PCI-822 User’s Guide
3
Connectors and Cables
The PCI-822 includes several types of connectors. Here are some
suggestions for using them.
— TDIF cables —
A TDIF cable provides 8 channels of digital audio in both directions,
with up to 24-bit resolution. It also carries clocking signals that
are used for synchronizing the transmission and reception of the
audio. TDIF cables are constructed in very specific ways to carry this
high-speed digital audio data reliably.
True TDIF cables are available from manufacturers such as Cable-Up.
Here are the part numbers and lengths available:
CU/PW88DS
½m (2')
CU/PW88D
1m (3')
CU/PW88DM
3m (10')
CU/PW88DL
5m (16')
— Word clock cables —
The 15-pin PCI-822 breakout cable has a BNC connector for word
clock output. Word clock signals contain high frequencies and should
be transmitted on 75-ohm coax cables for reliability. Usually, a BNC
connector is used for word clock. A 75-ohm video cable with BNC
connectors works well.
WARNING:
Use only cables that are specifically made for TDIF
interfaces. Similar computer-type cables will not provide reliable
operation. TDIF connectors have metric fastening screws. The non-
metric 4-40 screws found on computer-type cables are incompatible.
