Method and system for transporting DOCSIS communication signals over a passive optical network
View Patent ↗A translation agent adapts DOCSIS information, primarily QoS information, for transmission over a PON. The agent places into an IP address field of a DHCP message the MAC address of an ONU associated with a CPE device attempting to register with a CMTS. The translation agent intercepts DHCP reply messages from the DHCP server using the MAC address of the ONU. The translation agent extracts information, including an IP address of the client CPE assigned by the DHCP server. The agent downloads a configuration file for the CPE device using the configuration filename and configuration file server contained in a DHCP reply message. Information contained in the configuration file is converted from content in a format used by DOCSIS, to content in a format used by PON devices. The translated content includes QoS parameters, functions related to which are controlled at the ONU by an OLT coupled to the CMTS.
1. A method for transporting DOCSIS information over a passive optical network, comprising:
identifying a optical network unit associated with a customer premise device that is attempting to register with a CMTS, wherein the customer premise device interfaces with the PON via the optical network unit and the CMTS interfaces with the PON via an optical line terminal;
sending DHCP discovery and request messages to a DHCP server, wherein the MAC address of the optical network unit associated with the customer premise device attempting to register is used in a client address field in the discovery and request messages; and
sending a reply message from the DHCP server that contains IP configuration information based on the MAC address of the optical network unit associated with the CPE attempting to register, wherein the reply message from the DHCP server comprises:
a management IP address for the optical network unit associated with the customer premise equipment device attempting to register;
a name of a configuration file associated with the optical network unit associated the customer premise equipment device attempting to register; and
an IP address of a TFTP server where a configuration file associated with the customer premise equipment device attempting to register is stored.
2. The method of claim 1 further comprising downloading the configuration file from the TFTP server to the CMTS using the management IP address for the ONU contained in the reply message as the address of the QMF agent.
3. The method of claim 2 , further comprising:
evaluating DOCSIS parameters in the TFTP configuration file with the QMF agent;
translating the DOCSIS parameter information into logical link identifier parameter information with the QMF agent;
sending the logical link layer parameter information to the optical line terminal via a logical control interface between the CMTS and the optical line terminal; and
managing bandwidth between the optical network unit and the optical line terminal based on the logical link layer parameter information without further involvement or the QMF agent operated by the CMTS.
4. A method for transporting DOCSIS information over a passive optical network, comprising:
identifying a optical network unit associated with a customer premise device that is attempting to register with a CMTS, wherein the customer premise device interfaces with the PON via the optical network unit and the CMTS interfaces with the PON via an optical line terminal;
sending DHCP discovery and request messages to a DHCP server, wherein the MAC address of the optical network unit associated with the customer premise device attempting to register is used in a client address field in the discovery and request messages;
sending a reply message from the DHCP server that contains IP configuration information based on the MAC address of the optical network unit associated with the CPE attempting to register;
downloading the configuration file from the TFTP server to the CMTS using the management IP address for the ONU contained in the reply message as the address of the QMF agent;
evaluating DOCSIS parameters in the TFTP configuration file with the QMF agent;
translating the DOCSIS parameter information into logical link identifier parameter information with the QMF agent;
sending the logical link layer parameter information to the optical line terminal via a logical control interface between the CMTS and the optical line terminal; and
managing bandwidth between the optical network unit and the optical line terminal based on the logical link layer parameter information without further involvement of the QMF agent operated by the CMTS.
5. The method of claim 4 wherein the reply message from the DHCP includes:
a management IP address for the optical network unit associated with the customer premise equipment device attempting to register;
a name of a configuration file associated with the optical network unit associated the customer premise equipment device attempting to register; and
an IP address of a TFTP server where a configuration file associated with the customer premise equipment device attempting to register is stored.