Historically, these types of vendor-differentiation features
have only been significantly developed on the CMTS. All current CMTS vendors have
product offerings, which they consider ???carrier-class, that provide varying levels of support
for the attributes listed here. The following sections provide details on the features
provided by the DOCSIS standards.
Standardized Services From the outset, the DOCSIS specifications were developed as
a multi-vendor standard for Ethernet transport across a hybrid fiber-coax wide area
network. Equipment that supports the L2VPN Business Services over DOCSIS feature
set can be used to provide seamless and secure Layer 2 virtual private network
capabilities that enable a transparent LAN service in point-to-point and multipoint
configurations connecting multiple customer locations. This is equivalent to the E-Line
and E-LAN service definitions defined by the MEF. Further, T1 circuit emulation over
Ethernet can be accomplished in a standard manner via equipment that supports the
TDM Emulation Interface specification in order to provide connectivity to a customer??™s
existing CSU/DSU equipment.
Scalability The DOCSIS specifications provide a scalable Ethernet transport platform,
with independently configured data rates currently ranging from 1 bps to 30 Mbps in
the upstream direction and 1 bps to 38 Mbps in the downstream direction.
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