Cisco Headend Digital Broadband Delivery System
Chapter 2 Upgrading QAM Modulator Software
20
4003389 Rev B
Establish a Download Sequence
Introduction
This section provides guidance for establishing a sequence to follow when
downloading QAM software version 2.4 onto more than one QAM modulator.
downloading QAM software version 2.4 onto more than one QAM modulator.
Note: For more information about the DNCS and operating the DNCS software,
refer to the DNCS Online Help for your system.
refer to the DNCS Online Help for your system.
Establishing a Sequence for Downloading QAM Software onto Each QAM
Modulator
Modulator
CAUTION:
If downloading QAM software version 2.4 to more than one QAM modulator,
download the software to one modulator and verify its functionality before
attempting to download software to another modulator. Verifying the
functionality of one modulator at a time enables you to better isolate any
failures that may occur.
download the software to one modulator and verify its functionality before
attempting to download software to another modulator. Verifying the
functionality of one modulator at a time enables you to better isolate any
failures that may occur.
The order in which you download QAM software onto QAM modulators allows you
to verify that the download is successful before proceeding. Follow these guidelines
to establish an order in which to download QAM software version 2.4 to QAM
modulators. The method that you follow depends on the type of sessions that the
QAM modulator carries (xOD/VOD sessions or broadcast sessions).
to verify that the download is successful before proceeding. Follow these guidelines
to establish an order in which to download QAM software version 2.4 to QAM
modulators. The method that you follow depends on the type of sessions that the
QAM modulator carries (xOD/VOD sessions or broadcast sessions).
xOD/VOD Sessions
When upgrading QAM modulators that carry xOD or VOD sessions, we suggest that
you upgrade all modulators in one hub and verify the functionality of those
modulators before upgrading modulators in another hub.
you upgrade all modulators in one hub and verify the functionality of those
modulators before upgrading modulators in another hub.
Use the following guidelines to determine the order in which to upgrade modulators
within a hub:
within a hub:
If any QAM modulators act as spares, start by downloading QAM software
version 2.4 on these modulators.
version 2.4 on these modulators.
If your system does not have a spare QAM modulator, download QAM software
version 2.4 on the modulator carrying the fewest number of sessions.
version 2.4 on the modulator carrying the fewest number of sessions.
Continue downloading the software to modulators by working your way up to
the modulator carrying the most sessions.
the modulator carrying the most sessions.