- YTD421B
An Analog Driver/Receiver LSI for The ISDN BRI S/T Interface(???ISDN BRI S/T????????????/??????????? - YTD421B-E
ISDN driver/receiver - YTD423
ISDN BRI Controller With B-ch HDLC Controllers(????????????????????ISDN BRI????? - YTD423-S
Telecommunication IC - YTD426B
5.0V; ITCM ISDN U interface (TCM mode) - YTD426BS
Telecommunication IC - YTD427
ISDN Analog Front - YTD427F
Telecommunication IC - YTD428
ISDN Terminal Equipment - YTD42807
IDSU ISDN Terminal Equipment - YTD428S
ISDN Line Interface - YTD428_07
IDSU ISDN DSU for Terminal Equipment