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Chapter 19: DOCSIS Set-top Gateway Configuration

STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

DSG Basic Mode — DSG operation without use of the DCD message. Set-top Gateways listen for packets with well-known

MAC addresses.

DSG Client — The destinations for the tunnel data within a DOCSIS Set-top Gateway.

DSG Client ID — An identifier that uniquely identifies a DSG Client. The DSG Client ID is unique per DSG Client, but is not

unique per Set-top Device as the same DSG Client which provides the same function may exist in multiple Set-top Devices.

In DSG Basic Mode, the DSG Client ID is a six-byte MAC address. In DSG Advanced Mode, the DSG Client ID may additionally

be a two-byte Application ID, a two-byte CA_system_ID, or a broadcast ID. The broadcast ID can be zero bytes for an

unspecified broadcast stream or two bytes to indicate the type of broadcast stream.

DSG eCM — The embedded cable modem (with modified initialization sequence, etc.) contained within a DOCSIS Set-top

Gateway.

DSG Server — Any server such as an Application Server or other network attached device that provides content that is

transported through the DSG tunnel to the DSG Client.

DSG Tunnel — A stream of packets sent from the DSG Agent in a CMTS to the DSG Client in a Set-top Device. A DSG tunnel

is identified solely by its DSG tunnel Address (destination MAC address). All of the packets of a given DSG tunnel use the

same DSG tunnel address. Different DSG tunnels use different addresses.

DSG Tunnel Address — The destination MAC address of the DSG tunnel.

Organization Unique Identifier — The first three octets of a MAC address. They are assigned to vendors by the IEEE.

Out-of-Band Messaging — The control and information messages sent from the Set-top Controller (or Application Server

or similar device for legacy OOB messaging) to one or more Set-top Devices. Specifically, OOB infers the use of a dedicated

channel for signaling which is separate from the video channels. This includes the following types of messages:

• Conditional Access (CA) messages including entitlements

• Service Information (SI) messages

• Electronic Program Guide (EPG) messages

• Emergency Alert System (EAS) messages

• Other generic messages

STB — Set-Top Box.

Well-Known MAC Address — The MAC address of the DSG Client within the Set-top Device. This MAC address has been

assigned by the manufacturer of the CableCARD or Conditional Access system within the Set-top Device, and has been

made known to the MSO for use in configuring the DSG Agent.

Arris C4C User Manual

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