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Highlights
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Transformer-coupled inputs and outputs
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Flexible configuration options
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Status indicator lights
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XLR-type connectors
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Single rack space mounting
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Rugged construction
Two AES/EBU Inputs
Each
input provides transformer coupling and DC voltage blocking. Status
indicators light whenever digital information is present on their
respective input.
Eight AES/EBU Outputs
The Model 85 contains eight independent AES/EBU output sections. The
rugged output circuits feature transformer coupling. For
flexibility, each of the eight outputs can individually select input
A or B as its source. This allows the Model 85 to act as a single
1x8 distribution amplifier (DA), or two fully independent DAs.
Example configurations include creating a dual 1x4 DA, or a
combination 1x3 DA and 1x5 DA.
Technical Background
The
original AES/EBU specification (AES3-1985) called for a single transmitter
to drive up to three receivers. In practice this proved to make data
transmission susceptible to errors as an impedance mismatch can be
created. The revised edition of the specification (AES3-1992) advises that
a single transmitter should drive only a single receiver. The Model 85
addresses this requirement in a simple, reliable manner. Up to eight
identical, but fully isolated, "copies" of the original signal
are created.
No Data Manipulation
The
Model 85 performs minimal processing to the AES/EBU digital audio data.
The signal is received, converted to a standard logic signal, then
retransmitted using rugged driver circuits. No timing "correction" is
performed. No data is manipulated, added, or changed. The Model 85
assumes that your digital signals have been carefully created and simply
need to be distributed to multiple inputs. In an age when everyone wants
to "fix" your digital signals the Model 85 takes a "hands off" approach.
With a nominal 60 nanosecond input to output delay, the outputs are
essentially identical to the inputs.
Model
85 Specifications
Inputs: 2
Format: AES/EBU
Type: capacitor isolated, transformer coupled
Receiver Equalization: none
Impedance: 110 ohms
Amplitude Range: 0.3 to 7 Vp-p
Supported Sample Rates: 32 kHz to 192 kHz
Outputs: 8
Format: AES/EBU
Type: transformer coupled
Impedance: 110 ohms
Level: 4.5 Vp-p, terminated, nominal
Input-Output Time Delay: 60 nSec, nominal
AES/EBU
Performance Compatibility: designed for compliance with AES3-1992
(ANSI S4.40-1992), AES Recommended practice for digital audio engineering–Serial
transmission format for two-channel linearly represented digital audio
data
Connectors:
AES/EBU: 3-pin XLR-type, female (2), male (8)
AC Mains: standard 3-blade IEC-type
AC
Mains Requirement: 100, 120, or 220/240 V, ±10%, factory
configured, 50/60 Hz
Dimensions
(Overall):
19.00 inches wide (48.3 cm)
1.72 inches high (4.4 cm)
6.65 inches deep (16.9 cm)
Mounting: one space in a standard 19-inch rack
Weight:
7.0 pounds (3.2 kg)
Specifications
subject to change without notice.
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