AES-402 technical manual - Broadcast Devices, Inc.

AES-402 technical manual - Broadcast Devices, Inc.
Broadcast Devices, Inc.
AES-402 Automatic Digital Audio Switcher/DA/Digital to
Analog Converter
Technical Reference Manual
Broadcast Devices, Inc.
Tel. (914) 737-5032
Fax. (914) 736-6916
World Wide Web:
Rev B. 03/14
Table of Contents
I. Unpacking
II. Installation and Connections
III. Features and Operation
IV. Initial Operating Setup
AES-402 Optional Programming Functions 5-6
Remote Control Connections
V. Specifications
VI. Warranty
The AES-402 Digital Audio System comprises of a two input AES compatible switcher, four
output digital audio DA and digital to analog converter. The unit also has status and diagnostic
error indicators for troubleshooting. The AES-402 is intended for use at unattended transmitter
sites or for virtually any digital switching, distribution and/or D/A conversion application. The unit
has the capability to automatically switch inputs upon detection of loss of clock, digital error flags
and/or silence sense. In addition to these features, the unit can function as an interface standards
converter. As shipped from the factory the unit is supplied with XLR balanced connectors. For
unbalanced use such as the 75 ohm unbalanced AES standard for digital audio transmission
transformer adapters are available from Broadcast Devices, Inc. for conversion of the AES-402
I/O to unbalanced 75 ohm operation.
Carefully inspect the unit after unpacking and make certain that no damage has occurred during
shipping. If damage is noted, contact the shipper immediately and file a claim for damages. Each
unit is carefully packed and carries full insurance against damage. Inspect the packing list and
make sure that the contents of the package match those described on the packing list.
Installation and Connections
Select a space in suitable E.I.A. standard rack to locate the unit. Determine the local electrical
power supply voltage. As supplied from the factory, your AES-402 is setup for 100 – 240 V.A.C.
50 - 60 Hz. No external adjustment for local power standards is necessary if power available
conforms to the above rating. The AES-402 utilizes a switch mode power supply and
automatically adjusts for local power entry. Make connections to the unit following good
engineering practice. Supply power to the unit utilizing a three pronged grounded outlet. Do no lift
the electrical ground to the unit at the power receptacle as this will result in a safety hazard. In the
event of ground loops, lift the ground at the offending connection only. Make certain that the unit
is afforded proper ventilation in the area of the top cover vent.
A. Digital Interface
The AES-402 inputs are balanced XLR connections conforming to the AES standard. Each XLR
connection is terminated at 110 ohms as per the standard. The balanced digital outputs are also
XLR connections which provide 110-ohm transformer coupled source impedance as per the AES
standard. To unbalance any input or output unbalanced termination adapters can be purchased
from Broadcast Devices, Inc. Order P/N 75 – XLRM for inputs and P/N 75-XLRF for output
connections. All BDI adapters utilize BNC female interface for application to 75 ohm BNC
connectorized cabling.
B. Analog Interface
There is provided on the rear of the unit a left/right balanced analog output. This output is suitable
for driving 600-ohm balanced lines and is short circuit protected. A headphone jack and volume
control buttons are provided on the front panel of the unit for confidence monitoring of the
incoming feed. XLR balanced outputs conform to + 4 dBm output referenced to – 20 dBFS digital
Features and Operation
The AES-402 Digital Audio System is designed to select one of two AES3 compatible feeds and
route it to up to four balanced digital outputs. It also contains a high quality digital to analog
converter providing a balanced left and right output. The unit features a front panel headphone
output and volume control for easy confidence monitoring. The AES-402 can be used as a totally
automatic switcher sensing loss of clock or any error displayed on the front panel to command the
switcher to select the alternate feed. In addition to digital error switching, the unit features a
silence sense circuit for switching upon audio failure conditions. All automatic switching functions
are user defined and can be initialized with a simple DIP switch setting upon installation of the
unit. Command of the switcher can also be performed manually at the front panel or remotely.
Remote control of the unit is accessed through the rear panel 9 pin D connector for simple
momentary closure or through the RS232/485 serial interfaces on the rear panel of the unit. For
simple momentary ground closure to the appropriate pin selects channels and error reset. Status
of channel selected and error flag is also available at this connector. Refer to the connection table
3 for connection information. The interface is compatible with open collector command. The AES402 supplies +5 V.D.C. for powering open collector actuators. The AES-402 unit includes power
fail feed through of the selected input to AES output #4. With no power connected to the unit, the
AES-402 will pass the A input signal to the #4 AES output through dry relay contacts. Upon
power application the relays energize and AES #4 output receives its signal from the last selected
input before power was removed. An optional delay is provided to prevent the unit from switching
on momentary interruptions that can occur in external equipment. Through application of a DIP
switch the unit can either switch immediately upon detection of digital errors or wait 5 seconds
and then switch. This delay prevents the unit from switching under transient conditions.
