Minimal and Optimal bandwidth for Cisco Roomkit plus

[a-latoszek]

Dear Colleagues,

Is someone aware about minimal and optimal bandwidth of Cisco Room kit plus 1080p sip/h323 camera + presentation
We encounter problems during conferences and bandwidth is set in stone for 3Mbps (by the server site) -> I'm looking for an confirmation that it is not enough.

video is dropping from 1080p to even 800x600, blurry image, packet losses. cisco is showing full bandwidth use.

Regards

[pieterh]

for older systems 2Mbps was enough
but according to the page below, advised bandwith for modern systems is 20Mbps:
https://help.webex.com/en-us/article/51qu5cb/Bandwidth-management-for-Board,-Desk,-and-Room-Series 

Webex Meetings and Webex Webinars support up to 1080p main video and 4K content video. The Webex bandwidth usage is dynamic and depends on the scenario. This applies to all calls and meetings, from a 1:1 call with bandwidth based on the far-end camera quality (for example 720p at 2 Mbps) up to multiple streams of 1080p at 6 Mbps. The bandwidth that is used by Webex is dynamically split across the main video and shared content, the number of screens available, and the current layout to provide the best experience in any scenario.

[Joseph W. Doherty]

From: https://help.webex.com/en-us/article/51qu5cb/Bandwidth-management-for-Board,-Desk,-and-Room-Series

Low bandwidth scenarios

Cisco collaboration devices are designed to work seamlessly across a range of network conditions, including low bandwidth or high latency connections, meaning media quality adjusts automatically to maintain an optimal user experience. This is accomplished through several different mechanisms, including dynamic adjustment of video resolution, frame rate, and audio quality. For example, if network bandwidth is limited, the device may automatically reduce the resolution of the video being sent or decrease the number of frames per second to reduce the amount of data being sent.

If you wish to manually configure the maximum allowable bandwidth consumption, we recommend a minimum bandwidth of 4000 kb/s to ensure good quality for main video and content video. This is the minimum bandwidth that is required to support high-quality Full-HD video (1080p) streams with a frame rate of 30 frames per second for the main video and content streams. While the devices support video conferencing at lower bandwidths, the end-user experience is improved for a large proportion of use cases around this threshold.

When configuring the bandwidth on devices, we recommended that you keep the single-screen devices within a range of 6–12 Mbps and the dual/triple-screen systems within 10–20 Mbps for a balanced premium experience. The minimum recommended bandwidth is 4 Mbps.

From the forgoing, 3 Mbps appears insufficient, which appears to be confirmed by both your mention that full bandwidth is being shown as being used and the resultant (poor) video quality.