Руководство По Проектированию для Cisco DNCS System Release 2.7 3.7 4.2
1-12
Introducing DOCSIS
4000358 Rev B
System Description,
Continued
DHCT Communication Modes
The following table describes each DHCT communication mode and the
communication interfaces required for each mode in the DBDS.
Mode
Description
DAVIC
All downstream communications (including DBDS
broadcast and unicast data) use the DAVIC out-of-band
channel. Upstream communications use the DAVIC
reverse channel. The DOCSIS channel is not used.
The DNCS administers the IP address for the DHCT
The DNCS administers the IP address for the DHCT
CPE.
The DNCS continues to use DSM-CC UNConfig,
The DNCS continues to use DSM-CC UNConfig,
UNSession, UNDownload, and UNPassthru messages
for DHCTs operating in this mode.
Mixed
DOCSIS/DAVIC
DBDS broadcast data communications use the
downstream DAVIC out-of-band channel, and unicast
communications use the DOCSIS bi-directional channel.
One or more DHCP servers administer the IP address
for the DHCT CPE. These servers are outside the DBDS
span of control.
The DNCS continues to use DSM-CC UNConfig,
The DNCS continues to use DSM-CC UNConfig,
UNSession, UNDownload, and UNPassthru messages
for DHCTs operating in this mode.
DOCSIS
All downstream communications (including DBDS
broadcast and unicast data) use the DOCSIS channel
through a DSG-compliant CMTS. The downstream
DAVIC out-of-band channel may be used for DBDS
broadcast data if the DOCSIS channel is impaired. One
or more DHCP servers administer IP addresses for the
DHCT CPE. These servers are outside the DBDS span of
control.
The DNCS continues to use DSM-CC UNConfig,
The DNCS continues to use DSM-CC UNConfig,
UNSession, UNDownload, and UNPassthru messages
for DHCTs operating in this mode.