Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 User Guide

With DOCSIS Set-top Gateway (DSG) support  you can deploy DSG-capable DHCTs. These DHCTs contain a cable
modem that operates with a CableLabs-qualified DOCSIS 1.0 and 1.1 and DSG Cable Modem Termination
System (CMTS). As a result, you can support IP-based, real-time, two-way communication between these
DHCTs and your headend and provide a faster out-of-band path for two-way services.  

For example, the Explorer 8300 can operate with any CMTS qualified by CableLabs for DSG operation. When
part of a CMTS, the Explorer 8300 operates in either of the following modes:

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Mixed DOCSIS/DAVIC communication mode - These DHCTs receive out-of-band data on a DAVIC

channel and unicast data on a two-way DOCSIS channel.

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DOCSIS communication mode - Unique code allows the DHCT to interpret the mode Mixed

DOCSIS/DAVIC and the mode DOCSIS as DOCSIS. When in DOCSIS mode, these DHCTs receive both
out-of-band data and unicast data on a DOCSIS channel.

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Note: DOCSIS is a CableLabs standard that enables data services to be provided over a two-way cable

system. DSG is a CableLabs standard that enables video signaling to be provided over a one-way or
two-way cable system.

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