DigiDesign 192 I/O Specifications download pdf (Page 10)

192 Digital I/O Guide

6

Loop Master LED

The LOOP MASTER LED indicates which

Pro Tools|HD audio interface is the master

Pro Tools peripheral. Loop Master defaults to

the first Pro Tools|HD I/O connected to the

“core” Pro Tools|HD card. On Pro Tools|HD (for

PCIe) this is the Accel Core card. On

Pro Tools|HD (for PCI) this is the HD Core card.

Loop Master will always be lit in systems with a

single interface.

In expanded systems, only one Pro Tools|HD

I/O can be Loop Master at a time. When you

change the clock source to an external clock on

a particular Pro Tools|HD I/O or a SYNC I/O,

that Pro Tools|HD I/O (or SYNC I/O) will auto-

matically become the Loop Master and all other

Pro Tools|HD I/Os in the chain will be switched

to Loop Slave mode.

Sync Mode LEDs

The SYNC MODE LEDs indicate different clock

source modes. Synchronization mode LEDs re-

flect the Clock Source choice in Pro Tools.

The SYNC MODE LEDs indicate the current

clock source.

INT (Internal)

This is the 192 Digital I/O stan-

dard clock setting. In this mode, the

192 Digital I/O sample clock is generated by its

internal crystal oscillator, as determined by the

session Sample Rate.

DIG (Digital)

Indicates that an external

AES/EBU, Optical (ADAT), or S/PDIF device is

providing system clock.

LOOP

Indicates that the 192 Digital I/O is slav-

ing to another Pro Tools|HD I/O through Loop

Sync.

EXT (External)

Indicates that 192 Digital I/O is

using the EXT CLOCK IN port for system syn-

chronization. External Clock input and output

do not have to be at the Word clock rate.

For more information, see the

Pro Tools|HD Get-

ting Started Guide

.

Meters

These four-segment LEDs indicate signal level

for each of the sixteen channels. The top row of

meters indicates input levels, and the bottom

row shows output levels. These meters are cali-

brated at –42 dB, –18 dB, –6 dB, and 0 dB, respec-

tively.

Note that 0 dB is not to be confused with

clipping; use the on-screen meters in

Pro Tools to determine whether a signal is

clipping.

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