Overview; Figure 2-1 Om 1000 Operational Flow Diagram - Motorola OM 1000 Installation And Operation Manual

Section 2

Overview

The Motorola OM 1000 creates a QPSK-modulated signal to carry the out-of-band (OOB)
datastream of a digital CATV system from the headend set-tops installed in subscribers' homes.
The OOB datastream is the control link through which the headend transmits the commands
and authorization messages that control the set-tops distributed throughout the CATV system.
The headend can also use the OOB datastream to deliver other types of information, including:
Electronic program guide (EPG) information
Application code downloads
Control messages for emergency situations
Data services
Executable code downloads to fix or upgrade cable terminal operation
Other devices in the headend create the specific commands, messages, and downloadable code
that make up the information contained in the OOB datastream. The OM 1000 accepts this
information and processes it for delivery on the OOB channel by combining it into a Motion
Picture Expert Group-2 (MPEG-2) compliant transport multiplex and outputting that transport
multiplex as an RF signal. Other output formats are also available to support specific
application requirements.
Figure 2-1 illustrates the operational flow through the OM 1000:
Figure 2-1
OM 1000 operational flow diagram
Out-of-band (OOB)
data inputs
Cable terminal
control messages
EPG information
OM 1000
Code downloads
Data services
Multiplexed
data stream
Out-of-band tranport
multiplex (OBTM)
OM 1000 Installation and Operation Manual