Cisco D9854, Installation And Configuration Manual, Page: 32 / 440

Chapter 1 Introduction
8
Disaster Recovery
In the event of a transmission failure on the primary feed, the disaster recovery
allows for continued programming, with limited to no downtime. The failure
condition could be triggered by one of the following events:

RF Lock Loss

Unstable RF signal

Transport Loss (RF locked, but no transport stream packets and NULL packets
received)
There are two types of disaster recovery implementations: Local or Uplink. Local
uses the disaster recovery settings configured on the D9854/D9854 -I receiver. Uplink
uses the disaster recovery profile settings configured on the PowerVu Network
Center (PNC). This is optional and PNC Software Version 12.5 is required.
Local Settings
The local disaster recovery settings are used if the PNC uplink is set to allow local
disaster recovery and the disaster recovery profile on the unit is set to local. Once the
receiver detects a failure after the configured signal loss timeout, it will initiate a
disaster recovery search based on the search path determined by the disaster
recovery configuration. A DR symbol is displayed on the front panel, and t he
D9854/D9854-I web GUI displays a D/R in progress status. During a disaster, the
receiver will attempt to tune to a different backup transport, based on the search
path configured. The origin transport consists of origin transport tuning parameters
and PE service IDs, configured in the Input menus. For more information on the
Input parameters, see
RF1, RF2, RF3, RF4 (RFx) Input (on page 77) for the front
panel, and Setting up the RF Input (on page 165) for the web GUI.
Note: If you perform a master PE channel change during a disaster recovery search,
the search will end, the current tuning parameters will be locked, and the current
channel will become the origin channel. If you perform a tuning change during a
disaster recovery search, the search will end, the current user tuning parameters will
become the origin tuning parameters, and the origin may be updated by any of the
NIT updates that follow.
For example, the disaster recovery is configured as follows:
Program
Entry Origin Transport
Channel Number Backup 1
Transport
Channel
Number Backup 2
Transport
Channel
Number Backup 3
Transport
Channel
Number
PE1 101 11 101 801
PE2 2 12 - 1005