Installation guide

TDM Installation Guide22
888/24 I/O Back Panel
The 888/24 I/O has the following back panel
connectors, moving from left to right:
Analog Audio Outputs
These are balanced male XLR connectors for an-
alog audio output connections. All eight output
channels are continuously active. The
888/24 I/O analog outputs feature 24-bit digital-
to-analog converters.
Analog Audio Inputs
These are balanced female XLR connectors for
analog audio input connections. The
888/24 I/O analog inputs feature 24-bit analog-
to-digital converters. Because input channels
1–8 of the 888/24 I/O are software selectable in
pairs between analog or digital format, analog
input to a channel pair is disabled when digital
input format is chosen for that channel.
The 888/24 I/O analog audio connectors are bal-
anced XLRs with pin 2 wired hot, (or “+”); pin 3
cold, (or “–”); and pin 1 ground.
AES/EBU Digital Outputs 1–8
The 888/24 I/O AES/EBU output jacks are bal-
anced, 3-conductor, XLR connectors which out-
put a 24-bit digital data stream. Output is con-
tinuously active on both the AES/EBU and
S/PDIF jacks even when the 888/24 I/O input se-
lector is set to analog.
AES/EBU Digital Inputs 1–8
The AES/EBU digital format is used in many pro-
fessional digital audio devices, including some
DAT recorders. The interface’s AES/EBU input
jacks are balanced, 3-conductor XLR connectors
which accept a full 24-bit digital data stream.
For AES/EBU connections, 110-ohm cables are
highly recommended for use in professional in-
stallations. For best results, cable lengths should
not exceed 30 meters.
Input channels 1–8 of the 888/24 I/O are soft-
ware selectable in pairs between analog or digi-
tal format. Digital input to a channel pair is dis-
abled when analog input format is chosen for
that channel in the Hardware Setup dialog. In-
put to AES/EBU input channels 1–2 is disabled
when S/PDIF digital format is chosen for these
inputs in the Pro Tools Session Setup window.
50-pin Interface Connector
This 50-pin Computer connector is used to con-
nect the 888/24 I/O to a MIX card, d24 audio
card, Disk I/O card, or a DSP Farm card. The nec-
essary cable is supplied with your audio inter-
face. If you plan to connect two 888/24 I/O in-
terfaces to a MIX card or d24 card, a 16-channel
peripheral cable adapter is necessary. (This cable
is available from your Digidesign dealer.)
Back panel of the 888/24 I/O
Analog Outputs
Analog Inputs
AES/EBU
Outputs
AES/EBU
Inputs
Slave
Clock
I/O
S/PDIF
I/O
50-pin
Interface
Power
Input
TDM_Install.book Page 22 Saturday, January 13, 2001 9:35 PM