DigiDesign SYNC HD Manual page 44

Digital Clock (AES/EBU or Word
Clock) Options
To resolve the SYNC peripheral to external
AES/EBU or Word Clock:
From Pro Tools:
In the SYNC Setup section of the Session Setup
window, select the appropriate digital clock ref-
erence from the Clock Reference pop-up menu.
From the front panel:
Press the Clock Reference switch to select
1
Word/AES (SYNC HD) or Digital (SYNC I/O).
Press Set, and use the Up and Down switches
2
to display Digital Reference ("dI6 rEF").
Press Set. The LED Time Code Display displays
3
the current digital reference.
Press the Up or Down switches to select the
4
digital clock you want to use.
• AES/EBU ("AES-E8U")
– or –
• Word Clock ("I CLOC")
Press Set.
5
From the SYNC Setup software utility
(Windows only):
Select the appropriate digital clock reference
option from the SYNC Setup Clock Ref pop-up
menu.
If the chosen clock reference source is unavail-
able, or the current configuration is not valid,
the Locked LED on the right side of the SYNC
peripheral front panel flashes.
38 SYNC HD Guide
About Digital Clock
AES/EBU The SYNC peripheral AES/EBU In con-
nector only recognizes and uses the clock por-
tion of an incoming AES/EBU audio signal. All
audio information will be ignored and will not
be passed to the SYNC peripheral AES/EBU Out
connector.
Word Clock Word Clock is a digital clock refer-
ence signal that runs at 1x sample rate (44.1, 48,
88.2, 96, 176.4, or 192 kHz). Pro Tools|HD inter-
faces have dedicated BNC-style Word Clock
connectors. A wide variety of professional audio
devices have Word Clock connectors, including
digital mixing consoles, DASH-standard digital
multitrack tape recorders and MDMs (modular
digital multitrack recorders).
Slave Clock (256x)
Slave Clock (or Super Clock) is a Digidesign pro-
prietary clock format used by legacy Digidesign
audio interfaces (such as 888|24, 882|20, 1622,
and ADAT Bridge) that runs at 256 times the
sample rate.
When using legacy interfaces with a SYNC pe-
ripheral and Pro Tools|HD, your master HD au-
dio interface (192 I/O, 192 Digital I/O, 96 I/O, or
96i I/O) should supply Slave Clock to the first
legacy device through its External Clock Out
connector, configured for 256x Slave Clock (see
"Base Clock" on page 61 for more information).
Pro Tools|HD audio interfaces are always con-
nected using Loop Sync (see "Clock for
Pro Tools Audio Interfaces" on page 8 for more
information).
For additional digital clock signal informa-
tion, see "Digital Clock Signal Types" on
page 73.