Cisco Headend System Release 2.5 User Guide
Chapter 1 Preparations to Add a BFS Carousel
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4011048 Rev B
Verify the Presence of a VCI for Inband BFS
Sources
Sources
Overview
Important! This procedure only needs to be completed if your system is based on the
traditional configuration that includes a BIG.
traditional configuration that includes a BIG.
The traditional configuration includes a BIG that sends data to a BIG QAM or Data
QAM. In this configuration, a media converter or an ATM switch resides between
the DNCS and the BIG. Because the media converter is a passive device, no special
configuration is necessary. When an ATM switch is used, each inband data carousel
requires its own virtual circuit indicator (VCI). This section describes how to check
the number of BFS sessions on your system to determine whether or not any unused
VCIs are present for the inband BFS carousel.
QAM. In this configuration, a media converter or an ATM switch resides between
the DNCS and the BIG. Because the media converter is a passive device, no special
configuration is necessary. When an ATM switch is used, each inband data carousel
requires its own virtual circuit indicator (VCI). This section describes how to check
the number of BFS sessions on your system to determine whether or not any unused
VCIs are present for the inband BFS carousel.
Your DBDS network was initially installed and reserved with 20 Virtual Channel
Indicator (VCI) connections (values 256-275) on the ATM switch. The VCIs are used
to carry inband BFS information from the DNCS to the BIG. Because you will be
creating a new inband source, you must make sure that a VCI is available for its use.
Indicator (VCI) connections (values 256-275) on the ATM switch. The VCIs are used
to carry inband BFS information from the DNCS to the BIG. Because you will be
creating a new inband source, you must make sure that a VCI is available for its use.
Checking the Availability of VCIs
Complete the following steps to determine if there are enough unused VCIs
available for the inband BFS carousel.
available for the inband BFS carousel.
Note: If you need detailed instructions for this procedure, refer to the manual that
came with your ATM switch.
1 Check the switch to determine the number of unused VCIs.
2 Are there enough unused VCIs for the inband BFS carousel?
came with your ATM switch.
1 Check the switch to determine the number of unused VCIs.
2 Are there enough unused VCIs for the inband BFS carousel?
If yes, go to Select a Source ID for the New BFS Source (on page 9).
If no, add more VCIs to the switch and then go to Select a Source ID for the
New BFS Source (on page 9).
Note: Having unused VCIs does not present any issues to your system;
therefore, Cisco recommends that you create 5 to 10 extra VCIs.
New BFS Source (on page 9).
Note: Having unused VCIs does not present any issues to your system;
therefore, Cisco recommends that you create 5 to 10 extra VCIs.