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Also, as noted previously, always select the FIRST frequency that matches the desired output frequency, as the other
options with the same value may not result in the correct output frequency.
Example - To get the I/O Module to output 720p @ 59.94Hz:
Step 1.
Open the System Preferences > Displays pref pane on the computer.
Step 2.
Using the switch combinations outlined on page 18, change the EDID set on both outputs of the I/O
Module to the PRG-MbE 59.94Hz set.
Step 3.
On the Displays pref pane, click the Detect Displays button. Then set the resolution and frequency of both
displays to be 1280 x 720 and 59.94Hz respectively.
Step 4.
On the Mbox application's Outputs tab, confirm that the display assignment pop-up for each output shows
"PRG-MbE 59.94 (1280x720) @ 59.88 Hz".
Note: The pop-up says 59.88 Hz (not 59.94 Hz) due to the custom timing required for the I/O Module to generate SDI.
GENLOCK (GENERATOR LOCK)
Overview
The function of genlock is to synchronize the video output or capture frequency and sync point of one or more devices
to a reference signal. This functionality is important in video systems when cameras are being used or when routers or
switchers are being used. The reference sync input causes the device to start drawing or capturing each frame of video
at the correct moment (the "sync point"). With all the devices in a video system being synchronized in this manner,
tearing on outputs or between outputs, and tearing when switching between sources can be avoided.
Note: In most cases, the output/capture device must already be set to output or capture at the exact same refresh
frequency as the reference signal. This is true for the Mbox system.
Genlock and the Dual I/O Module
A genlock reference signal that is input to the Dual I/O Module can be used to tell the Mac Pro computer's graphics card
when to start drawing each frame of video. If more than one Mbox server is used, they can all be genlocked so that all
the Mbox servers in the system will start drawing frames at the same time.
The I/O Module acts as the receiver of the genlock reference signal and compares that frequency and sync point to the
current output of the Mac Pro computer's graphics card. If the computer is outputting video at the same frequency as
the reference signal, then the I/O Module sends a control signal to the computer's graphics card to bring the output's
sync point into lock with the reference signal's sync point.
S T A G E B L A C K OUT
V G A 1
S T A G E B L A C K OUT
V G A 2
Genlock
Indicator LED
P R E V IE W DIM
E DID C A P T UR E
OUT P UT 1
A
B
DV I 1
P R E V IE W 1
S DI 1
E DID C A P T UR E
P R E V IE W DIM
OUT P UT 2
A
B
DV I 2
P R E V IE W 2
S DI 2
Genlock In
Genlock Out
A C T IV E
US B
IN
OUT
T M
Dual I/O Module
G E NL OC K 1
DMX
A C T IV E
US B
IN
OUT
DMX R x
R DM R x
R DM T x
G E NL OC K 2
INP UT 1
INP UT 2
MBOX® 2016 DUAL OUTPUT HARDWARE MANUAL
P OWE R
E T HE R NE T
C OMP UT E R
L INK
T x
R x
A
B
P OR T 1
P OR T 2
23
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