ˌeɪtʃdˌiːˌɛlsˈiː ɪz ɐ bˈɪtˈoːɹiəntᵻd sˈɪŋkɹənəs dˈeɪɾə lˈɪŋk lˈeɪɚ pɹˈoʊɾəkˌɑːl ðæt wʌz ɚɹˈɪdʒɪnəli dɪvˈɛləpt baɪ ðɪ ˌɪntɚnˈæʃənəl ˌɔːɹɡɐnᵻzˈeɪʃən fɔːɹ stˌændɚdᵻzˈeɪʃən ˌaɪˌɛsˈoʊ.
HDLC is a bit-oriented synchronous data link layer protocol that was originally developed by the International Organization for Standardization (ISO).