AJA FS2 - Manual (Page 77)

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77 FS2 Installation and Operation Manual — SYSTEM Menu Group
4 SDI1 3G Detect This parameter configures 3G operation of the SDI 1 video input. The input can be set
for 1080p50/60 (single video), Dual Stream 3G SDI (two muxed videos), or Auto-Detect
whether the input is 1080p50/60 single or Dual Stream 3G video (requires SMPTE
Format ID to be present in the SDI Input).
In Auto Detect mode, the hardware looks for SMPTE 352 Payload ID ANC data on the
video inputs to determine whether there are two independent 1080i signals (Dual
Stream) or a single 1080p50/60 signal. If there is no SMPTE 352 data, the default is to
assume 1080p50/60 (single), but you can manually instruct the FS2 to always assume
either 1080p50/60 or Dual Stream by selecting one of those choices.
In 1080p50/60 mode, the system always assumes that the input is a single 1080p50/60
signal (even if there is SMPTE 352 data to the contrary).
In Dual Stream mode, the system always assumes (even if there is SMPTE 352 data to
the contrary) that the input consists of two multiplexed independent 3G video
streams . The signals are demuxed as shown.
Dual Stream 3G Mode Schematic
5 SDI2 Input
Protect This parameter allows you to protect Input SDI 2 from being taken by a Dual Stream
selection made in menu 4.
In the Normal setting (default), the SDI 2 video signal always comes from the SDI 2
physical input. Choosing Auto Detect or Dual Stream in parameter 4 does not switch
away from the physical input.
In the Dual Stream setting, the FS2 assumes both channels of Dual Stream 3G video
are muxed onto a single wire at the SDI1 input. The SDI 2 video signal is then taken
internally from the SDI 1 Stream 2 signal instead of the SDI2 In connector.
4 SDI1 3G Detect Selections Selection Descriptions
Auto Detect (default)
1080p50/60
Dual Stream
Automatically detects presence of 1080p50/60 or Dual
Stream video.
Configures the SDI1 input for 1080p50/60 (single) video.
Configures SDI 1 for Dual Stream 3G video (uses SDI 1 and
SDI 2 in Input Crosspoint matrix).
5 SDI2 Input Protect Selections Selection Descriptions
Normal (default)
Dual Stream
SDI2 cannot be used by Dual Stream 3G SDI video on SDI Input 1.
Allows SDI2 to be used by a Dual Stream 3G SDI input present on SDI 1.