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# CONV-TTL-RS485-RTM-OPT project
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# RS485 to Optical Converter VME RTM
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## Project Description
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### Overview
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The CONV-TTL-RS485-RTM-OPT is a VME rear transition module providing
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The CONV-RS485-OPT-RTM is a VME rear transition module providing
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fiber-optic and electrical inputs and outputs. In combination with the
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[CONV-TTL-RS485](https://www.ohwr.org/project/conv-ttl-rs485/wiki) as
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front-module it provides TTL to optical conversion. The interface with
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... | ... | @@ -37,10 +37,14 @@ Note this is preliminary content. |
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<td>Single mode</td>
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</tr>
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<tr class="odd">
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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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<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="even">
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<tr class="odd">
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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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... | ... | @@ -48,12 +52,12 @@ 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="odd">
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<tr class="even">
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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="even">
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<tr class="odd">
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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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... | ... | @@ -65,15 +69,15 @@ based on current system performance; measurement taken by triggering on the TTL |
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## Project Information
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- [Designs
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notes](https://www.ohwr.org/project/vmr-dio-12ch-opt-a/wikis/design-notes)
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- [Design-notes](Design-notes)
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- [V1-Schematic-Review](V1-Schematic-Review)
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- [V1-PCB-Review](V1-PCB-Review)
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- [Level Conversion
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project](https://www.ohwr.org/project/level-conversion/wiki)
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- [Presentation on level converter
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boards](https://www.ohwr.org/project/level-conversion/uploads/df86ee8c9a2d713a65630a355101cb62/Rennovation_of_level_conversion_boards.pptx)
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- "Presentation on design spécification"
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- [Presentation on design
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specification](https://www.ohwr.org/project/conv-rs485-opt-rtm/uploads/fad87a0c131e53521c515f10892e44f1/opt-repeater-design.pptx)
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-----
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... | ... | @@ -103,7 +107,7 @@ based on current system performance; measurement taken by triggering on the TTL |
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</tr>
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<tr class="even">
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<td>08-12-2017</td>
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<td>Meeting an <a href="https://www.ohwr.org/project/conv-rs485-opt-rtm/wikis/Documents/Presentation-on-optical-repeater-design">presentation</a> to <a href="https://www.ohwr.org/project/conv-rs485-opt-rtm/uploads/2edd6bbeb4d50cc81522850baf2f3ef7/Outcome_of_meeting_on_optical_repeater_design.htm">discuss</a> design choices and outstanding issues</td>
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<td>Meeting and <a href="https://www.ohwr.org/project/conv-rs485-opt-rtm/wikis/Documents/Presentation-on-optical-repeater-design">presentation</a> to <a href="https://www.ohwr.org/project/conv-rs485-opt-rtm/uploads/2edd6bbeb4d50cc81522850baf2f3ef7/Outcome_of_meeting_on_optical_repeater_design.htm">discuss</a> design choices and outstanding issues</td>
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</tr>
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<tr class="odd">
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<td>15-12-2017</td>
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