ANSI SCTE 136-1:2019 pdf download.Layer 2 Virtual Private Networks for IP Cable Modem Systems.
ANSI SCTE 136-1 describes requirements on both CMTSs and CMs in order to implement a DOCSIS Layer-2 Virtual Private Network (DOCSIS L2VPN) feature.
The L2VPN feature allows cable operators to offer a Layer 2 Transparent LAN Service (TLS) to commercial enterprises, which is one of the principal goals of the Business Services over DOCSIS (BSoD) initiative.
In order to speed time to market, [L2VPN-DG] offers guidelines to CMTS manufacturers as to how to phase the implementation of requirements defined in this standard. Phase designations arc only applicable to CMTS products. Cable modems are expected to support all required L2VPN features in Phase 1.
The present document corresponds to and is the technical equivalent of the CableLabs CM-SP-L2VPN-l 15-150528 [L2VPN-I P].
1.1 Requirements
Throughout this document, the words that are used to define the significance of particular requirements are capitalized. These words are:
“MUST” This word means that the item is an absolute requirement of this standard.
“MUST NOT” This phrase means that the item is an absolute prohibition of this standard.
“SHOULD” This word means that there may exist valid reasons in particular circumstances to ignore this item, but the full implications should be understood and the case carefully weighed before choosing a different course.
“SHOULD NOT” This phrase means that there may exist valid reasons in particular circumstances when the listed behavior is acceptable or even useful, but the full implications should be understood and the case carefully weighed before implementing any behavior described with this label.
“MAY” This word means that this item is truly optional. One vendor may choose to include the item because a particular marketplace requires it or because it enhances the product, for example; another vendor may omit the same item.
Some normative statements require a CM or CMTS to silently ignore a condition which may be defined in future
standards. A requirement to silently ignore a condition means that the CM or CMTS:
• MAY increment a vendor-specific statistic;
• MUST NOT generate a log message; and
• MUST otherwise ignore the condition and continue operation as if the condition did not occur.
1.2 Conformance
A DOCSIS CMTS that claims to implement the DOCSIS L2VPN feature MUST implement the normative provisions of this document. A DOCSIS CM that claims conformance for DOCSIS L2VPN feature MUST implement the normative requirements of this document.
A CMTS or CM implementing this standard is said to be L2VPN compliant. For the remainder of this document, all references to a CMTS refer to an L2VPN compliant CMTS. A CM that has not implemented this standard is termed an L2VPN non-compliant CM.ANSI SCTE 136-1 pdf download.