Harris Legacy 99-1300-0, Руководство по эксплуатации и техническому обслуживанию

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Revision B • 1/03
H A R R I S C O R P O R A T I O N
2-10
2 Installation
Digital Connections
Most of Legacy’s digital inputs and outputs are
wired like the Microphone Input shown above. One
exception is the RLS module, which uses 6-pin
connectors since it can be set for analog or digital
operation. When set for digital, the signals con-
nect using pins 1, 2, and 3 of the connector.
The other modules with digital inputs or out-
puts; Universal Input, Telco/Codec, Output 1 and
2, use three-pin connectors like that shown above.
The digital inputs accept AES-3 (AES/EBU) com-
patible signals and, as mentioned in the Unbal-
anced Connections section that follows, can also
accept S/PDIF signals in most cases.
Each digital output is an AES-3 compatible sig-
nal (nominal sample rate is 48 kHz, but some
outputs are switch selectable for 44.1 kHz) . AES-
3 output signals cannot connect directly to an
S/PDIF input. A signal translation interface is re-
quired to accomplish this function.
UNBALANCED CONNECTIONS
Although all analog inputs and outputs are
active and balanced, unbalanced consumer or
“semipro” equipment can be connected to the con-
sole. For best results, connect an unbalanced de-
vice through an IHF-PRO match box and keep
the unbalanced cable lengths as short as possible.
If a match box is not available, connect an un-
balanced device to a Legacy input using the fol-
lowing illustration.
When an unbalanced device must connect to a
Legacy balanced analog output, and an IHF-PRO
match box is not available, do not tie the low (-)
and shield pins together to “unbalance” the sig-
nal. The low output pin must always be left “float-
ing” when unbalancing a Legacy output, as shown
in the following illustration.
S/PDIF Signals
Digital devices with only an S/PDIF digital out-
put can connect to a Legacy input, but only when
a 249 ohm resistor is added to load the 75 ohm
S/PDIF cable. Install the resistor at the AMP MOD
IV housing per the illustration on the next page.
Connecting an Unbalanced Device
to a Legacy Analog Input
Console
Balanced
Input
From the
Unbalanced
Device
R
L
Shields
3
2
1 6
5
4
Console
Balanced
Output
3
2
1 6
5
4
To the
Unbalanced
Device
R
L
Shields
Connecting an Unbalanced Device
to a Legacy Analog Output
(Nominal Output is -2 dBu)
(Make no connections to pins 2 & 5)
Microphone Input — 3-Pin Connector
Pin Signal Description
1 Shield (connects directly to the chassis)
2 Low (- input)
3 High (+ input)
AES/EBU Digital Inputs and
External Clock Reference Input
Pin Signal Description
1 Shield (connects directly to the chassis)
2 Low (- input)
3 High (+ input)
AES/EBU Digital Outputs
Pin Signal Description
1 Shield for AES/EBU signal
2 Low (- output)
3 High (+ output)