ocr: ADAPTINGTO ISDN Terminal adapters (TA) S/T PC Serial TA NT-1 port ISDN phone B. S/T PC Serial port TA NTI ISDN phone à PC Serial port TA NT-I ISDN adapters D. PC ISDN NT-1 odopter AE ISDN phone PC ISDN NI-T adopter Figure 4: PC ISDN: support can be provided. by terminal adapters (TAs) a ISDN adapters. TAS conmert to or appear as a serial device tbat oypically mimics a modem m operation. ISDN adapters require austom device arivers
