Ashly ne4800 Betriebshandbuch - Seite 7

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Operating Manual - ne8800, ne4800, ne4400 DSP Processor

7 STANDARD BACK PANEL FEATURES

1. Line Inputs – Depending on the model, there are either four or eight line inputs available . Line inputs are active bal-

anced with euroblock connectors . If an unbalanced signal is used, connect the unused input pin to ground . Maximum input level

is +20dBu = FS (full scale) .

2. Line Outputs - Depending on the model, there are either four or eight line outputs available . Line outputs are servo-

balanced with euroblock connectors, and may be wire balanced or unbalanced, with a maximum output level of +20dBu FS .

3. 12V Digital Logic I/O - All models have a nine pin euroblock connector for logic inputs or outputs . The Logic I/O tab

in software allows logic pins to be assigned as either logic inputs for contact closure preset recall, mic push to talk function, or

as current-limited 12V logic outputs for control of 12V or 5V external devices .

4. 5VDC Remote Level Control - All models have a 10 pin euroblock connector for accommodating up to eight user

defined remote DC level controls. Use an Ashly WR-1 remote attenuator (or equivalent 10K potentiometer), along with a remote

gain block placed within the software DSP section to assign remote level control to any channel's input or output section . Wire

the 5VDC Remote Control ground to the CCW pin of the remote control potentiometer, wire +5 to the CW pin, and wire the

control pin (1-8) to the potentiometer wiper .

5. Ethernet Jack - This is the RJ-45 connector used for 10/100 ethernet control . Maximum cable distance to the nearest

computer, hub, or switch using CAT5 twisted pair copper cable is 100 meters .

6. RS-232 Jack - This connector is for remote control by non-Ethernet based hardware that uses RS-232 control data

protocol . A complete NE RS-232 protocol document is available on the Ashly website .

7. Remote Data - This is used to connect a remote WR-5 programmable button controller or RD-8C fader controller .

8. Word Clock - If two pieces of digital audio gear need to be synchronized, i.e. their sample rates are very slightly

different and must be made to match exactly, word clock synchronization is necessary to avoid sample skipping. Additionally,

when several pieces of gear are cascaded in an AES3 digital audio chain, each digital audio input adds some small amount of

clocking jitter and perhaps sample delay . After several units, the cumulative jitter could cause a loss of lock (and hence loss

of audio), increased distortion due to large amounts of jitter, or even a small delay . By connecting a master word clock to each

device, they all become precisely synchronized.