Difference between revisions of "Cabling and Wiring"

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In a mocap system, multiple cameras and cables are incorporated. If the system is in a large scale, it could be difficult to figure out how each component is connected. Furthermore, without having a technical understanding, the cabling might not be explicit. This page provides instructions and important consideration when cabling for the OptiTrack mocap system. There are two different cabling modes in the OptiTrack mocap system, USB-based and Ethernet-based, and each system requires different cable connection configurations.
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This page provides suggestions to consider when cabling and wiring an OptiTrack motion capture system. There are two different types of OptiTrack mocap systems, USB-based and Ethernet-based, and each system requires different cable connection configurations.
  
  
  
 
==Ethernet Camera System==
 
==Ethernet Camera System==
The Ethernet-based camera system networks via Ethernet cables. Ethernet cables not only offer faster data transfer rates, but they also provide power over Ethernet to each camera while transferring the data to the host PC. This reduces amount of required cables and simplifies the overall setup. Furthermore, Ethernet cables have much longer length limitations (up to 100m), allowing the systems to cover large volumes. Ethernet cameras include Prime series cameras and Slim 13E cameras.
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An Ethernet-based camera system networks via Ethernet cables. Ethernet cables not only offer faster data transfer rates, but they also provide power over Ethernet to each camera while transferring the data to the host PC. This reduces amount of required cables and simplifies the overall setup. Furthermore, Ethernet cables have much longer length capability (up to 100m), allowing the systems to cover large volumes. Ethernet cameras include Prime series cameras and Slim 13E cameras.
  
  
  
 
===Network Setup===
 
===Network Setup===
Ethernet cameras connect to the computer through a Gigabit (1000 Mb/second) Ethernet port. Camera network should be isolated from other networks. Note that camera network traffic should be segmented from the office or other local area networks to avoid interference and congestion. If the computer used for capture is connected to an existing network, then a second Ethernet port or add-on network card can be used to connect the camera network. When the camera network is not isolated, frame drops may occur.
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Ethernet cameras connect to the host computer through a Gigabit (1000 Mb/second) Ethernet port. Note: the camera network should be segmented from the office or other local area networks to avoid interference and congestion. If the computer used for capture is connected to an existing network, then a second Ethernet port or add-on network card can be used to connect the camera network. When the camera network is not isolated, frame drops may occur.
  
  
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===Ethernet Cable Types===
 
===Ethernet Cable Types===
There are multiple categories for Ethernet cables. Each category has different specifications for maximum data transmission rate and maximum cable length. Generally, there is a tradeoff relationship between transmission rate and cable length. Longer cables may have degraded data transmission rate. For the Ethernet system, Gigabit Ethernet cables that are category 6 or above should be used. 10 Gigabit Ethernet cables – Cat6e, Cat6a, and Cat7 — are recommended in conjunction with a 10 Gigabit uplink switch for the connection between the uplink switch and the host PC in order to accommodate for the high data traffic.  
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There are multiple categories for Ethernet cables, and each has different specifications for maximum data transmission rate and cable length. For an Ethernet based system, category 6 or above Gigabit Ethernet cables should be used. 10 Gigabit Ethernet cables – Cat6e, Cat6a, and Cat7 — are recommended in conjunction with a 10 Gigabit uplink switch for the connection between the uplink switch and the host PC in order to accommodate for the high data traffic. C
  
  
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====Ethernet PoE Switches====
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====Power over Ethernet (PoE/PoE+) Switches====
OptiTrack’s Ethernet cameras require PoE, or PoE+, Gigabit Ethernet switches. The switch transfers camera data to a host PC and also supplies power to each camera over the Ethernet cable (PoE). The switch must provide consistent power to every port simultaneously in order to power each camera. Standard PoE switches must provide a full 15.4 watts to every port simultaneously. Prime 17W and Prime 41 cameras have stronger IR strobes which require higher power for the maximum performance. In this case, these cameras need to be routed through PoE+ switches that provide a full 25 watts of power to every port simultaneously. Note that PoE Midspan devices or power injectors are not suitable for Ethernet camera systems.   
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OptiTrack’s Ethernet cameras require PoE or PoE+ Gigabit Ethernet switches, depending on the camera's power requirement. The switch serves two functions: transfer camera data to a host PC, and supply power to each camera over the Ethernet cable (PoE). The switch must provide consistent power to every port simultaneously in order to power each camera. Standard PoE switches must provide a full 15.4 watts to every port simultaneously. Prime 17W and Prime 41 cameras have stronger IR strobes which require higher power for the maximum performance. In this case, these cameras need to be routed through PoE+ switches that provide a full 30 watts of power to each port simultaneously. Note that PoE Midspan devices or power injectors are not suitable for Ethernet camera systems.   
  
