Cisco Cisco 6920 RateMUX Advanced MPEG-2 Multiplexer Technical Manual
RateMux - No Video Output
and the Significance of NIT PID
PassThru and CASysID
and the Significance of NIT PID
PassThru and CASysID
Document ID: 12549
Contents
Introduction
Before You Begin
Conventions
Prerequisites
Components Used
Why the NIT PID Needs to be Passed Through
Why the CA SysID Needs to be Set to 47 49
Configuring the RateMux to Passthru the NIT PID
Configuring the RateMux to Set the CA SysID to 47 49
Troubleshooting FAQs
Related Information
Introduction
In an MPEG II digital video network that utilizes Motorola
Integrated Receiver Transcoder (IRT) equipment and Motorola DigiCipher II based encryption system,
it is important that all the relevant components of the network have access to the system clock. Access to
the system clock is conveyed by the Network Information Table (NIT) Packet ID (PID).
Integrated Receiver Transcoder (IRT) equipment and Motorola DigiCipher II based encryption system,
it is important that all the relevant components of the network have access to the system clock. Access to
the system clock is conveyed by the Network Information Table (NIT) Packet ID (PID).
Additionally, each video program needs to have a special parameter set in its Program
Map/Management Table (PMT). This parameter, called the CA SysID, needs to be set to 47 49 (the
ASCII codes for the letters G and I in hexadecimal) in order for Motorola IRTs to recognize that the
video stream should be processed as part of an encryption function.
Map/Management Table (PMT). This parameter, called the CA SysID, needs to be set to 47 49 (the
ASCII codes for the letters G and I in hexadecimal) in order for Motorola IRTs to recognize that the
video stream should be processed as part of an encryption function.
If the appropriate equipment does not have proper access to the system clock conveyed by the NIT PID,
and if individual programs do not have the CA SysID correctly set, then program encryption or
decryption may not occur properly, and loss of video results.
and if individual programs do not have the CA SysID correctly set, then program encryption or
decryption may not occur properly, and loss of video results.
By default, the Cisco RateMux 6920 Advanced MPEG-2 Multiplexer does not pass the NIT PID
through from input ports to output ports. This document explains how to configure the RateMux 6920
multiplexer to achieve this. The document also discusses some of the most common pitfalls that can
through from input ports to output ports. This document explains how to configure the RateMux 6920
multiplexer to achieve this. The document also discusses some of the most common pitfalls that can
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Cisco - RateMux - No Video Output and the Significance of NIT PID PassThru and CAS...
11/17/2005
http://www.cisco.com/warp/customer/109/ratemux_no_video.shtml