ˈɔfən dᵻskɹˈaɪbd æz bˌiːɪŋ ɐ pɹəpɹˈaɪətɛɹi ɛkstˈɛnʃən, ðə diːtˈeɪlz ʌv sˈiː ˌeɪtʃdˌiːˌɛlsˈiː hɐvbɪn wˈaɪdli dˈɪstɹɪbjˌuːɾᵻd ænd ðə pɹˈoʊɾəkˌɑːl hˈæzbiːn ˈɪmplɪməntᵻd baɪ mˈɛni nˈɛtwɜːk ɪkwˈɪpmənt vˈɛndɚz.
Often described as being a proprietary extension, the details of cHDLC have been widely distributed and the protocol has been implemented by many network equipment vendors.