pin MQFP
Quad 4-Pin QFP Surface Mount IC
4-Line ISDN U HDLC Interface IC, 4.096Mbps, 3.3V, 64-Pin MQFP
PEF24911HV2.2XT
Quad ISDN 2B1Q Echo canceller