  
 
====eSync====
 
====eSync====
 
[[Image:eSync2.jpg|thumb|The eSync 2 output and input ports descriptions]]
 
[[Image:eSync2.jpg|thumb|The eSync 2 output and input ports descriptions]]
The eSync is used for synchronization and timecode for Ethernet-based mocap systems. Only one device is needed per system, and it enables you to link the system to almost any signal source. It has multiple synchronization ports which allow integrating external signals from other devices. When an eSync is used, it is considered as the master in the synchronization chain.
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The eSync is used to enable synchronization and timecode in Ethernet-based mocap systems. Only one device is needed per system, and it enables you to link the system to almost any signal source. It has multiple synchronization ports which allow integrating external signals from other devices. When an eSync is used, it is considered as the master in the synchronization chain.
  
 
[[Image:Wiring_Ethernet_One.png|center|700px]]
 
[[Image:Wiring_Ethernet_One.png|center|700px]]
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====Uplink Switch====
 
====Uplink Switch====
If the number of cameras included in the system exceeds the number of ports available from the switch, a star topology setup with an switch connecting subsequent switches will be required. In this case, large amounts of data will be transferred through the uplink switch. In order to cope high bandwidth, it is recommended use the 10 Gigabit uplink switch and connect to the host PC with a 10 Gigabit cable – Cat6a, Cat6e, and Cat7. Otherwise, system latency would increase and frame drops may occur.
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If the number of cameras included in the system exceeds the number of ports available from the switch, a star topology setup with an uplink switch connecting subsequent switches will be required. In this case, large amounts of data will be transferred through the uplink switch. In order to cope high bandwidth, it is recommended use the 10 Gigabit uplink switch and connect to the host PC with a 10 Gigabit cable – Cat6a, Cat6e, and Cat7. Otherwise, system latency can increase and frame drops may occur.
  
  
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==USB Camera System==
 
==USB Camera System==
The USB camera system provides high quality motion capture for small to medium size volumes at an affordable price range. USB camera models include Flex series (Flex 3 and Flex 13) and Slim 3U. USB cameras are powered by the OptiHub, which is designed to maximize the capacity of Flex series cameras by providing sufficient power to each camera, allowing tracking at long ranges. The USB system is not suitable for a large volume setup because USB 2.0 cables have a 5 meter length limitation. For connecting the host PC and the OptiHub, up to two active USB extensions can be used, but the extensions should not be used for connecting the OptiHub and the cameras. When incorporating multiple OptiHubs in the system, connect RCA synchronization cables in between each hub.
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A USB camera system provides high quality motion capture for small to medium size volumes at a relatively (compared to Ethernet cameras) affordable price range. USB camera models include the Flex series (Flex 3 and Flex 13) and Slim 3U. USB cameras are powered by the OptiHub, which is designed to maximize the capacity of Flex series cameras by providing sufficient power to each camera, allowing tracking at long ranges. A USB system is not suitable for a large volume setup because the USB 2.0 cables used to wire the cameras have a 5 meter length limitation. When (and only when) connecting the OptiHub to the host PC, up to two active USB extensions can be used as needed. When incorporating multiple OptiHubs in the system, use RCA synchronization cables to interconnect each hub.
  
{{Tip|Tracking Bars — V120:Duo and V120:Trio — are also USB camera models but they have cameras already integrated in the product, and therefore, its USB hub is directly connected to the host PC without routing through the OptiHub.}}
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{{Tip|Tracking Bars — V120:Duo and V120:Trio — are also USB camera models, but they feature an integrated hub and cameras. Therefore, their USB output is directly connected to the host PC without routing through the OptiHub.}}
  
  
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'''OptiHub'''
 
'''OptiHub'''
 
[[Image:OptiHub.PNG|thumb|OptiHub 2 for USB camera systems.]]
 
[[Image:OptiHub.PNG|thumb|OptiHub 2 for USB camera systems.]]
The OptiHub is a custom-engineered USB hub that is design to be incorporated in the USB camera system. It is designed to provide power and external synchronization options. Standard USB ports do not provide enough power for the IR illumination for Flex 13 cameras and they need to be routed through an OptiHub in order to activate the LED array.
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The OptiHub is a custom-engineered USB hub that is designed to be incorporated in a USB camera system. It provides both power and external synchronization options. Standard USB ports do not provide enough power for the IR illumination within Flex 13 cameras and they need to be routed through an OptiHub in order to activate the LED array.
  
  

Revision as of 19:45, 25 February 2016

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This page provides suggestions to consider when cabling and wiring an OptiTrack motion capture system. There are two different types of OptiTrack mocap systems, USB-based and Ethernet-based, and each system requires different cable connection configurations.


