Avid Technology Digidesign USD User Manual page 28

6. Status
Shows the current state of USD Setup soft-
ware in relation to the USD and external
devices.
Resolver Locked Lights when the USD is
locked to the chosen external clock refer-
ence, or to its Internal clock reference.
Speed Calibration Lights when the USD
system clock and all output clocks are at a
frequency that corresponds with the cho-
sen sample rate. Capable of indicating mis-
match of pull-up, pull-down and frame
rate.
For details about Speed Calibration charac-
teristics, see "11. Status LEDs" on page 19.
Generator Running Lights when the USD is
regenerating time code at its video, LTC,
and MTC outputs in sync with the incom-
ing positional reference source. Also lit
whenever the USD is generating time code
internally.
Connected to USD Lights when USD Setup
is the front-most window and is communi-
cating with the USD.
Waiting for USD Lights when USD Setup is
the frontmost window and is unable to
communicate with the USD.
Port Relinquished Lights when USD Setup
is not the frontmost window or is unable to
allocate a serial port with which to commu-
nicate with the USD.
7. LTC Output Level
Adjusts the analog audio level of the USD
LTC output, from –24 dBu to +9 dBu.
24 Universal Slave Driver
8. Freewheel Duration
Sets the period of time for which the USD
will continue to supply positional refer-
ence data after an external source is inter-
rupted or stopped. (Also referred to as Time
Code Freewheel in Pro Tools.)
9. Video Format
Indicates the format (NTSC or PAL) for
both the incoming and outgoing video sig-
nals.
NTSC is used in North and South America,
Japan, and certain other parts of the world.
PAL is used in most of Europe, Asia, and Af-
rica. Users of SECAM video (for France, Rus-
sia, and certain other parts of the world)
should select PAL.
10. VITC Read Lines
Determines which line pair of incoming
video signal is used for the VITC source.
When set to Auto, the USD will search for
the first valid line pair automatically. Alter-
natively, this value can be set to specific
VITC line pairs.
11. VITC Generate Lines
Determines the line pair of the outgoing
video signal onto which the USD inserts
VITC. Normally, this should be left at the
default (and preferred) setting of 14/16.
12. VITC Insertion Enabled
When selected, VITC will be inserted into
the outgoing video signal—assuming that a
video signal is present at a USD video in-
put, and that the USD is in a valid mode for