tə səpˈoːɹt mˌʌltɪpəl pɹˈoʊɾəkˌɑːlz ɛŋkˌæpsuːlˈeɪʃən, sˈiː ˌeɪtʃdˌiːˌɛlsˈiː fɹˈeɪmz kəntˈeɪn ɐ fˈiːld fɔːɹ aɪdˈɛntᵻfˌaɪɪŋ ðə nˈɛtwɜːk pɹˈoʊɾəkˌɑːl.
To support multiple protocols encapsulation, cHDLC frames contain a field for identifying the network protocol.