Ethernet Camera System

An Ethernet-based camera system networks via Ethernet cables. Ethernet cables not only offer faster data transfer rates, but they also provide power over Ethernet to each camera while transferring the data to the host PC. This reduces amount of required cables and simplifies the overall setup. Furthermore, Ethernet cables have much longer length capability (up to 100m), allowing the systems to cover large volumes. Ethernet cameras include Prime series cameras and Slim 13E cameras.


Network Setup

Ethernet cameras connect to the host computer through a Gigabit (1000 Mb/second) Ethernet port. Note: the camera network should be segmented from the office or other local area networks to avoid interference and congestion. If the computer used for capture is connected to an existing network, then a second Ethernet port or add-on network card can be used to connect the camera network. When the camera network is not isolated, frame drops may occur.


Note: Turn off your computer's firewall for the particular network in order to connect the camera network to the host PC.



Ethernet Cable Types

There are multiple categories for Ethernet cables, and each has different specifications for maximum data transmission rate and cable length. For an Ethernet based system, category 6 or above Gigabit Ethernet cables should be used. 10 Gigabit Ethernet cables – Cat6e, Cat6a, and Cat7 — are recommended in conjunction with a 10 Gigabit uplink switch for the connection between the uplink switch and the host PC in order to accommodate for the high data traffic. C


Cabling the Ethernet System

Main components included in the Ethernet based system:

  • Host PC with an isolated network
  • Ethernet Cameras
  • Ethernet cables
  • Ethernet PoE/PoE+ Switches
  • Uplink switch (for large camera count setup)
  • The eSync (optional for synchronizations)


Power over Ethernet (PoE/PoE+) Switches

OptiTrack’s Ethernet cameras require PoE or PoE+ Gigabit Ethernet switches, depending on the camera's power requirement. The switch serves two functions: transfer camera data to a host PC, and supply power to each camera over the Ethernet cable (PoE). The switch must provide consistent power to every port simultaneously in order to power each camera. Standard PoE switches must provide a full 15.4 watts to every port simultaneously. Prime 17W and Prime 41 cameras have stronger IR strobes which require higher power for the maximum performance. In this case, these cameras need to be routed through PoE+ switches that provide a full 30 watts of power to each port simultaneously. Note that PoE Midspan devices or power injectors are not suitable for Ethernet camera systems.


eSync

The eSync 2 output and input ports descriptions

The eSync is used to enable synchronization and timecode in Ethernet-based mocap systems. Only one device is needed per system, and it enables you to link the system to almost any signal source. It has multiple synchronization ports which allow integrating external signals from other devices. When an eSync is used, it is considered as the master in the synchronization chain.

Wiring Ethernet One.png
Ethernet system with one Ethernet Switch

Uplink Switch

If the number of cameras included in the system exceeds the number of ports available from the switch, a star topology setup with an uplink switch connecting subsequent switches will be required. In this case, large amounts of data will be transferred through the uplink switch. In order to cope high bandwidth, it is recommended use the 10 Gigabit uplink switch and connect to the host PC with a 10 Gigabit cable – Cat6a, Cat6e, and Cat7. Otherwise, system latency can increase and frame drops may occur.


Wiring Ethernet.png
Ethernet system with more than one Ethernet PoE switches

USB Camera System

A USB camera system provides high quality motion capture for small to medium size volumes at a relatively (compared to Ethernet cameras) affordable price range. USB camera models include the Flex series (Flex 3 and Flex 13) and Slim 3U. USB cameras are powered by the OptiHub, which is designed to maximize the capacity of Flex series cameras by providing sufficient power to each camera, allowing tracking at long ranges. A USB system is not suitable for a large volume setup because the USB 2.0 cables used to wire the cameras have a 5 meter length limitation. When (and only when) connecting the OptiHub to the host PC, up to two active USB extensions can be used as needed. When incorporating multiple OptiHubs in the system, use RCA synchronization cables to interconnect each hub.

Tracking Bars — V120:Duo and V120:Trio — are also USB camera models, but they feature an integrated hub and cameras. Therefore, their USB output is directly connected to the host PC without routing through the OptiHub.



Cabling the USB System

Wiring USB.png

OptiHub

OptiHub 2 for USB camera systems.

The OptiHub is a custom-engineered USB hub that is designed to be incorporated in a USB camera system. It provides both power and external synchronization options. Standard USB ports do not provide enough power for the IR illumination within Flex 13 cameras and they need to be routed through an OptiHub in order to activate the LED array.


OptiSync

OptiSync is a custom synchronization protocol which allows sending the synchronization signals through the USB cable. It allows the USB system to have one USB cable for each camera instead of having separate USB and RCA synchronization cables.


USB Load Balancing

When connecting hubs to the computer, load balancing becomes important. Most computers have several USB ports on the front and back, all of which go through two USB controllers. It is recommended (especially in larger camera count systems) that you evenly split the cameras between the USB controllers to make the best use of the available bandwidth.



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