Installation Guide

4002804 Rev C QPSK (Release A63) Software Upgrade and Installation Instructions 13
The Upgrade Process, Continued
Is Service Impacted During the Upgrade?
The service impact to subscribers will vary based on the applications installed on
your system and how the applications react to a loss of both the forward and reverse
QPSK data paths. For a subscriber not actively using an interactive application the
outage will most likely go unnoticed.
System Requirements
The installation information in these instructions applies only to systems operating
SR 2.1.1 or SR 3.0.1 or later, and QPSK software version A47 or later. If you have
QPSK software version A34 or earlier installed on your system, you cannot directly
upgrade to A63. To upgrade from QPSK software version A34 or earlier, you must
first upgrade to QPSK software version A47, then upgrade to version A63 or later.
Call Cisco Services to obtain information about upgrading from earlier versions of
QPSK software.
To take advantage of variable-length subnet masks (VLSM), you must have
SR 2.1/3.0 or later installed. SR 2.1/3.0 utilizes the Solaris 8 operating system (OS)
that includes full support for VLSM. To optimize network configuration and to take
advantage of VLSM network technology, Cisco recommends that you modify all
applicable network configuration files on both the Digital Network Control System
(DNCS) and the Application Server when upgrading to SR 2.1/3.0.