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<h1 class="firstHeading">Digital Cards</h1>
<div id="bodyContent">
<p id="siteSub">The Soundweb London Digital Input Cards
and Digital Output Cards are designed to populate any
of the four card slots on Soundweb London devices. These
digital cards enable Soundweb London devices to send and
receive AES/EBU and S/PDIF audio signals.</p>
<p><img src="Cdplayersetup.JPG" alt="Image:Cdplayersetup.JPG" title="Image:Cdplayersetup.JPG" width="601" height="397" border="2" class="hcp1"></p>
<h2>Basic Functionality</h2>
<p><font face="Arial" class="hcp2"><font size="1" class="hcp3"><img src="MAIN0159.gif" alt="MAIN0159.gif" title="MAIN0159.gif" width="264" height="127" border="0" class="hcp4"></font></font></p>
<p class="hcp5">The Digital Input Cards and
Digital Output Cards each have two connectors which are
used as follows: -</p>
<h3><span class="hcp6">Digital Input Cards
(</span><span class="hcp7">Card position
&quot;A&quot; in rear panel diagram)</span></h3>
<ul>
<li class="p"><p class="hcp5">Connector
1 <span class="hcp8">(</span><span class="hcp7">Connector on right hand
side in rear panel diagram)</span></p></li>
<li class="hcp9"><ul>
<li class="p"><p class="hcp5">Stereo
Audio, Channels 1&amp;2 - AES/EBU</p></li>
<li class="p"><p class="hcp5">Stereo
Audio, Channels 3&amp;4 - AES/EBU</p></li>
</ul></li>
<li class="p"><p class="hcp5">Connector
2 <span class="hcp8">(</span><span class="hcp7">Connector on left hand
side in rear panel diagram)</span></p></li>
<li class="hcp9"><ul>
<li class="p"><p class="hcp5">Stereo
Audio, Channels 1&amp;2 - S/PDIF</p></li>
<li class="p"><p class="hcp5">Stereo
Audio, Channels 3&amp;4 - S/PDIF</p></li>
</ul></li>
</ul>
<span><font style="font-size: 10pt; font-weight: bold;"
size="2">Digital Input Card Connections</font></span>
<table wrapperparagraphselector="P" cellspacing="2" width="100%" border="1" class="hcp10">
<tr>
<td style="width:18%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">Connector</span></font></p></td>
<td colspan="2" style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">[S/PDIF
Combicon]</font></p></td>
<td colspan="2" style="width:14%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">[AES/EBU
Combicon]</font></p></td>
</tr>
<tr>
<td style="width:18%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">Signal pair</span></font></p></td>
<td style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">3&amp;4</font></p></td>
<td style="width:14%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">1&amp;2</font></p></td>
<td style="width:14%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">3&amp;4</font></p></td>
<td style="width:24%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">1&amp;2</font></p></td>
</tr>
<tr>
<td style="width:18%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">Pin</span></font></p></td>
<td style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">&#160;[S
+ -]</font></p></td>
<td style="width:14%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">&#160;[S
+ -]</font></p></td>
<td style="width:14%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">[S
+ -]</font></p></td>
<td style="width:24%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">&#160;[S
+ -]</font></p></td>
</tr>
</table>
<table wrapperparagraphselector="P" cellspacing="2" width="100%" border="1" class="hcp10">
<tr>
<td style="width:15%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">AES/EBU</span></font></p></td>
<td style="width:31%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13">Positive:
to +</font><font face="Courier New" class="hcp13"><br>
Negative: to -</font><font face="Courier New" class="hcp13"><br>
Shield : to S</font></p></td>
<td style="width:14%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">S/PDIF</span></font></p></td>
