Руководство По Проектированию для Cisco DNCS System Release 2.7 3.7 4.2
1-26
Introducing DOCSIS
4000358 Rev B
DHCT Communication Modes,
Continued
Receiving Communication Mode Upon Initialization
When a DHCT reboots, it attempts to establish an interactive connection using the
DCM and other parameters it used for its last successful connection. This reboot
process minimizes boot time by not requiring the DHCT to wait for a
UNConfigIndication message. Also, the expectation is that the vast majority of the
time when a DHCT reboots, it is in the same physical location. However, if the
DHCT establishes an interactive connection prior to receiving the first
UNConfigIndication and then discovers that the DCM in the UNConfigIndication is
different from that into which it booted, it must enter into that mode.
DAVIC Mode Operation
DOCSIS-capable DHCTs that receive a DAVIC DCM setting in the
UNConfigIndication message attempt to establish an interactive communications
path over the DAVIC channel. DBDS broadcast data traffic is received over the
DAVIC channel in this mode. DOCSIS-capable DHCTs in this mode do not attempt
to establish an interactive communications path over the DOCSIS channel.
Mixed DOCSIS/DAVIC Mode Operation
Mixed DOCSIS/DAVIC-capable DHCTs that receive a Mixed DOCSIS/DAVIC
DCM setting in the UNConfigIndication message attempt to establish an interactive
communications path over the DOCSIS channel only. DBDS broadcast data traffic is
received over the DAVIC channel in this mode. DOCSIS-capable DHCTs in this
scenario do not attempt to establish an interactive communications path over the
DAVIC channel.
DOCSIS Mode Operation
DOCSIS-capable DHCTs that receive a DOCSIS DCM setting in the
UNConfigIndication message attempt to establish an interactive communications
path over the DOCSIS channel. A DOCSIS-capable DHCT receives DBDS broadcast
data over the DOCSIS channel. However, for the DOCSIS-capable DHCT to receive
DBDS broadcast data over the DOCSIS channel, a DSG-compliant CMTS must send
the data. DOCSIS-capable DHCTs in this mode do not attempt to establish an
interactive communications path over the DAVIC channel.