Expressway bandwidth configuration

[Rajkumar Yadav]

Hi,

Can anyone let me know is it required to change the bandwidth configuration on the Expressway C and E server.

I have endpoints MX800, DX 80, EX80 and C60, will this impact the quality of conferencing and B2B video calls.

I also have the TMS, is it require to also change the bandwidth on TMS.

On conductor i have configured HD for scheduled conference call.

Bandwidth restrictions: The Maximum Session Bit Rate for Video Calls on the default region on Cisco Unified Communications Manager is 384 kbps by default. The Default call bandwidth on Expressway-C is also 384 kbps by default. These settings may be too low to deliver the expected video quality for the DX Series.

http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/admin_guide/Cisco-Expressway-Administrator-Guide-X8-7.pdf

Regards,

Raaj

[Manish Gogna]

Hi Raaj,

Plz check the Advanced settings section on page 151 of the following link for TMS bandwidth settings , it tells under which conditions this bandwidth or cucm bandwidth settings is used

http://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/tms/admin_guide/Cisco_TMS_Admin_Guide_14-1.pdf

IP Bandwidth
IP Bandwidth is preset in Administrative Tools > Configuration > Conference Settings > Conference Create Options section, Default Bandwidth field.
This bandwidth will be the default used in a scheduled conference but can be changed during booking.
Systems that have an upper limit lower than IP Bandwidth will connect using their maximum bandwidth.
IP Bandwidth range is from 64kbps to 6144kbps.
Bandwidth restrictions put in place by call control infrastructure will override this setting.
Note: This does not apply to CTS and TX systems - it is not possible to specifiy the bandwidth a CTS or TX system uses in a call from Cisco TMS.

ISDN Bandwidth
ISDN Bandwidth is preset in Administrative Tools > Configuration > Conference Settings > Conference Create Options section, Default ISDN Bandwidth field.
This bandwidth will by default be used in a scheduled conference but can be changed during booking.
Systems that have an upper limit lower than ISDN Bandwidth, will connect using their maximum bandwidth.
The first digits denote the number of b-channels. The second number is the bandwidth in kbps. The range is from 64kbps to 4096kbps.

For CUCm and conductors its explained on page 5-6 here

http://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/conductor/config_guide/Cisco_TelePresence_Conductor_with_Cisco_Unified_CM_Deployment_Guide_XC2-2.pdf

For Expressway you can check the following post

https://supportforums.cisco.com/discussion/12451591/expressway-default-call-bandwidth-kbps

Manish

[Rajkumar Yadav]

Hi Manish,

Thank you for the reply.

I would like to know where exactly the preference is taken?

I mean i know device itself will send the best bandwidth to achieve the video call.

For example if any device which is have capacity of 6000 Kbps and if send this to call setup.

Will it given  preference or per hop the bandwidth would be negotiated.

For CM centric approach MX800 will send 6000Kbps and in CUCM it allowed for 32256 Kbps and then it goes to TMS and Expressway too for completeing the scheduled conference.

Regards,

Raaj

[Manish Gogna · Accepted solution]

Hi Raaj,

From cucm perspective, it is a function of region settings. As explained with a couple of examples in the SRND

When a video call is established between two video endpoints, audio and video streams are established and bandwidth is deducted for the negotiated rate. Unified CM uses regions to determine the maximum bit rate for the call. For example, with a Cisco TelePresence System EX90 at the highest detail of 1080p at 30 frames per second (fps), the negotiated rate between regions would have to be set at 6.5 Mbps. EX90s used in this scenario would average around 6.1 Mbps for this session. When the endpoints start presentation sharing during the session, BFCP is negotiated between the endpoints and a new video stream is enabled at either 5 fps or 30 fps, depending on endpoint configuration. When this occurs, the endpoints will throttle down their main video stream to include the presentation video so that the entire session does not use more than the allocated bandwidth of 6.5 Mbps. Thus, the average bandwidth consumption remains the same with or without presentation sharing.


Telepresence immersive and office endpoints such as the Cisco TelePresence System 500, 1000, 3000, and TX9000 Series that negotiate a call between one another function a little differently in the sense that the video for presentation sharing is an additional bandwidth above and beyond what is allocated for the main video session, and thus it is not deducted from Enhanced Location CAC.

More details are given here

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab09/clb09/cac.html#pgfId-1594247

Also, as specified in the previous post "Bandwidth restrictions put in place by call control infrastructure will override this setting." , it means that for endpoints registered with cucm the cucm setting will take preference.

Manish

[Rajkumar Yadav]

Thank you Manish.

As I understood.

For CM centric Approach its my region, (LBM) setting with decide the Bandwidth for the Video call.

Cheers,

Raaj