<td style="width:37%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13">Signal
: to + Signal Ground: to - Shield* : to S</font></p></td>
</tr>
</table>
<p class="hcp5">&#160;<font face="Courier New" class="hcp13">*
Short &quot;S&quot; to &quot;-&quot; for unshielded cable</font></p>
<h3><span class="hcp6">Digital Output Cards
(</span><span class="hcp7">Card position&quot;C&quot;
in rear panel diagram)</span></h3>
<ul>
<li class="p"><p class="hcp5">Connector
1 <span class="hcp8">(</span><span class="hcp7">Connector on right hand
side in rear panel diagram)</span></p></li>
<li class="hcp9"><ul>
<li class="p"><p class="hcp5">Stereo
Audio, Channels 1&amp;2 - AES/EBU / S/PDIF</p></li>
<li class="p"><p class="hcp5">Stereo
Audio, Channels 3&amp;4 - AES/EBU / S/PDIF</p></li>
</ul></li>
<li class="p"><p class="hcp5">Connector
2 <span class="hcp8">(</span><span class="hcp7">Connector on left hand
side in rear panel diagram)</span></p></li>
<li class="hcp9"><ul>
<li class="p"><p class="hcp5">Clock
Input - High Impedance</p></li>
<li class="p"><p class="hcp5">Clock
Input - 75R Terminated</p></li>
</ul></li>
<li class="p"><p class="hcp5">active clock
selected within HiQnet London Architect</p></li>
</ul>
<p style="font-weight: bold; font-size: 10pt; font-style: normal;">Digital
Output Card Connections</p>
<table wrapperparagraphselector="P" cellspacing="2" width="100%" border="1" class="hcp10">
<tr>
<td style="width:18%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">Connector</span></font></p></td>
<td colspan="2" style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">[Clock
Input]</font></p></td>
<td colspan="2" style="width:22%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">[Audio
Output]</font></p></td>
</tr>
<tr>
<td style="width:18%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">Signal pair</span></font></p></td>
<td style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">3&amp;4</font></p></td>
<td style="width:16%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">1&amp;2</font></p></td>
<td style="width:22%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">3&amp;4</font></p></td>
<td style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">1&amp;2</font></p></td>
</tr>
<tr>
<td style="width:18%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">Pin</span></font></p></td>
<td style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">&#160;[S
+ -]</font></p></td>
<td style="width:16%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">&#160;[S
+ -]</font></p></td>
<td style="width:22%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">[S
+ -]</font></p></td>
<td style="width:21%;" class="hcp11"><p class="hcp14"><font face="Courier New" class="hcp13">&#160;[S
+ -]</font></p></td>
</tr>
</table>
<table wrapperparagraphselector="P" cellspacing="2" width="100%" border="1" class="hcp10">
<tr>
<td style="width:15%;" class="hcp11"><p class="hcp12"><span class="hcp6"><font face="Courier New" class="hcp13">Clock
Input</font></span></p></td>
<td style="width:31%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13">Positive:
to +</font><font face="Courier New" class="hcp13"><br>
Negative: to -</font><font face="Courier New" class="hcp13"><br>
Shield : to S</font></p></td>
<td style="width:14%;" class="hcp11"><p class="hcp12"><span class="hcp6"><font face="Courier New" class="hcp13">AES/EBU</font></span></p></td>
<td style="width:37%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13">Positive
: to + Negative : to - Shield : to S</font></p></td>
</tr>
<tr>
<td colspan="2" style="width:15%;" class="hcp11"><p class="hcp12">&#160;</p></td>
<td style="width:14%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13"><span class="hcp6">S/PDIF</span></font></p></td>
<td style="width:37%;" class="hcp11"><p class="hcp12"><font face="Courier New" class="hcp13">Signal
: to + Signal Ground: to - Shield* : to S</font></p></td>
