In this topic:

Connectors and ports

The figure below shows the connectors on the rear of the Group Telepresence 3330 (GT Mini) codec.

The table below describes the connectors:

Connector Description
Microphone XLR-F connectors. Connect the microphone. You can alter the power and gain settings of the microphone via the StarLeaf Portal (refer to Audio settings for Group Telepresence)
Audio line-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 How to install GT Mini 3330
Audio line-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
COM 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 both a serial and an IP API option for the GT Mini and a StarLeaf Room Systems API guide is available
Camera control Mini-DIN-8 connector for controlling zoom, pan, and tilt using VISCA™ protocol. You connect to this port if you are using a PTZ video conferencing camera. For more information, refer to About the camera
Camera input HDMI connector. You connect to this port if you are using a PTZ video conferencing camera. 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 port B
USB x2 You can connect Pronto Cable USB to instantly share content from your laptop, and synchronize your StarLeaf meetings. For this you must use the top USB port on the codec. For more information, see Installing Pronto Cable USB. If you are using a USB webcam, you can connect it to either port
Network 10/100/1000 Mbit/s auto-sensing Ethernet port. Connect to the network
StarLeaf Controller Only Connect to the PoE port on the rear of the StarLeaf 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 Controller Only 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.

Older models of GT Mini have HDMI ports labeled 1 and 2. In this case, plug screen 1 into port 2.

Using the correct HDMI and DVI cables

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.

Connecting your laptop to the codec

You can connect your laptop, in order to share content, in one of two ways:

StarLeaf Pronto

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.

Go to Installing Pronto Cable USB for more information.

DVI-I cable

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).

Audio connectors and voltage levels

The audio voltage levels used by the XLR inputs, audio line-in and audio line-out are specified in the tables below. These levels can be adjusted in Portal > Room system > Edit room system > Audio and video settings.

For inputs, the table specifies the:

  • maximum levels supported (for minimum Portal gain setting)
  • maximum levels supported for the default Portal gain setting of 0dB
  • maximum levels supported for the maximum Portal gain setting
Input Max level Max level at Portal 0dB Portal max gain Max level at Portal max gain
XLR in -17dBu -17dBu +30dB -47dBu
Line in +8dBu +2dBu +30dB -28dBu

For outputs, the table specifies the:

  • maximum levels provided (for maximum Portal gain setting)
  • maximum levels provided for the default Portal gain setting of 0dB
  • maximum levels provided for the minimum Portal gain setting
Output Max level Max level at Portal 0dB Portal min gain Max level at Portal min gain
Line out +2dBu +2dBu -70dB -68dBu

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%

3.5mm audio connector pinout

All StarLeaf room systems use a standard 3.5mm connector:

Left signal = tip

Right signal = middle

Ground = back

Extending the camera cables

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