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IQBRK00/01
B12
IQBRK00OPS 05/04/07
www.snellwilcox.com
Version 1 Issue 6
B12.78
When Firewall Protection is not provided
Video
The firewall protects against disruption or illegal signals at the input and not against corrupt or illegal reference
provision. The user should also note that when changing genlock mode, the firewall is not maintained for the
video output during the change. Examples would include changing from free-running mode to referenced
mode or when the reference is adjusted or interrupted.
Embedded audio
Embedded audio firewall protection follows the video behavior. When the video is protected then the
embedded audio is also protected. See all the information relating to video firewall protection.
AES Audio
AES outputs will generally always maintain a firewall with the exceptions noted below. Unlike the video signal,
most reference changes do not disrupt the AES firewall.
Exceptions
AES outputs on audio products will normally maintain a firewall for PCM audio except when switching to or
from AES1 as a reference.
Only PCM signals are protected by the firewall. The non-PCM direct paths for audio do not have firewall
protection.