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7. Operations

Understanding Switcher Layers

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To help you understand FSN Series architecture from a production perspective, and to assist with the creation of switcher “looks,” the diagram below illustrates how the various switcher banks are layered on the FSN-150.

•M/E 2 Off — The diagram below shows layering when M/E 2 control is disabled:

Input Video

M/E 1 M/E 1 Clean 1 (Pre Key 1)

Key 1	BG and PST buses							M/E 1 Clean 2 (Pre Key 2)
	Key 2							M/E 1 Out
							Re-entry
		PGM		PGM and		PST buses			PGM Clean 1 (Pre DSK)
			DSK						PGM Clean 2 (Post FTB)
					FTB					Program Out (Post FTB)

Figure 7-1.Switcher layers, FSN-150 — M/E 2 control disabled

•M/E 2 On — The diagram below shows layering when M/E 2 control is enabled:

M/E 1	BG and PST buses		M/E 1 Clean 1 (Pre Key 1)
	Key 1			M/E 1 Clean 2 (Pre Key 2)
		Key 2			M/E 1 Out
			Re-entry

Input Video

M/E 2 M/E 2 Clean 1 (Pre Key 1)

Key 1	BG and PST buses							M/E 2 Clean 2 (Pre Key 2)
	Key 2							M/E 2 Out
							Re-entry
		PGM		PGM and		PST buses			PGM Clean 1 (Pre DSK)
			DSK						PGM Clean 2 (Post FTB)
					FTB					Program Out (Post FTB)

Figure 7-2.Switcher layers, FSN-150 — M/E 2 control enabled

The following rules apply:

•Input video from the FSN-1400 flows into the M/E and PGM banks across the crosspoint matrix.

•Both M/E 1 and M/E 2 consist of Background (BG) and Preset (PST) buses, and two layers of keys (Key 1 and Key 2).

•Each M/E bank provides Program, Preview and Clean Feed outputs.

•M/E 1 provides a “re-entry” output that flows into M/E 2 and the PGM bank.

312 FSN Series • User’s Guide • Rev 01