Focusrite AES / SPDIF / ADAT A/D Option

Focusrite AES / SPDIF / ADAT A/D Option Product Details

Description

Two high quality A/D converters are available for OctoPre.

The converters are 24-bit and 128x over-sampled, handling sample

rates of up to 96 kHz, but can dither down to 20 or 16 bit.

All frequency settings and bit rates can be altered from the front fascia,

with an ADC lock LED to show when word clock is synchronised.

Option 1: ADAT outputs only - 8 channels of ADAT lightpipe (up to 96 kHz).

Option 2: 8 AES/EBU or S/PDIF outputs + 8 channels

of ADAT lightpipe, all on one board (all up to 96 kHz).

An external Wordclock input is also provided (BNC connector).

The AES/EBU or S/PDIF format outputs can run simultaneously with

the lightpipe outputs, giving up to 16 channels of digital output for all sample rates.

OctoPre Digital Option Operation Guide

Overview

The OctoPre digital interface card contains 8 separate analogue to digital converters

allowing all 8 OctoPre channels to be accessed simultaneously on the rear panel

as either analogue or digital signals.

The interface card is available in two feature options: -

1. AES/SPDIF/ADAT™

The 8 channels of the OctoPre are converted

simultaneously to either AES or SPDIF standard and to

ADAT™ standard.

2. ADAT™

The 8 channels of the OctoPre are converted only to

ADAT™ standard.

These instructions refer to both feature options. Note:

Where the instructions refer to features that are only

available on the "AES/SPDIF/ADAT™" version these will

be marked with an "*".

Digital Outputs

*AES

The 8 channels of OctoPre audio in AES digital format are

made accessible by connecting the AES cable to the 9 pin

D-type connector and switching "out" the AES/SPDIF

switch on the rear panel. The AES cable has four colour

coded XLR type connectors, each carries a pair of digital

audio channels as follows: -

AB

AB

AB

AB

*SPDIF

The 8 channels of OctoPre audio in SPDIF digital format

are made accessible by connecting the SPDIF cable to the 9

pin D-type connector and switching "In" the AES/SPDIF

switch on the rear panel. The SPDIF cable has four colour

coded Phono/RCA type connectors and pairs of digital

audio are sent down each cable, see above for colour to

channel identification.

ADAT™

The 8 channels of OctoPre audio in ADAT™ format are

made accessible via two light pipe sockets. The function of

these connectors is dependent upon the sample rate set

for digital conversion on the front panel. At either

44.1KHz or 48KHz sample rates both sockets transmit all

8 channels of digital audio simultaneously giving two

identical parallel outputs of all 8 channels. At either

88.2KHz or 96KHz sample rates the digital outputs are

spread across the two connectors as follows: -

Audio transmitted in digital stream OctoPre Channel

Note: The operation of splitting the 8 channels of

88.2/96KHz digital audio across two light pipe sockets

conforms to the S/MUX2 standard. This standard is

required for the ADAT™ connectors to transmit at

88.2/96KHz because of a limitation in the transmission

speed of the original ADAT™ standard. The S/MUX2

standard of operation can only be used when connecting

to equipment capable of receiving audio data conforming

to this standard, check your equipment operating

instructions for compatibility.