Tektronix 070-8811-08 - Manual (Page 18)

Getting Started
764 Digital Audio Monitor User Manual 3
Figure 3: The 764 rear panel and connectors
(1) Digital Audio Inputs and Loop-Throughs
The 764 has two, two-channel digital audio inputs, one labeled
CH 1–2, and the other labeled CH 3–4. Each input in the standard
instrument has two passive loop-throughs that allow you to switch the
instrument off with no effect on the through signal:
H Balanced XLR connectors for signals conforming to the AES/EBU
(AES3-1992) standard. Set the TERM switches immediately below
these connectors to EXT when the 764 is installed in-line; select
110
Ω (internal termination) when the instrument is at the end of
the signal path.