D8201A — AES/EBU Reclocking Distribution Amplifier

Input Impedance 110 Ohm transformer balanced Input Level 0.2-7 Vp-p Output Level 2.5 V p-p terminated Sampling Frequency Range 30 kHz to 96 kHz Jitter (average 1k-100kHz) Less than 5 ns Output Impedance 110 Ohm transformer balanced Equalization 2000 ft twisted pair 110 Ohm digital audio cable O.C. Outputs 10 Ohm 60 mA MAX 30 V MAX

Power Requirements +20 V, 100 mA, MAX -20 V, 12 mA, MAX Dimensions approx. 1" wide x 2.75" high x 10.06" deep (25.4 mm x 70 mm x 270 mm) Weight approx. 0.255 lbs. (116 grams)

D8201A Terminal Options

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Configuration

The D8201A can be configured as a single 1x8 or a dual 1x4 distribution amplifier. Refer to the Jumper Settings Diagram below. If jumper H4 is set in position 0, the D8201A is in dual mode (1x4). If jumper H4 is set in position 1, the D8201A is in single mode (1x8). The AES2 input can be a local frame input or from the rear terminal block. With jumper H3 in position 0 the D8201A will pick up the frame reference signal. If the jumper for H3 is in position 1, AES2 is from the BIN on the rear terminal block. This is useful for DARS distribution or duplication applications.

NOTE: The arrow points to the top of PCB.

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

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