Руководство По Проектированию для Cisco DNCS System Release 2.7 3.7 4.2
1-10
Introducing DOCSIS
4000358 Rev B
Term
Definition
Stand-alone Cable Modem
(SCM)
The stand-alone cable modem is currently deployed
by cable service providers and Internet service
providers for high speed data service.
Subscribed PC CPE
PC CPE whose PC MAC address can be located in
the Back-end Server Database. When in this
subscribed state, the PC is assigned a public IP
address.
Time Of Day (TOD) Server The cable modem uses the TOD server to get the
current date and time to accurately time-stamp its
Simple Network Management Protocol (SNMP)
messages and error log entries.
Trivial File Transfer
Protocol (TFTP) Server
The cable modem uses the TFTP server to download
its configuration file.
Unicast Data
Data that is addressed to a single destination. This
includes, but is not limited to, unicast UNPassthru
messages from the DNCS to the DHCT, and unicast
data between an application running on the DHCT
and a remote host.
Unregistered Cable
Modem
A cable modem whose MAC address cannot be
located in the back-end server database. A cable
modem is unregistered only when the cable service
provider offers self-provisioning for cable modems.
In this case, the cable modem is assigned a
temporary net 10 private IP address.
Unsubscribed PC CPE
A PC CPE whose PC MAC address cannot be located
in the Back-end Server Database. In this case, the PC
is assigned a temporary net 10 private IP address.
Upstream DBDS traffic
Data that flows from DHCTs to DBDS network
elements to support interactive applications, such as,
VOD or PPV services.
Virtual Private Network
(VPN)
A secure network that is constructed by using public
wires to connect nodes. For example, there are a
number of systems that enable you to create
networks using the Internet as the medium for
transporting data. These systems use encryption and
other security mechanisms to ensure that only
authorized users can access the network and that the
data cannot be intercepted.