Installation guide

TDM Installation Guide34
synthesizers, samplers and effects devices. Un-
balanced connections are supported through
the use of standard 1/4-inch TRS mono phone
plugs.
1622 I/O Back Panel
The 1622 I/O has the following back panel con-
nectors, moving from left to right:
Analog Audio Inputs 1–14
These are balanced, 1/4-inch TRS jacks for ana-
log audio input connections.
Inputs can be individually calibrated from
+4 dBu to –10 dBV line levels and higher in 2 dB
gain steps, using the Other Options dialog
(choose Setups > Hardware and click Other Op-
tions). This allows the 1622 I/O to accommo-
date any standard, line-level input, including
synthesizers, samplers and effects devices. Un-
balanced connections are supported through
the use of standard 1/4-inch TRS mono phone
plugs.
The 1622 I/O analog inputs are factory cali-
brated at a –14 dB nominal level, referenced to a
full code signal. This means you can have up to
14 dB of headroom before clipping, depending
on the input levels you set in the Other Options
dialog.
Because input channels 1–2 of the 1622 I/O are
software selectable between analog or S/PDIF
digital format, input to these two analog chan-
nels is disabled when S/PDIF digital input for-
mat is chosen in the Pro Tools Hardware Setup
dialog.
Analog Audio Outputs L-R
These are balanced, 1/4-inch TRS jacks for ana-
log audio output connections. They carry
Pro Tools main output channels 1–2. The ana-
log outputs feature 24-bit digital-to-analog con-
verters. Both output channels are continuously
active. Output operating levels are switchable
between +4 dBu and –10 dBV operation.
Unbalanced connections are supported through
the use of standard 1/4-inch TRS mono phone
plugs.
The 1622 I/O analog outputs are factory cali-
brated at a –14 dB nominal level, referenced to a
full code signal. This means that at the nominal
reference output level (either +4 dBu or
–10 dBV), you have 14 dB of headroom before
clipping.
Slave Clock In/Out
The Slave Clock Out jack is a standard BNC type
connector that outputs a 256x audio sample rate
master Super Clock signal for slaving and syn-
chronizing multiple audio interfaces and syn-
chronization peripherals together.
When the 1622 I/O Sync Mode is set to Internal,
connecting a valid Slave Clock signal to the
Slave Clock In port will cause the 1622 I/O to
automatically switch to Slave mode. When the
1622 I/O is the master interface or the first inter-
face in a chain, Digital mode overrides the Slave
Clock input, and an incoming Slave Clock Out
signal will not switch the 1622 I/O to Slave
mode.
Back panel of the Digidesign 1622 I/O
Analog
Inputs
1–14
Slave
Clock
In/Out
Analog
Outputs
S/PDIF
I/O
Power
Input
60-pin
Interface
TDM_Install.book Page 34 Saturday, January 13, 2001 9:35 PM