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Mar 30, 2020 | view(s) | people thought this was helpful

Low-Bandwidth Errors in Cisco Webex Video Platform Meetings

Common causes and resolutions to Low-Bandwidth messages.

Low-Bandwidth errors in Cisco Webex Video Platform meetings.

I get a low-bandwidth error when I try to view video from TelePresence users.

How do I troubleshoot 'low-bandwidth' errors in Cisco Webex Video Platform?

I can see a yellow triangle warning icon instead of video in my Cisco Webex Video Platform meeting.

Error: 'Due to low-bandwidth or local computer conditions (such as CPU or RAM use), video is not currently available'


Note:

  • Low-bandwidth error messages vary for mobile and desktop clients.
  • If network conditions improve after you receive the warning, the video test will automatically refresh and this allows you to potentially re-gain video in the Webex meeting.
Cause:

The low-bandwidth warnings appear if a participant's network connection falls below the minimum requirements for video.

Video quality automatically downgrades to lower resolutions for users on slower connections. Minimum requirement for video is 180p.

Possible causes of low bandwidth warnings:

  • Use of Transmission Control Protocol (TCP) for video instead of User Datagram Protocol (UDP).
  • Other running applications: Email and Virtual private network (VPN) clients, Virtualization sessions.
  • Use of a wireless (Wi-Fi) instead of wired local-area network (LAN) connection.
  • Mobile devices: iPhones/iPads using a 3G/4G connection instead of a Wi-Fi.
  • Less than 400 to 500 Kbps download speed from internet.

Example scenario: Cisco Webex Video Platform meetings scales the video quality down to lowest common denominator of users who are at or above the minimum video quality (180p). This means that video quality downgrades for the rest of the Webex attendees based on the slowest connection above the minimum video quality. For example, if a single participant has joined from an iPhone 4 which is only capable of receiving at 90p, that user will not receive video and only that user receives the 'Low-bandwidth warning' from TelePresence endpoints who are the active speaker in the meeting. The next highest user above the minimum video quality (180p) sets the lowest common denominator for all Webex participants to receive from TelePresence.

Solution:

For the best video experience in Cisco Webex Video Platform meetings, each screen must have at least 2.0 Mbps bandwidth (bi-directional, i.e. sending and receiving).

Warnings and errors are received if your available bandwidth falls below the minimum required for Cisco Webex Video Platform (1.2 Mbps).

To view the warning messages, see: Low Bandwidth Warnings.PDF

To fix the issue, try the following:

  • Ensure that your internet bandwidth meets the minimum requirement for Cisco Webex Video Platform. For help, see:
  • Ensure the UDP ports on your network connection are open for CMR (Using TCP is not recommended for Webex client attendees only) - does not pertain to TelePresence. For help, see: WBX264 - How Do I Allow Webex Meetings Traffic on My Network?
  • Try using a wired connection over a Wi-Fi connection.
  • Close out of any other applications that can be using your Internet bandwidth (e.g. email, VPN clients).
  • Also close any resource-intensive applications to free up the memory and Central processing unit (CPU).

After you correct the problem with your network connection, video will resume automatically.

For a complete reference to configure Cisco Webex Video Platform, see:


 

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