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Knowledge Base > Accessories > I/O Expansion Cards > 4 Channel Digital Output Card

SPDIF and AES are two channel formats, so does each of the two outputs on the 4 Channel Digital Output Card have more than one channel?

Yes, each channel on the card sends two channels of audio.  They are labeled 1 / 2 and 3 / 4.

Why does the 4 Channel Digital Output Card have a word clock input when this is an output card?

It seems confusing at first glance, but the word clock output is there so that the 4 Channel Digital Output Card can output AES or spdif to a downstream device at any sample rate between 12 kHz and 96 kHz. When no word clock is connected the 4 Channel Digital Output Card will output at 48 kHz.

The 4 Channel Digital Output Card supports AES and SPDIF, how does it handle the different impedance of the two formats?

There is an impedance matching transformer on the 4 Channel Digital Output Card to switch between 110 Ohm and 75 Ohm.

Why are there word clock inputs on the 4 Channel Digital Output card?

SymNet digital outputs will be used to send digital audio to a 3rd party digital device which may be running on a different sample rate than Edge or Radius AEC’s internal rate of 48 kHz. With a word clock input respectively, each digital out pair can send audio at any sample rate between 32 kHz and 192 kHz.

What if I order an Edge or Radius AEC Frame but do not fill up the card slots?

Filler panels will reside in the empty slots.

Where can I find an Ethernet application with IP capable Symetrix products?

SymNet Remote Terminal is a UDP terminal test application for testing Ethernet-based control for Symetrix products.

SymNet Remote Terminal.zip