Cisco DNCS System Release 2.7 3.7 4.2 Design Guide
1-8
Introducing DOCSIS
4000358 Rev B
Terminology,
Continued
Term
Definition
Internet Control Message
Protocol (ICMP)
ICMP is an extension to the Internet Protocol (IP)
defined by RFC 792. ICMP supports packets
containing error, control, and informational
messages. The ping command, for example, uses
ICMP to test an Internet connection.
Media Access Control
(MAC) Address
The Media Access Control address is a hardware
address that uniquely identifies each node of a
Mixed DOCSIS/DAVIC-
capable
A feature of some models of the DHCT that allows
reception of DAVIC out-of-band data while
simultaneously using a DOCSIS channel for two-
way communication. For example, the Explorer 4200
DHCT is Mixed DOCSIS/DAVIC-capable.
Mixed DOCSIS/DAVIC
mode
A communication mode of the DHCT in which
DBDS broadcast data is delivered over the DAVIC
channel, and unicast data is delivered over the
DOCSIS channel
Network Management
System (NMS)
A network management system allows you to
manage the following areas of your network:
•
•
Security: Ensuring that the network is protected
from unauthorized users.
•
Performance: Eliminating bottlenecks in the
network.
•
Reliability: Making sure the network is available
to users and responding to hardware and
software malfunctions.
Non-DBDS traffic
Any data communications service that does not
require interaction with DBDS network elements, for
example, PC access to Internet (High Speed Data
Service).
Out-of-Band (OOB) Bridge The OOB bridge refers to the QPSK or CMTS RF
MAC domain.
PC CPE
A PC that is connected as CPE behind either a stand-
alone cable modem or a DOCSIS-capable DHCT.