... | ... | @@ -19,10 +19,20 @@ transmitters. |
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![](/uploads/b14c2793a5f586fa46be605b8cc0baf8/conv-rs485-opt-rtm.png)
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The design is based on the existing modules: optical transmitter
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[CTDAB](https://wikis.cern.ch/display/HT/CTDAB+-+Laser+pulse+transmitter)
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and optical receiver
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[CTDPR](https://wikis.cern.ch/display/HT/CTDPR+-+Optical+fiber+pulse+receiver).
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The design is based on the following existing modules:
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<table>
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<tbody>
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<tr class="odd">
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<td>optical transmitter</td>
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<td>[CTDAB](https://wikis.cern.ch/display/HT/CTDAB+-+Laser+pulse+transmitter)</td>
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</tr>
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<tr class="even">
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<td>optical receiver</td>
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<td>[CTDPR](https://wikis.cern.ch/display/HT/CTDPR+-+Optical+fiber+pulse+receiver)</td>
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</tr>
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</tbody>
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</table>
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-----
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... | ... | @@ -37,26 +47,30 @@ Note this is preliminary content. |
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<td><strong>Value</strong></td>
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</tr>
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<tr class="even">
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<td>*Number of channels</td>
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<td><strong>Number of channels</strong></td>
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<td>3</td>
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</tr>
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<tr class="odd">
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<td><strong>Optical output fan-out</strong></td>
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<td>2</td>
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<td><strong>Optical inputs per channel</strong></td>
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<td>1</td>
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</tr>
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<tr class="even">
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<td><strong>Optical outputs per channel</strong></td>
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<td>2</td>
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</tr>
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<tr class="odd">
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<td><strong>Supported fiber type</strong></td>
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<td>Single mode</td>
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</tr>
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<tr class="odd">
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<tr class="even">
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<td><strong>Fiber connector</strong></td>
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<td>ST</td>
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</tr>
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<tr class="even">
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<tr class="odd">
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<td><strong>Allowed attenuation</strong></td>
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<td>max 10dB (10km fiber with 10 connections)</td>
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</tr>
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<tr class="odd">
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<tr class="even">
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<td><strong>Optical signal characteristics</strong></td>
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<td>Transmission/ Reception of CERN's GMT signal (500 kHZ DC balanced signal) and of single pulses:<br />
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Minimum pulse width: 100 ns<br />
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... | ... | @@ -64,12 +78,12 @@ Maximum frequency: 1 MHz<br /> |
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Maximum pulse width: 1 ms<br />
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Minimum frequency: None, as long as maximum pulse width is respected</td>
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</tr>
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<tr class="even">
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<tr class="odd">
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<td><strong>Latency due to electronics</strong></td>
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<td>14 ns<br />
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based on current system performance; measurement taken by triggering on the TTL input of the optical transmitter and measuring at the TTL output of the optical receiver, using only few cm of fiber</td>
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</tr>
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<tr class="odd">
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<tr class="even">
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<td><strong>Jitter due to electronics</strong></td>
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<td><10 ns<br />
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based on current system performance; measurement taken by triggering on the TTL input of the optical transmitter and measuring at the TTL output of the optical receiver, using only few cm of fiber</td>
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