</tr>
</table>
<p style="font-family: 'Courier New'; font-size: 10pt;">*
Short &quot;S&quot; to &quot;-&quot; for unshielded cable</p>
<h3>Digital Card Configuration</h3>
<p class="hcp5">The digital cards can be configured,
within HiQnet London Architect, in the following ways:
-</p>
<ul>
<li class="p"><p class="hcp5">2 Stereo
AES/EBU signals</p></li>
<li class="p"><p class="hcp5">1 Stereo
AES/EBU signal / 1 Stereo S/PDIF signal</p></li>
<li class="p"><p class="hcp12"><font size="2" class="hcp15">2 Stereo S/PDIF signals</font></p></li>
</ul>
<h2>Digital Cards - SyncBus</h2>
<p class="hcp5"><span class="hcp6">SyncBus</span>
is used to sync the Digital Output Card to another digital
card.</p>
<p><font face="Arial" class="hcp2"><font
style="font-size: small;" size="3"><img src="MAIN0160.gif" alt="MAIN0160.gif" title="MAIN0160.gif" width="251" height="82" border="0" class="hcp4"></font></font></p>
<p class="hcp5">All digital cards are connected
through a parallel bus.</p>
<p class="hcp5">Each digital card has 2 SyncBus
connectors so that all cards can be daisy chained together.</p>
<p class="hcp12"><font size="2" class="hcp15">SyncBus is
used automatically when a digital output card is synced
to another digital card and the clock is sent from one
card to the other.</font></p>
<h2><span style="font-size: 14pt;">Digital Cards - Front
Panel Information on Soundweb London Devices</span></h2>
<p><font face="Arial" class="hcp2"><font size="1" class="hcp3"><img src="MAIN0161.gif" alt="MAIN0161.gif" title="MAIN0161.gif" width="278" height="179" border="0" class="hcp4"></font></font></p>
<h3>In, Out, Dig LEDs</h3>
These indicate which card is contained within the card
slot
<ul>
<li class="p"><p class="hcp5"><span class="hcp6">Digital
Input Card</span> - 'IN' and 'DIG' illuminated</p></li>
<li class="p"><p class="hcp5"><span class="hcp6">Digital
Output Card</span> - 'OUT' and 'DIG' illuminated</p></li>
<li class="p"><p class="hcp5"><span class="hcp6">Sync/48V
LED</span> - illuminates to indicate that signals
are synced</p></li>
<li class="p"><p class="hcp5"><span class="hcp6">Signal
LED</span> - indicates signal present (illuminates
at -40dBFS)</p></li>
<li class="p"><p class="hcp5"><span class="hcp6">Clip
LED</span> - indicates high signal at input stage</p></li>
</ul>
<p class="hcp12"><span class="hcp7"><font size="2" class="hcp15">Note: The Clip LED may
illuminate frequently when using digital inputs. This
is no cause for concern as digital playback media is often
normalized to Full Scale, resulting in a highly optimised
but implicitly safe signal.</font></span></p>
<h2>Digital Input Card Configuration</h2>
<div id="div1">
<p><img src="DigitalInputCardCP.jpg" alt="image:DigitalInputCardCP.jpg" title="image:DigitalInputCardCP.jpg" width="545" height="635" border="2" class="hcp1"></p>
<p>The Digital Input Card Default Control Panel allows
users to configure, control and monitor a Digital
Input Card.</p>
<h3>Input Type</h3>
<p><img src="Inputtype.JPG" alt="image:inputtype.JPG" title="image:inputtype.JPG" width="148" height="60" border="2" class="hcp1"></p>
<p><span class="hcp6">Input Type</span>
allows an AES/EBU or S/PDIF digital input to be selected
per stereo signal.</p>
<h3>Bypass Sample Rate Conversion</h3>
<p><img src="Bypasssamplerateconversion.JPG" alt="image:Bypasssamplerateconversion.JPG" title="image:Bypasssamplerateconversion.JPG" width="134" height="33" border="2" class="hcp1"></p>
<p>The <span class="hcp6">Bypass Sample
Rate Conversion</span> button allows users to bypass
the sample rate conversion per stereo signal in order
to improve audio quality for matched sample rates.</p>
<p><span class="hcp7">Note: For trouble-free
operation of Bypass Sample Rate Conversion, the external
clock must be the same sample rate as the device;
either 48 kHz or 96 kHz and ultimately locked to the
same clock source. If the clocks are not locked drift
