Cisco Headend Digital Broadband Delivery System Guida Utente
4002178 Rev C
Channel Selection Options
3-19
Setting Up Dual Sources and Hiding Services from One-Way
CableCARD Hosts
Introduction
System operators have identified a need for CableCARD™ hosts to tune different
sources when a particular service is selected based on the capabilities of the host.
Fully interactive set-tops with a CableCARD slot can operate as a two-way
CableCARD host, while the majority of retail CableCARD hosts do not and are one-
way only. For example, the vast majority of CableCARD host televisions sold at
retail stores are one-way devices and cannot perform interactive services like VOD.
A new feature in the Digital Network Control System (DNCS) allows you to specify
A new feature in the Digital Network Control System (DNCS) allows you to specify
two sources for a single Service Application Manager (SAM) service. This feature
allows you to identify one source for two-way CableCARD hosts, as well as existing
set-tops with embedded security, and another source for one-way CableCARD hosts.
In addition to adding the ability to tune to a different source, a second capability has
In addition to adding the ability to tune to a different source, a second capability has
been provided. You can now hide services from a one-way CableCARD host. This
additional capability allows you to offer selected services to only the existing
embedded security set-top population as well as to the newer two-way CableCARD
host devices.
This section provides the procedure for specifying two sources for a single SAM
This section provides the procedure for specifying two sources for a single SAM
service. This procedure is useful when provisioning one-way CableCARD host
devices (for example, most retail televisions with CableCARD slots). A procedure for
hiding services from one-way CableCARD hosts is also provided. This procedure
does not affect services on two-way hosts such as newer CableCARD host-equipped
set-tops
How One-Way CableCARD Hosts Get Services
The DNCS builds the channel map (that is passed from the CableCARD module to
the CableCARD host) by looking for SAM services with a watchtv or music
application URL. Typically, any service using one of these URLs will be put into the
CableCARD channel map. The DNCS allows you to add an extension to the SAM
services application URL in order to cause one of the following behaviors:
•
•
The CableCARD host will tune to an alternate source ID when the service is
selected.
•
The DNCS will not include the service in the CableCARD channel maps when
they are built.
In addition, you can use this feature to prevent PPV and IPPV services from
displaying as "black screen" services on one-way CableCARD hosts. This condition is
prevented by modifying the URL for the event use service that is associated with the
PPV/IPPV service. As indicated earlier, these modifications only impact the service
information sent to one-way hosts.