Cisco Model D-PCG1000 PowerKEY CAS Gateway Technical References

2 

 

4022448 Rev B 

 

Maintaining optimum system performance during system upgrades and 
improvements is vital to providing high-quality, uninterrupted programming and 
services to subscribers. This document provides a procedure for successfully 
moving existing set-top boxes to new QPSK modulators and demodulators on the 
DBDS in order to minimize disruption or degradation of services to subscribers 
during network upgrades and improvements. 

 

Several scenarios exist under which you would want to add or split QPSK 
modulators on your system. The following examples describe some common 
scenarios: 

 

Changing the RF combining on your network 

 

Upgrading your data network to add new services such as high-speed data or 
Voice over Internet Protocol (VoIP) services 

 

Achieving better balance and distribution of set-top boxes on your hubs or 
your QPSK modulators 

 

This document makes the following critical assumptions: 

 

You have decided that you need to split QPSK modulators on your network. 

 

You are preparing to split QPSK modulators on hubs running DAVIC only. 

 

You know what type of route you use (default or static) to send set-top box 
messages from the Digital Network Control System (DNCS) to set-top boxes. 

 

You have already configured your data communications including routes, 
routers, switches, and communications links. 

 

You have already configured your RF network. 

 

You know the IP addresses, MAC addresses, subnets, input attenuator levels, 
and frequencies you need to use for the new QPSK modulator. 

 
 

This document provides procedures for adding and splitting QPSKs in hubs that 
are running DAVIC only. If you are running both DAVIC and DOCSIS

®

 on the 

same hub, do not use this document to add or split QPSKs for the hub. Instead, 
contact Cisco

®

 Services for assistance.