Specifications

SYNC HD Guide38
Digital Clock (AES/EBU or Word
Clock) Options
To resolve the SYNC peripheral to external
AES/EBU or Word Clock using Pro Tools:
 In the SYNC Setup section of the Session
Setup window, select the appropriate digital
clock reference from the
Clock Reference pop-up
menu.
To resolve the SYNC peripheral to external
AES/EBU or Word Clock using the front panel
controls:
1 Press the Clock Reference switch to select
Word/AES (SYNC HD) or Digital (SYNC I/O).
2 Press Set, and use the Up and Down switches to
display Digital Reference (“dI6 rEF”).
3 Press Set. The LED Timecode Display displays
the current digital reference.
4 Press the Up or Down switches to select the
digital clock you want to use.
• AES/EBU (“AES-E8U”)
– or –
• Word Clock (“I CLOC”)
5 Press Set.
To resolve the SYNC peripheral to external
AES/EBU or Word Clock using the SYNC Setup
software utility (Windows only):
 Select the appropriate digital clock reference
option from the
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.
About Digital Clock
AES/EBU The SYNC peripheral AES/EBU In
connector only recognizes and uses the clock
portion 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 con-
nectors. A wide variety of professional audio de-
vices have Word Clock connectors, including
digital mixing consoles, DASH-standard digital
multitrack tape recorders and MDMs (modular
digital multitrack recorders).
Super Clock (256x)
Super Clock (or Slave Clock) is a proprietary
clock format used by legacy Pro Tools|24 MIX
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 should supply Super Clock to the
first legacy device through its External Clock
Out connector, configured for 256x Super Clock
(see “Base Clock” on page 61 for more informa-
tion).
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).
Legacy Pro Tools audio interfaces are only
supported with Pro Tools 8 or lower.
For additional digital clock signal informa-
tion, see “Digital Clock Signal Types” on
page 73.