DigiDesign 96i I/O Specifications download pdf (Page 12)

96i I/O Guide

8

S/PDIF Digital In and Out

These are unbalanced RCA jacks that accept and

output a stereo S/PDIF digital data stream.

S/PDIF supports up to 24-bit audio up to the

96 kHz sample rate. S/PDIF input can be chosen

as the input source for channels 1–2 in the Hard-

ware Setup dialog. S/PDIF output is mirrored to

analog outputs 1–2.

To maintain data integrity and minimize jitter,

use only 75-ohm coaxial cable.

Loop Sync In and Out

Loop Sync is a dedicated Pro Tools clock loop for

synchronizing multiple Pro Tools|HD peripher-

als together. The Loop Sync In and Out ports are

standard BNC connectors that output a 1x Loop

Sync clock signal. Loop Sync should only be

used to connect multiple Pro Tools|HD periph-

erals (other audio interfaces and the SYNC I/O).

Loop Sync uses a word clock signal based on

sample rates of either 44.1 kHz or 48 kHz. As

sample rate increases in the system, Loop Sync

continues to operate at a base rate of 44.1 kHz or

48 kHz (44.1 kHz for 88.2 kHz sessions, 48 kHz

for 96 kHz sessions).

For more information on Loop Sync and its con-

nection requirements, see the

Pro Tools|HD Get-

ting Started Guide

.

EXT. CLOCK In and Out

The External Clock I/O ports are standard BNC

connectors that receive and output a word clock

signal. These ports can be used to synchronize

the 96i I/O to any device that requires (or pro-

vides) word clock.

External Clock In and Out are configured in the

Hardware Setup dialog.

Primary Port

The Primary Port is used to connect the 96i I/O

to your Pro Tools|HD cards, or to another

Pro Tools|HD audio interface, using a DigiLink

cable.

•When the 96i I/O is the only audio interface

in the system, the Primary Port is connected

directly to the Accel Core card (Pro Tools|HD

for PCIe systems) or HD Core card

(Pro Tools|HD for PCI systems).

•When the 96i I/O is used as an additional I/O

in an expanded Pro Tools|HD system, the

96i I/O Primary Port can be connected to an

HD Accel or HD Process card, or to the Ex-

pansion port on a 192 I/O, 192 Digital I/O, or

96 I/O. For information about connecting ex-

panded Pro Tools|HD systems, see the

Ex-

panded Systems Guide

.

Expansion Port

The Expansion Port is used to connect an addi-

tional Pro Tools|HD I/O to the 96i I/O. Using a

DigiLink cable (one is included with each

Pro Tools|HD audio interface), another 96i I/O

can be connected to the Expansion Port for an

additional 16 channels of input.

Because the Loop Sync and Word Clock ports

pass crucial timing information, use high-

quality 75-ohm coaxial cables. RG59 or bet-

ter quality cable is recommended.

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