ocr: ISDNI EQUIPMENT AND REFERENCE NERFACES These devices of interraces NONHISDN equipment (TE2) are olten combined into one: unit Routerwm Plaint service blat (POTS) telephone terinat S/T sena. port adapter. intertace Modem Rinterface NTL Tinterfaco Uinterface - 16M.compauble Fax NT2IPBX) SDNequipment (TEL) E Fu S/T intertace ISDN Routerwih 5 intertace relepnones, ISONE port S/T/U intertace PCWILABUIEANA andtenninal adapter Figure 1. In this ISDN sile, the U: interjace is linked to a network fermtination (NTI) device, which provides an interjace that enables ISDN-capable devices d0 comnect 10 the ...