Cisco DNCS System Release 2.7 3.7 4.2 Design Guide
7-2
Frequently Asked Questions
4000438 Rev B
Questions and Answers
Introduction
This section provides the most frequently asked questions and answers about setting
up DOCSIS in a DBDS environment.
List of Questions and Answers
Is the DOCSIS cable modem that resides in the DOCSIS-capable DHCT
CableLabs Certified?
The cable modem in the DOCSIS-capable DHCT fully implements the DOCSIS 1.0
The cable modem in the DOCSIS-capable DHCT fully implements the DOCSIS 1.0
specification. At this time, there is no CableLabs certification process for DOCSIS
cable modem functionality embedded in a DHCT. Cisco has conducted extensive
tests to ensure that the DOCSIS-capable DHCT interoperates with any CMTS
qualified by CableLabs for DOCSIS 1.0 or DOCSIS 1.1 operation.
Since there is a DOCSIS modem in the DHCT, doesn’t that create a high-speed
Since there is a DOCSIS modem in the DHCT, doesn’t that create a high-speed
path directly to the TV? Won’t this provide an easy conduit for IP-streamed
movies?
There is no “direct” high-speed data path to the TV. IP data that is forwarded by the
There is no “direct” high-speed data path to the TV. IP data that is forwarded by the
internal cable modem must be processed by some application. This application may
be running on the DHCT or it may be running on a PC CPE that is receiving high-
speed data service through the DOCSIS-capable DHCT. The cable system operator
controls which applications can run on the DHCT.
Do both the DHCT CPE (RF) and cable modem (data) portions of the DOCSIS-
Do both the DHCT CPE (RF) and cable modem (data) portions of the DOCSIS-
capable DHCT have MAC addresses assigned to them?
Yes. The CM MAC address (or Ethernet MAC address) is derived by taking the RF
Yes. The CM MAC address (or Ethernet MAC address) is derived by taking the RF
MAC address and adding one (CM MAC = RF MAC + 1). The RF MAC address label
is located on the back panel of the DHCT. To confirm the MAC address, please refer
to the label found on the back of each DHCT. The arrow in the sample label below
points to the MAC address.
Note: You can also locate the CM MAC address and RF MAC address on page 3 of
the diagnostic screens, Versions and Serial Numbers. For more information, refer to
Understanding Diagnostic Screens for the Explorer
®
Digital Home Communication
Terminals Application Guide, part number 749244.
MAC Address