Extron electronic MAV Plus Installation, cont’d, Sync termination switches systems with sync BMEs

Installation, cont’d

Sync termination switches (systems with sync BMEs)

c Sync termination switches — The CrossPoint 450 Plus Sync matrix switcher BMEs have sync termination switches on the rear panel for inputs 1 through 16. The switches provide a way to condition non-TTL sync levels greater than 5 Vp-p, enabling the sync to be properly passed from input to selected output(s).

Each switch provides the option of selecting either 510 ohms or 75 ohms. The 75 ohms position is required only for an input with non-TTL sync, greater than 5 V p-p. The normal position is 510 ohms.

1 2 3 4 5 6 7 8

75

510

10 12 14 16

9 11 13 15

75

510

NAn input that produces an out of sync display, a display that is rolling vertically and/or tearing horizontally, could indicate a non-TTL sync input.

A device that is known to output non-TTL sync levels (greater than 5V p-p) should be connected to one of the inputs with sync termination switches, and the switches for that input should be set to the 75 ohm position. If you are not sure, check the specifications in the user’s manual for the input device.

Audio input and output (systems wtih audio BMEs)

NFigure 2-2 shows a MAV Plus 6464 Stereo audio BME. The mono audio BME looks similar, but with 3-pole captive screw connectors rather than the 5-pole connectors shown.

By default, the audio ties follow the video ties. Audio breakaway, which can be activated via the optional front panel or under Ethernet or RS-232/RS-422 control, allows you to select from any one of the audio input sources and route it separately from its corresponding video source. See chapter 3, Operation, chapter 4, SIS Programming and Control, chapter 5, Matrix Software, and chapter 6, HTML Operation for details.

d Connections for balanced and unbalanced audio inputs — Each input has a

3.5mm, 5-pole (stereo audio BME) or 3-pole (mono audio BME) captive screw connector for balanced or unbalanced stereo or mono (depending on the BME) audio input. Connectors are included with each switcher, but you must supply the audio cable.

See figure 2-3 to wire a connector on a stereo audio BME for the appropriate input type and impedance level.

	Tip	L
	Sleeve
	Tip	R
	Sleeve
0.2” (5 mm) max.	Unbalanced Stereo Input
Do not tin the wires!		(high impedance)

Tip	L
Ring
Sleeve (s)
Tip	R
Ring

Balanced Stereo Input

(high impedance)

Figure 2-3 — Captive screw connector wiring for stereo audio inputs

COn stereo audio BMEs, the captive screw audio connector can easily be inadvertently plugged partially into one receptacle and partially into an adjacent receptacle. This misconnection could damage the audio circuits. Ensure that the connector is plugged fully and only into the desired input or output.

2-4 CrossPoint 450 Plus and MAV Plus Switchers • Installation