Initial Operating Set up
Attach input and output connections to the unit using the appropriate connector. Plug the remote
control plug in and tighten the connector screws in place. You may select any or all of the error
flag and/or silence sense switching which will command the switcher to switch to the alternate
path. Refer to AES-402 DIP Switch Programming Guide of Operation on page 5 for switch
options. Refer to the factory default section of the table for supplied switch conditions. If the
default conditions are satisfactory for your intended use no further changes need to be made. In
order to change the DIP SW 1, 2 settings remove the front panel by removing 1 - #4-40 Phillips
head screw in of the top cover located in the front center of the cover and 4 - #6-32 front panel
screws. The front panel can now be removed and the DIP switches located which are on the front
panel PC board. Other error flags and the silence sense error are selected by placing the
designated DIP switches to the on position. Once DIP switch positions are selected the unit is
ready to be powered up for operation. When the silence sense error is selected for switching,
there are several configurations possible. It is possible to monitor both left and right channels and
switch upon complete audio loss or to have the silence sensor switch upon loss of left or right
channel individually. This feature was added so that non correlated audio feeds can cause the
silence sensor to switch where one feed may take precedence over another. Selection of L+R,
Left, or Right only audio is done by DIP SW S1 selection.
Initial Power Application
Once power is applied and a valid AES bit stream is applied to the selected input, the unit will
default to “MAN” mode of operation. The LED indicator over the “MAN” button should be
illuminated. In addition, the channel selected LED indicator will be lit or flashing which indicates
audio level under threshold for at least 5 seconds. This feature allows the user to determine if
audio level is sufficient to drive the unit or for troubleshooting purposes. This feature can be
defeated if desired by setting DIP SW1-6 to the OFF position. In the OFF position the unit will
always indicate channel selection with a steady lighted indication. There should also be an
indication of sample frequency. The AES-402 supports any sample rate between 32 and 192
KHz. Standard sample rates are indicated on the front panel under “Sample Rate” and non
standard sample rates are indicated with the “OTHER” LED indication being illuminated. Press
the error-reset button to clear any errors that might be indicated. If the digital audio stream
feeding the active channel of the unit is valid and no errors occur the unit is ready for to be placed
in the automatic mode if desired. If any of these errors occur after depressing the error-reset
button, then the feed to the unit is defective and should be investigated. If all is in order, the unit is
now ready for operation. All that is left to do is to select the desired feed and then if desired, place
the unit in automatic switch mode by depressing the “AUTO” mode button. The LED indicator will
light indicating automatic control of the switcher. The unit will remain in this mode until an error is
detected, loss of lock occurs, silence or is detected. If any of these events occur, the unit will
switch to the alternate path and remain there until the error reset is performed from the front
panel or remotely. When in AUTO mode and an error occurs the unit will go to manual mode and
the “MAN” button and error indication will flash to indicate that an error has occurred. To clear
the error, depress the “ERROR” button. If the error clears the “ERROR” button LED will
extinguish, error indicators will extinguish and the “MAN” button will remain illuminated until the
“AUTO” button is depressed.
Description of AES-402 Optional Programming Functions
S1-1 Front Panel Button Defeat – When set to on will cause the A/B, MAN and AUTO buttons to
be non operational. Rear panel GPIO and serial remote control are still available when this switch
is turned on.
S1 -2, 3 Time Delay – Sets the time delay that the silence sensor will wait before switching. Time
delay can be set to 30, 60, 90 or 120 seconds.
S1-4, 5 Silence Detector Channel – Can be set to monitor both (L+R) or left only/right only.
When set to both, the silence detector will switch to the alternate path if one or both channels
signal level fall below threshold for the time delay set. For Left or Right only the silence sensor
will only switch after the channel being monitored times out. The unselected channel is ignored.
S1-6 Silence Indication on A/B Buttons – Will cause the selected channel button to flash if
audio level falls below threshold for more than 15 seconds. Set to off for steady on condition of
A/B buttons.
S1-8 Serial Remote Control – Turns on serial remote control functionality.
S2-1 AES ERROR Switching delay – when enabled ignores all momentary digital errors under 5
seconds in duration – eliminates inadvertent switching on transient events. When switched to off
position switcher switches channels immediately upon detection of any digital error flags enabled
by S2-2, 3, 5
S2-2 Unlock Error - When set to on will cause the switcher to switch as per S2-1 setting for an
unlock condition.
S2-3 Parity Error – When set to on will cause the switcher to switch as per S2-1 setting for a
parity error in the incoming digital audio stream.
S2-5 CRC Error – When set to on will cause the switcher to switch as per S2-1 setting for CRC
error of incoming digital audio stream.
S2-6 Audio Bit – When set to on will cause the switcher to switch as per S2-1 setting if the digital
audio stream audio bit is set to 0 which denotes non audio payload data. When this setting is set
to on the analog output is muted.
