User guide
Chapter 3: Installing Pro Tools Hardware 17
Connecting Loop Sync
If you are using two (or more) Pro Tools audio interfaces or a SYNC peripheral, Loop Sync must be 
connected to maintain proper clock among the devices.
To make Loop Sync connections:
1 Connect the Loop Sync Out of each interface to the Loop Sync In of the next interface with the BNC 
cables included in your I/O packaging. 
2 Connect the Loop Sync Out of the last interface to the Loop Sync In of the primary interface or 
SYNC peripheral.
Figure 2. Making DigiLink Mini and Loop Sync connections
PORT 1PORT 2
12-foot DigiLink Mini 
Pro Tools|HD Native card
 cable
Loop Sync 
18-inch DigiLink
Mini cable
cables
HD OMNI
HD I/O
HD I/O
HD I/O










