| 摘要 |
A cable modem supports two-way packet-switched traffic and is capable of telepho ny-type signaling to provide local telephone services over a two-way HFC cable network. The telephony-type signaling is transmitted using the TCP/IP protocol over an HFC di stribution plant. This telephony-type signaling includes representations of "off-hook," "on -hook," etc. At the customer's premises, the telephony cable modem takes any one of a number of forms. For example, the telephony cable modem comprises terminal equipment ports for coupli ng to both data terminal equipment such as a personal computer and voice terminal equipment such as a POTS telephone. Alternatively, the telephony cable modem includes POTS functiona lity and comprises a handset and keypad for dialing. As yet another example, the telephon y cable modem includes a terminal equipment port for coupling to data terminal equipment that also functions as a telephone, such as a personal computer equipped with a microphone and speakers. |