S2-7 Non PCM Audio – When set to on causes the switcher to switch as per S2-1 setting when
non PCM audio streams are detected such as Dolby E and AC-3 formats. To use the switcher
and digital DA for non PCM audio formats set S2-6, S2-7, S1-4 and S1-5 to off position. This will
allow the AES-402 unit to act as a manual digital audio switcher for non PCM audio streams and
defeats the silence sensor which cannot be used in the is mode of operation.
AES-402 DIP Switch Programming Guide of Operation Table 1.
S1-1 OFF = Front Panel Button Disables A/B and AUTO/MAN Buttons - Factory Default – ON
Silence Sensor Time out Parameters:
Silence Timeout (SEC)
30 Factory Default
Silence Detector L Channel - ON = Silence detection enabled
Silence Detector R Channel - ON = Silence detection enabled
Silence Indication on A/B Select buttons - ON = Enabled – Factory Default ON
Serial Control Enable - ON = Enabled - Factory Default ON
Digital Parameter Switch Selection:
AES Error Switching Delay – Factory Default ON
Unlock – ON - Factory Default ON
Parity – ON -Factory Default ON
Audio Bit
Non-PCM Audio
Remote Control – Parallel/GPIO DB9F Connection Table 2.
Pin 1 +5 VDC @100mA.
Pin 2 Auto Mode Select
Pin 3 Select B Input
Pin 4 Select A Input
Pin 5 Error Reset
Pin 6 Status Common
Pin 7 Status – “B” Selected
Pin 8 Status - “A” Selected
Pin 9 Auto Mode Status
Command input pins 2, 3, 4, 5 require a momentary closure to ground. Status connections open
collector outputs which require a 5 VDC pull up.
Remote Control RS-232 Connection Diagram
Digital Inputs:
Two – XLR
Digital Outputs:
Four – XLR
Analog Output:
Balanced L/R XLR + 4 dBm 600 Ohms – Rear Panel
Headphone out:
600 Ohm unbalanced - Front Panel
Sample Rate Range:
8 – 192 KHz, Auto Detect and Lock
D/A Converter Resolution:
Up to 24 bits
Remote Control:
Momentary ground closure selects channels and
reset to auto mode operation or RS-232/485 Serial
Remote Status:
Channel Select Open Collector Output
Remote Control Connectors:
DB9F throughout
Front Panel Controls:
7 - Momentary Push buttons - Switcher Selection,
Error Reset, Auto/Manual Mode Operation Select,
Volume Up/Down
Front Panel Indicators:
Sample Rate, Lock Loss, Error Flags,
Channel Status, Auto/Manual Mode
Power Requirements:
100 - 240 V.A.C. @ 0.25A; 50 – 60 Hz.
Operating Environment:
0 – 60 Degrees Celsius Non Condensing Atmosphere
19”W X 8”D X 1.75”H Mounted via Standard E.I.A.
19” rack one rack unit occupied. Weight: 8 LBS
FCC Certification Statement:
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
VI. Warranty
Broadcast Devices, Inc. products are warranted against failure due to faulty materials or workmanship
for a period of one year from the date of shipment from Broadcast Devices, Inc. dock. The warranty
covers repair or replacement of defective parts at the factory, provided the unit has been returned prepaid
by the user. All shipments to the factory shall have affixed to the outside of the container a return
authorization number obtained from the factory. The above warranty is void if the unit has been modified
by the user outside of any recommendations from the factory or if the unit has been abused or operated
outside of its electrical or environmental specifications. If customer conducted field tests suggest that the
unit may be faulty, whether or not the unit is in warranty, a full report of the difficulty should be sent to
Broadcast Devices, Inc. factory. The factory may suggest further tests or authorize return for factory
evaluation. Please email: [email protected]
Units sent to the factory should be well packed and shipped to Broadcast Devices, Inc. – Check for current shipping address. Remember to affix the R.A. number to the
outside of the carton. Any packages received without such R.A. number will be refused. Note: freight
collect shipments will also be refused. When the unit has been received, inspected and tested, the
customer will receive a report of the findings along with a quotation for recommended repairs, which are
found falling outside of the standard warranty. Units returned for in-warranty repairs, which are found not
to be defective will be subject to an evaluation and handling charge. In-warranty units will be repaired at
no charge and returned via prepaid freight.
Out-of-warranty units needing repair require a purchase order and will be invoiced for parts, labor, and
shipping charges.
When ordering replacement part, always specify A) Part Description, and Quantity; B) Date of
Purchase, Where Purchased; C) Any Special Shipping Instructions. Always specify a street address, as
shipping companies cannot deliver to a postal box.
Broadcast Devices, Inc. is not responsible for any other manufacturer’s warranty on original
equipment. Nor are we responsible for any failure, damage, or loss of property that may occur due to
the installation or operation of our equipment outside of recommended specifications.
Broadcast Devices, Inc. reserves the right to change materials, specifications, and features from
time to time.
Tel. (914) 737-5032
Facsimile: (914) 736-6916
Email: [email protected]
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