may occur, resulting in audible clicks.</span></p>
<h3>Sample Rate</h3>
<p><img src="Samplerate.JPG" alt="image:samplerate.JPG" title="image:samplerate.JPG" width="163" height="31" border="2" class="hcp1"></p>
<p><span class="hcp6">Sample Rate</span>
shows the current sample rate per stereo signal.</p>
<p>Possible values are: -</p>
<ul>
<li class="p"><p class="hcp12">32 kHz</p></li>
<li class="p"><p class="hcp12">44.1
kHz</p></li>
<li class="p"><p class="hcp12">48 kHz
<20> this will also be displayed when the sample
rate is at the pull-down frequency of 47.952kHz</p></li>
<li class="p"><p class="hcp12">88.2
kHz</p></li>
<li class="p"><p class="hcp12">96 kHz
- <span style="font-size: 11.0pt; font-family: Calibri, sans-serif;
mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin;
mso-bidi-font-family: 'Times New Roman';
mso-ansi-language: EN-GB; mso-fareast-language: EN-GB;
mso-bidi-language: AR-SA;">this will also
be displayed when the sample rate is at the pull-down
frequency of 95.904kHz</span> </p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Not Locked</span> -no
signal present</p></li>
<li><span class="hcp6">Out of Range</span>
- signal is present and may be correctly received
but lies outside the legal range for locking outputs</li>
</ul>
<h3>Non-audio LED</h3>
<p><img src="Non-audioLED.JPG" alt="Image:Non-audioLED.JPG" title="Image:Non-audioLED.JPG" width="89" height="19" border="2" class="hcp1"></p>
<p>The Non-audio LED illuminates when the input is
locked but receiving invalid audio. When the Non-Audio
LED is illuminated the audio is muted.</p>
<h3>Error LED</h3>
<p><img src="ErrorLED.JPG" alt="Image:ErrorLED.JPG" title="Image:ErrorLED.JPG" width="60" height="20" border="2" class="hcp1"></p>
<p>The <span class="hcp6">Error LED</span>
illuminates when there is a problem with the incoming
digital stream. Audio may be present but the cause
of the error should be investigated.</p>
<h3>Input Meter</h3>
<p><img src="Inputmeter.JPG" alt="image:inputmeter.JPG" title="image:inputmeter.JPG" width="134" height="354" border="2" class="hcp1"></p>
<p>The Input Meter gives clear input channel metering
and offers the following ballistics properties: -</p>
<ul>
<li class="p"><p class="hcp12"><span class="hcp6">Attack</span> - attack
rate (or speed) of meter</p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Release</span> - release
rate (or speed) of meter</p></li>
<li><span class="hcp6">Reference</span>
- 0dB reference point of meter</li>
</ul>
</div>
<h2>Digital Output Card Configuration</h2>
<div id="div2">
<p><img src="Digitaloutputcardcp.JPG" alt="Image:Digitaloutputcardcp.JPG" title="Image:Digitaloutputcardcp.JPG" width="540" height="671" border="2" class="hcp1"></p>
<p>The Digital Output Card Default Control Panel allows
users to configure, control and monitor a Digital
Output Card.</p>
<h3>Clock Source</h3>
<p><img src="Clocksource.JPG" alt="Image:Clocksource.JPG" title="Image:Clocksource.JPG" width="342" height="162" border="2" class="hcp1"></p>
<p><span class="hcp6">Clock Source</span>
allows the digital outputs per Digital Output Card
to be synchronised to the following variety of clock
sources: -</p>
<ul>
<li class="p"><p class="hcp12">Internal
44.1kHz</p></li>
<li class="p"><p class="hcp12">Internal
48kHz</p></li>
<li class="p"><p class="hcp12">External
44.1kHz/48kHz 75? Terminated</p></li>
<li class="p"><p class="hcp12">External
44.1kHz/48kHz High Impedance</p></li>
<li class="p"><p class="hcp12">Digital
Card A, Channels 1 and 2</p></li>
<li class="p"><p class="hcp12">Digital
Card B, Channels 1 and 2</p></li>
<li class="p"><p class="hcp12">Digital
Card C, Channels 1 and 2</p></li>
<li>Digital Card D, Channels 1 and 2</li>
</ul>
<ul type="disc">
<li><span class="hcp6">Internal -</span>
The main board of the <a href="MAINIntroduction.htm">Soundweb
London</a> device clocks at 48 kHz or 96 kHz.
