The DOCSIS 3.0 specification has
SUPPORT FOR MANAGEMENT MESSAGE TYPES
defined 61 messages for exchanging management data between cable modems and a CMTS. The specification also provides a provision to extend this number up to 255. Management messages that are particularly relevant to IPTV implementations include the dynamic bonding change request, response, and acknowledge commands. A detailed description of all 61 management messages types is available in the specification on CableLabs Web site.
Examining the DOCSIS 3.0 Operations Support System Interface (OSSI)
The CM-SP-OSSIv3.0 document provides details on the various OSSI technologies.
DOCSIS 3.0 OSSI specification defines the requirements to support fault, configuration, performance, security, and accounting management functions. In addition to the various mechanisms used by previousFAULT MANAGEMENTversions of DOCSIS to identify, monitor, correct, and record faults, DOCSIS 3.0 also provides for some new features:
. A diagnostic log that records operational problems such as repeated cable modem initialization and registration details.
. Enhancements that identify and resolve issues related to new functionality integrated into DOCSIS 3.0.
The management of faults in a DOCSIS 3.0 environment requires the use of protocols such as the simple network management protocol (SNMP) in combination with a number of different types of event logging and recording mechanisms.
Note that Chapter 11 on IPTV network administration provides a description of the SNMP protocol.
As the name suggests this function ensures that CONFIGURATION MANAGEMENT configuration parameters are kept current and are suitable for the smooth operation of the network. One of the key differences to this management function when compared to previous versions is an updated configuration file structure. The parameters within the file itself have been adjusted to support DOCSIS 3.0 technologies such as IPv6, multicasting, and channel bonding. CableLabs has adopted 44
IPTV NETWORK DISTRIBUTION TECHNOLOGIES
existing standardized protocols to support the execution of configuration management within a DOCSIS networking infrastructure.
The purpose of this function is to use either IPDR orPERFORMANCE MANAGEMENTSNMP protocols to gather event and error data at the PHY, MAC, and IP layers of the DOCSIS protocol stack. This information is used to help engineers determine the overall health of the networking infrastructure.
This function is responsible for protecting various types ofSECURITY MANAGEMENTdata in particular access to SNMP traffic. This helps to strengthen the security aspect of DOCSIS by minimizing the risk of hackers using SNMP as a mechanismto damage a cable providers networking infrastructure.
This function is executed by the CMTS and its coreACCOUNTING MANAGEMENTresponsibility is to gather network usage statistics for individuals and businesses who have subscribed to one of the available services, such as high speed Internet access.
Once collected this usage information is passed to the billing system. The mechanismfor delivering subscriber usage billing records is facilitated through a schema thatincludes the use of a streaming protocol developed by the IPDR organization. Thisnetworking protocol has been designed to efficiently transport high volumes of XMLbased usage billing records over a Transmission n Control Protocol (TCP) networkconnection. To reduce the size of these records, CableLabs has additionally specifiedthe use of a compression mechanism called IPDR/XDR. As the name suggests this encoding format was developed by the IPDR organization and uses the External DataRepresentation Standard (XDR) coding format defined in RFC 1832.
Examining DOCSIS 3.0 Security Mechanisms The security mechanisms required to support communication between different devices across a DOCSIS 3.0 enabled infrastructure is described in CM-SP-SECv3.0. These various mechanisms help to ensure that subscriber’s privacy is not compromised and preventing theft of services such as IPTV. The core portion of the DOCSIS 3.0 security system is based on the Baseline Privacy Plus (BPIþ) scheme. The architecture of this scheme is logically portioned into two protocols.
SUPPORT FOR MANAGEMENT MESSAGE TYPES
defined 61 messages for exchanging management data between cable modems and a CMTS. The specification also provides a provision to extend this number up to 255. Management messages that are particularly relevant to IPTV implementations include the dynamic bonding change request, response, and acknowledge commands. A detailed description of all 61 management messages types is available in the specification on CableLabs Web site.
Examining the DOCSIS 3.0 Operations Support System Interface (OSSI)
The CM-SP-OSSIv3.0 document provides details on the various OSSI technologies.
DOCSIS 3.0 OSSI specification defines the requirements to support fault, configuration, performance, security, and accounting management functions. In addition to the various mechanisms used by previousFAULT MANAGEMENTversions of DOCSIS to identify, monitor, correct, and record faults, DOCSIS 3.0 also provides for some new features:
. A diagnostic log that records operational problems such as repeated cable modem initialization and registration details.
. Enhancements that identify and resolve issues related to new functionality integrated into DOCSIS 3.0.
The management of faults in a DOCSIS 3.0 environment requires the use of protocols such as the simple network management protocol (SNMP) in combination with a number of different types of event logging and recording mechanisms.
Note that Chapter 11 on IPTV network administration provides a description of the SNMP protocol.
As the name suggests this function ensures that CONFIGURATION MANAGEMENT configuration parameters are kept current and are suitable for the smooth operation of the network. One of the key differences to this management function when compared to previous versions is an updated configuration file structure. The parameters within the file itself have been adjusted to support DOCSIS 3.0 technologies such as IPv6, multicasting, and channel bonding. CableLabs has adopted 44
IPTV NETWORK DISTRIBUTION TECHNOLOGIES
existing standardized protocols to support the execution of configuration management within a DOCSIS networking infrastructure.
The purpose of this function is to use either IPDR orPERFORMANCE MANAGEMENTSNMP protocols to gather event and error data at the PHY, MAC, and IP layers of the DOCSIS protocol stack. This information is used to help engineers determine the overall health of the networking infrastructure.
This function is responsible for protecting various types ofSECURITY MANAGEMENTdata in particular access to SNMP traffic. This helps to strengthen the security aspect of DOCSIS by minimizing the risk of hackers using SNMP as a mechanismto damage a cable providers networking infrastructure.
This function is executed by the CMTS and its coreACCOUNTING MANAGEMENTresponsibility is to gather network usage statistics for individuals and businesses who have subscribed to one of the available services, such as high speed Internet access.
Once collected this usage information is passed to the billing system. The mechanismfor delivering subscriber usage billing records is facilitated through a schema thatincludes the use of a streaming protocol developed by the IPDR organization. Thisnetworking protocol has been designed to efficiently transport high volumes of XMLbased usage billing records over a Transmission n Control Protocol (TCP) networkconnection. To reduce the size of these records, CableLabs has additionally specifiedthe use of a compression mechanism called IPDR/XDR. As the name suggests this encoding format was developed by the IPDR organization and uses the External DataRepresentation Standard (XDR) coding format defined in RFC 1832.
Examining DOCSIS 3.0 Security Mechanisms The security mechanisms required to support communication between different devices across a DOCSIS 3.0 enabled infrastructure is described in CM-SP-SECv3.0. These various mechanisms help to ensure that subscriber’s privacy is not compromised and preventing theft of services such as IPTV. The core portion of the DOCSIS 3.0 security system is based on the Baseline Privacy Plus (BPIþ) scheme. The architecture of this scheme is logically portioned into two protocols.
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