Cisco DNCS System Release 2.7 3.7 4.2 Design Guide
4000358 Rev B
Introducing DOCSIS
1-7
Terminology,
Continued
Term
Definition
DOCSIS Media Access
Control (MAC) domain
Same as MAC-sublayer domain. As defined in the
Data-Over-Cable Service Interface Specifications Cable
Modem to Customer Premise Equipment Interface
Specification, SP-RFI-I06, the DOCSIS MAC-sublayer
domain is a collection of upstream and downstream
channels for which a single bandwidth allocation
and management protocol operates. Within a single
DOCSIS MAC-sublayer domain, each service ID
(SID) assigned to a cable modem must be unique.
DOCSIS Set-top Gateway
(DSG)
Functionality on the CMTS that encapsulates DBDS
broadcast data into an Ethernet frame with a well-
known Cisco MAC address before sending to the
DHCT.
Domain Name System
(DNS) Server
The Domain Name System (or Service) is an Internet
service that translates domain names into IP
addresses. Because domain names are alphabetic,
you can easily remember them. However, the
Internet is based on IP addresses. Whenever you
enter a domain name, a DNS server must translate
the name into the corresponding IP address.
DSG-capable
The ability in a CMTS to forward DBDS broadcast
data through the DOCSIS channel.
Dynamic Host Control
Protocol (DHCP)
Dynamic Host Control Protocol (DHCP) is a protocol
that allows you to assign dynamic IP addresses to
devices on a network. With dynamic addressing, a
device can use a different IP address every time it
connects to the network.
Element Management
System (EMS)
The EMS is an application that runs on a separate
workstation within the DBDS to monitor and
manage system alarms that occur for hardware
devices (network elements) in the DBDS.
Integrated Cable Modem
(ICM)
The integrated cable modem (or ICM) is embedded
in the Explorer 4200 DHCTs. These DHCTs can use a
DOCSIS channel and can be used for high speed
data service.