The internal clock is used for the DSPs and any
analogue cards fitted. Internal clocks are derived
from these frequencies to provide 44.1 kHz or
48 kHz sources. A 1x or 2x multiple of the internal
clock can be output. So to obtain, for example,
a 96 kHz output, a user would select Internal
48 kHz (2 x 48 kHz = 96 kHz).</li>
</ul>
<p style="font-style: italic; margin-left: 40px;">Note:
Since the clock source is specified per digital card,
it is not possible to output 44.1 kHz on one output
pair and 48 kHz on the other. However, this can be
achieved using more than one Digital Output Card.</p>
<ul type="disc">
<li><span class="hcp6">External -</span>
The Digital Output Card will lock to the rate
of the external clock source providing it is 44.1
kHz or 48 kHz. There are two external inputs,
one is 75 ohm terminated and the other is high
impedance.</li>
</ul>
<p class="hcp16"><span class="hcp7">Note:
The external clock source frequency is not measured
by the digital output card so is always labelled 44.1
kHz / 48 kHz. The user is responsible for ensuring
that the external clock frequency is correct.</span></p>
<p class="hcp16">The output clock frequency
of a digital card is a 1x or 2x multiple of the input
clock frequency. To output an 88.2 kHz audio signal
the external source clock frequency must be 44.1 kHz.</p>
<p class="hcp16"><span class="hcp7">Note:
If, for example, the external clock frequency drifts
up to 48 kHz, the output would drift to 96 kHz, even
though the indicated Output Sample Rate is set to
88.2 kHz.</span></p>
<p class="hcp16">If an external clock
frequency is selected but no clock is present, the
Status will indicate 'Warning: not locked'.</p>
<ul type="disc">
<li class="h4"><h4>Digital Card</h4></li>
</ul>
<p class="hcp16">Sync to another digital
card requires that the SyncBus is fitted. &#160;Digital
Output Cards can be synced to any other digital card,
input (channels 1&amp;2) or output. &#160;There are
a number of invalid conditions which are detected
and the status displayed appropriately. These errors
are described under the Status Indicator heading in
the Digital Output Card section.</p>
<ul type="disc">
<li style="font-weight: bold;"><p style="margin-left: 0px;"><a
href="Device&#32;Properties&#32;Pane.html#Clock">Pull-down
Sample rates</a></p></li>
</ul>
<p style="margin-left: 36px;">When synchronising the
BLU link network to an external clock at pull-down
sample rate of 47.952kHz or 95.904kHz via the BNC
connector on the BLU-800/BLU-805/BLU-806 or BLU-320/BLU-325/BLU-326,
the main board of the Soundweb London device(s) will
clock at that frequency.&#160;&#160;This means that
when the digital card syncs to internal 48kHz it will
in fact be running at 47.952kHz and similarly when
it syncs to internal 96kHz it will be running at 95.904kHz.&#160;
</p>
<p class="hcp16"><span class="hcp7">Note:
In the case that an error is displayed, the output
clock will be suppressed resulting in no audio being
output from that channel pair.</span></p>
<h3><span class="hcp6">Source Sample
Rate</span></h3>
<p><img src="Sourcesamplerate.JPG" alt="Image:Sourcesamplerate.JPG" title="Image:Sourcesamplerate.JPG" width="235" height="32" border="2" class="hcp1"></p>
<p><span class="hcp6">Source sample rate</span>
shows the current Source Sample Rate per Digital Output
Card. Possible values are: -</p>
<ul>
<li class="p"><p class="hcp12">32 kHz</p></li>
<li class="p"><p class="hcp12">44.1
kHz</p></li>
<li class="p"><p class="hcp12">48 kHz</p></li>
<li class="p"><p class="hcp12">88.2
kHz</p></li>
<li class="p"><p class="hcp12">96 kHz</p></li>
<li class="p"><p class="hcp12">44.1
kHz / 48 kHz</p></li>
<li>Not Locked</li>
</ul>
<p>&#160;If the clock is locked, the Source Sample
Rate will show the following: -</p>
<ul>
<li class="p"><p><span class="hcp6">Synced
to an internal clock -</span> either 44.1 kHz
or 48 kHz (matching the selected clock source)</p></li>
<li class="p"><p><span class="hcp6">Synced
to an external clock -</span> 44.1 kHz / 48 kHz
(indicating that only those two frequencies are
valid)</p></li>
<li class="p"><p><span class="hcp6">Synced
to an input card -</span> 32 kHz to 96 kHz (matching
the input sample rate of channels 1&amp;2)</p></li>
<li class="p"><p><span class="hcp6">Synced
to an output card -</span> 44.1 kHz to 96 kHz
(matching the output sample rate of channels 1&amp;2)</p></li>
</ul>
<p>&#160;<br>
The Source Sample Rate will show <span class="hcp6">Not
Locked</span> in the following conditions: -</p>
<ul>
<li class="p"><p class="hcp12">Synced
to an external clock and no clock present</p></li>
<li class="p"><p class="hcp12">Synced
to a digital input card which is itself not locked</p></li>
<li>Synced to a digital output card which is itself
not locked for any reason</li>
</ul>
