About the Group Telepresence 3351 codec
Installing Group Telepresence 3351Last updated April 7, 2021
In this topic:
- Connectors and ports
- Using the correct HDMI and DVI cables
- Connecting your laptop to the codec
- Audio connectors and voltage levels
- Extending the camera cables
The figure below shows the connectors on the rear of the Group Telepresence 3351 codec.
The table below describes the connectors:
|Microphone||XLR-F connectors. Connect the microphone to Microphone 1. You can connect an additional microphone to Microphone 2. You can alter the power and volume settings of the microphone via the StarLeaf Portal (refer to Advanced settings)|
|Audio In||3.5mm line level stereo audio connector. You can connect a line level microphone source or input other audio, for example a computer. In either case, ensure you have the correct settings for audio in the Portal. For more information, refer below and to Audio settings for Group Telepresence|
|Audio Out||3.5mm stereo audio connector. If required, you can connect to a local loudspeaker system. You can alter the line-out audio settings via the StarLeaf Portal (refer to Audio settings for Group Telepresence). For more information about the connector, refer below this table|
|COM1||COM 1 is reserved. Do not connect to COM1|
|COM2||This port is for a 4P4C connector providing an RS-232 interface. This is the same connector used in RJ9, RJ10, and RJ22. There is a both a serial and an IP API option for the GT.
|Camera Control x3||Mini-DIN-8 connectors for controlling zoom, pan, and tilt using VISCA™ protocol. Connect a supported PTZ video conferencing camera to Camera Control 1. You can connect additional supported PTZ cameras to Camera Control 2 and 3. Select which camera to use via the home screen of the touchscreen controller. For more information, refer to About the camera|
|Camera In x3||HDMI connectors. Connect a supported PTZ video conferencing camera to Camera In 1. You can connect additional supported PTZ cameras to Camera In 2 and 3. Select which camera to use via the home screen of the touchscreen controller. For more information, refer to About the camera|
|Computer In||DVI-I connector. Connect a PC or other device to share content in a video call or locally. If audio-in is enabled on this connector, audio can also be shared from the connected device when connected using an HDMI-DVI-I connector. From Cloud 7.1, audio-in on this DVI-I connector is enabled by default. If your room system pre-dates Cloud 7.1, contact StarLeaf Support to enable audio-in on this connector|
|Video Out HDMI x2||HDMI connectors. Video Out connector A outputs both audio and video (1080p60 only) to the screen. If you are connecting a second screen, connect it to HDMI Out B|
|USB||You can connect Pronto Cable USB to instantly share content from your laptop, and synchronize your StarLeaf meetings. For more information, go to
|Network||10/100/1000 Mbit/s auto-sensing Ethernet port. Connect to the network|
|StarLeaf Phone/Controller||Connect to the PoE port on the rear of the touchscreen controller to both power the touchscreen controller and to allow communication between the touchscreen controller and the codec|
|+48V power||Connect to the supplied AC/DC adaptor|
There are LEDs on the network port and the StarLeaf Phone/Controller port of the codec indicating the status of the network link, and the link to the StarLeaf touchscreen controller. LED behavior is described in LED behavior for GT Mini.
|Width||420 mm||16.55 in.|
|Depth||332.5 mm||13.10 in.|
|Height (with feet attached)||94.5 mm||3.75 in.|
When connecting HDMI or DVI cables to the camera inputs, the PC input, and the telepresence screen display outputs, ensure you use the correct gauge of HDMI/DVI cable. For short cable lengths of up to 5m (17 feet), use 28AWG or thicker core. For longer lengths, use 24AWG or thicker. StarLeaf does not support the use of HDMI or DVI cables of longer than 15m (49 feet) with the codec.
You can connect your laptop, in order to share content, in one of two ways:
StarLeaf Pronto allows users to meet and share in an instant. When you connect Pronto to your laptop, your screen and audio are shared with the room so that you are ready to present immediately. Your StarLeaf meetings are also synchronized with the room, allowing you to join with one touch.
Connect the DVI-I to DVI-I cable to Computer-In DVI-I on the rear of the codec. For the convenience of the Group Telepresence users, leave the other end of the cable on the meeting room table. This allows users to connect a laptop to the Group Telepresence system when they need to do so. The Group Telepresence system includes a selection of adaptors to be used with the DVI-I to DVI-I cable where the video output of a PC is other than DVI-I (for example, VGA, HDMI, DVI-D).
If you are using external equipment to connect the GT 3351 to your microphones, you need to be aware of the required audio voltage levels for XLR, audio line-in, and audio line-out:
- XLR Mic in sensitivity -40dBu to -13dBu (The StarLeaf Portal 0dB gain setting is equivalent to -13dBu)
- 3.5mm Line in sensitivity -16dBu to +12dBu (The StarLeaf Portal 0dB setting is equivalent to +7dBu)
- 3.5mm Line out range -40dBu to +2 dBu (The StarLeaf Portal 0dB gain setting is equivalent to +2dBu)
You can further configure the digital amplification of the GT 3351 from the StarLeaf Portal. Go to Room Systems > Edit room system > Audio and video settings.
Phantom power is compatible with active microphones that are designed for 48V phantom power. The following are specifications of the power supply:
- Output voltage when operational, no load is 45.3V +/- 4%
- Output voltage when muted, no load is 35.3V +/- 4%
- Power output source impedance is 1.975kOhms +/- 2%
All StarLeaf room systems use a standard 3.5mm connector:
Left signal = tip
Right signal = middle
Ground = back
StarLeaf room systems that use a PTZ camera are provided with camera connection cables of 5m in length. If you need to install the camera further than 5m from the room system, you must extend those cables.
You can extend those cables using a third-party product called an extender. This product effectively carries the media and camera-control signals across a cat 6 Ethernet cable.
StarLeaf has partnered with Sound Control Technologies to provide this solution which is available at https://www.soundcontrol.net/solutions/#