Equalization
For most applications, the D8201A only requires installation in the appropriate mounting frame and
connection of input and output wiring. Factory calibrated, the D8201A can recover digital audio signals
conforming to AES/EBU specifications and transmitted over 110 Ohm, shielded, twisted pair cable up to
250 metres (750 ft) long. For cables lengths in excess of 250 metres, we recommend that the input
equalization be activated.
To activate the cable equalization, simply press the button located on the front edge of the card. The
yellow LED will illuminate to indicate that cable equalization is activated.
NOTE: In installations with consistently long runs, consideration should be given to using the D8204, a six
output distribution amplifier, designed for 75 Ohm, co-axial cable installations.
External Alarms
The controls that trigger two LED status indicators on the front edge of the amplifier card AES1 and AES2
NO LOCK (red) may be brought out via the rear connector to activate external alarms. These controls are
open collector outputs. In order to bring the alarms out, output A1 of the distribution amplifier must be
relinquished. Please refer to the Jumper Settings Diagram on the previous page to configure the alarm
jumpers. Two 3 pin berg headers are provided. Each header corresponds to one alarm output. Both
jumpers are normally installed in position AUDIO OUT enabling output A1. To bring the alarms out, move
the jumpers on both headers to position ALARM.
STATUS TALLIES AND MONITOR
Status
The D8201A is equipped with six LED status tallies, located on the front edge of the card above the
handle. The function of these tallies are:
GREEN LED1 AES1 LOCK - Indicates that the receiver is locked to the incoming
AES/EBU signal in the A Channel.
RED LED1 AES1 NO LOCK - Indicates that the receiver cannot lock to the incoming
signal in the A Channel. This may mean that there is no signal or the
signal is beyond the recoverable range of the receiver and may require
equalization.
YELLOW LED1 AES1 EQUALIZER - Indicates that the cable equalization has been
enabled for the A Channel.
GREEN LED2 AES2 LOCK - Indicates that the receiver is locked to the incoming
AES/EBU signal in the B Channel.
RED LED2 AES2 NO LOCK - Indicates that the receiver cannot lock to the incoming
signal in the B Channel. This may mean that there is no signal or the
signal is beyond the recoverable range of the receiver and may require
equalization.
YELLOW LED2 AES2 EQUALIZER - Indicates that the cable equalization has been
enabled for the B Channel.
