Introduction - RAM CSS404 User Manual

CSS404 is designed for continuous monitoring of mono or stereo analog or digital audio signals.
Embedded to a broadcast installation, should the main signal disappear, it allows automatic switch to a backup signal,
analog or digital, and automatic return to the main signal when the problem is cleared.
The CSS 404-SD has the same functions as the CSS404 but also has a second backup source as an SD card.
CSS404/ CSS404-SD allows to choose main input as analog or digital, as well as backup source, separately from main
input. Output is available at the same time As well as the audio switch, CSS404 / CSS404-SD switches a RS232 main /
backup to insure continuity of data such as RDS.
Should power supply disappear, the bypass switches the digital input to the digital output, the analog input to the
analog output according to the main / backup config in use before the supply loss.
This config will be recall on supply return. The monitor section, allows input / output check using an headphones and
bargraph. A green (normal) / red (backup) indicator on the front panel shows the equipment state, an the user can
manually switch the unit to the desired output signal.
CSS404 only can draw supply from two different nets, and features two redundant power supplies, hot swappable on
the front panel.
Digital AES/EBU input /output on transformer.
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Analog balanced audio input/output.
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Digital input sample rate up to 96KHz .
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Inputs/outputs 48KHz sample rate. An internal sample rate converter (SRC) allows to synchronize all digital inputs at
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48KHz.
Digital carrier monitoring for quality and audio, adjustable from -60dBFs to 0 dBFs, and from -45dBu to +15dBu for
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analog audio. On audio loss CSS404 goes on alarm after adjustable delay
Four audio monitoring modes Left, right, Left + right, left and right.
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Full management of the unit uses the embedded web server. It keeps record of the last twenty events, of frames
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informations in real time, and the state of the switch. A front panel switch recall the factory IP address and a USB port
is used for firmware update.
Two relays report supply cuts, a third one for alarm and switch to backup.
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CSS404 / CSS404-SD is a 19" - 1U unit.
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Warning !
CSS404 / CSS404-SD mains connectors have three wires (2 poles + earth). Earth should imperatively be connected to
mains earth.
Never use this equipement without proper grounding.
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Check quality of grounding.
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Never open the case without disconnecting mains
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Avoid high temperature exposure.
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Never expose the equipment to rain, snow or moisture.
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CSS404 / CSS404-SD complies with :
EN60065, EN55013, EN55020, EN60555-2, and EN60555-3, according to 73/23/EEC, 89/336/EEC and 93/68/EEC.
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