<h3>Output Type</h3>
<p><img src="Outputtype.JPG" alt="Image:Outputtype.JPG" title="Image:Outputtype.JPG" width="154" height="60" border="2" class="hcp1"></p>
<p>Output Type allows AES/EBU or S/PDIF digital outputs
to be selected per stereo signal.</p>
<h3>Output Sample Rate</h3>
<p><img src="Outputsamplerate.JPG" alt="Image:Outputsamplerate.JPG" title="Image:Outputsamplerate.JPG" width="238" height="94" border="2" class="hcp1"></p>
<p>Output Sample Rate allows the output sample rate
to be selected per stereo signal.</p>
<h3>Bypass Sample Rate Conversion</h3>
<p><img src="Bypasssamplerateconversion.JPG" alt="Image:Bypasssamplerateconversion.JPG" title="Image:Bypasssamplerateconversion.JPG" width="134" height="33" border="2" class="hcp1"></p>
<p>Bypass Sample Rate Conversion allows the signal
to bypass the sample rate conversion per stereo signal
in order to improve audio quality for matched sample
rates.</p>
<p><span class="hcp7">Note: For trouble-free
operation of Bypass Sample Rate Conversion, the external
clock must be the same sample rate as the device;
either 48 kHz or 96 kHz and ultimately locked to the
same clock source. If the clocks are not locked drift
may occur, resulting in audible clicks.</span></p>
<h3>Status Indicator</h3>
<p><img src="Notlocked.JPG" alt="Image:Notlocked.JPG" title="Image:Notlocked.JPG" width="242" height="22" border="2" class="hcp1"></p>
<p>The Status Indicator shows one of the following
conditions: -</p>
<ul>
<li class="p"><p class="hcp12">Locked</p></li>
<li class="p"><p class="hcp12">Warning:
Not Locked</p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Error</span>: Attempted
sync to self (1)</p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Error</span>: Attempted
sync to analogue card (2)</p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Error</span>: Attempted
sync to empty slot (3)</p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Error</span>: Incompatible
source/sample rate (4)</p></li>
<li><span class="hcp6">Error</span>:
Attempted sync loop (5)</li>
</ul>
<h4>Error Conditions</h4>
<ul type="disc">
<li>(1) This nonsensical setting is detected</li>
<li>(2) Analogue cards do not provide a clock signal
so an attempt to sync to an analogue card will
not work.</li>
<li>(3) Only other digital cards can provide a
clock source.</li>
<li>(4) Shown when the requested output sample
rate is not a multiple of the source sample rate.
When this is displayed the output signal is also
suppressed. For example, if the clock source is
set to Internal 48 kHz and the Output Sample Rate
set to 44.1 kHz, this error will be displayed.
&#160;If a digital output card is locked to a
digital input card that is receiving a 32 kHz
signal, the incompatible message will display
whatever output sample rate is selected. &#160;If
a digital output card is locked to a digital input
card that is not locked, or out of range, the
incompatible message will display.</li>
</ul>
<p class="hcp16"><span class="hcp7">Note:
If the card is locked to an external clock, indicated
as 44.1 kHz / 48 kHz the card can not detect if the
source and output are compatible. So if the user connects
a 44.1 kHz external clock and selects a 48 kHz output,
the actual output will be 44.1 kHz, and no incompatible
status message will be displayed.</span></p>
<ul type="disc">
<li>(5) If, for example, digital card A is synced
to digital card B which is synced to digital card
A there is a sync loop. Up to 4 cards can be synced
in a circular fashion. All cards involved will
display the sync loop status message. A card that
is synced to a digital output card that is synced
to self will also display the sync loop status
message.</li>
</ul>
<h4>Indicator Colouring</h4>
<ul>
<li class="p"><p class="hcp12"><span class="hcp6">Green</span> - Correct
functionality</p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Orange</span> - Warning
condition, cause should be investigated</p></li>
<li><span class="hcp6">Red</span>
- Error condition, output signal suppressed (user
intervention required)</li>
</ul>
<h3>Output Meter</h3>
<p><img src="Inputmeter.JPG" alt="Image:Inputmeter.JPG" title="Image:Inputmeter.JPG" width="134" height="354" border="2" class="hcp1"></p>
<p>The Output Meter gives clear output channel metering
and offers the following ballistics properties: -</p>
<ul>
<li class="p"><p class="hcp12"><span class="hcp6">Attack -</span> attack
rate (or speed) of meter</p></li>
<li class="p"><p class="hcp12"><span class="hcp6">Release</span> - &#160;release
rate (or speed) of meter</p></li>
<li><span class="hcp6">Reference
-</span> &#160;0dB reference point of meter</li>
</ul>
</div>
</div>
</div>
</div>
</div>
<p class="hcp12">&#160;</p>
</body>
</html>
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