This specification defines point-to-point and point-to-multipoint L2VPN configurations
that can be used to provide E-Line and E-LAN transparent LAN services. Data
privacy is ensured by the underlying link-layer encryption technology provided by
DOCSIS (56-bit DES or 128-bit AES).
Equipment built to support the L2VPN specification would be the most attractive to
use in providing Carrier Ethernet services.
The L2VPN specification has also been standardized in the International Telecommunications
Union as ITU-T Recommendation J.213.
TDM Emulation
To provide T1/E1 connectivity to customers over the DOCSIS network, a second Business
Services over DOCSIS specification, the TDM Emulation Interface specification has
been developed by CableLabs. Equipment built to support this optional specification
can be used to provide a drop-in replacement for traditional telco T1 or E1 service.
Carrier Ethernet Attributes
The Metro Ethernet Forum (MEF) defines five attributes of Carrier Ethernet:
?– Standardized services
?– Scalability
156 Chapter 6
?– Reliability
?– Quality of service
?– Service management
The DOCSIS specifications define certain features that are directly applicable to
these Carrier Ethernet attributes, while leaving significant room for vendor differentiation
and innovation.
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