Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

IP mcu x ISDN mcu

What is the difference between an IP MCU and an ISDN MCU in terms of mixing audio and video? I ask that because the bandwidth in an IP MCU is x times the number of endpoint (x=number of endpoints) and in the ISDN world it doesn´t happen. Is it a limitation of the IP codec ?

4 REPLIES
New Member

Re: IP mcu x ISDN mcu

There are not many differences between IP and ISDN based MCUs except for the network interfaces. In fact many traditional ISDN based MCUs now have IP interfaces. The differences in audio/video mixing will vary depending on the MCU manufacturer. I think that the b/w multiple problem you are referring actually applies only to Continuous Presence calls. CP can be implemented either synchronously or asynchrnously. In an asyncronous fashion, the MCU builds a composite image (lets say four images) and sends out the aggregate video flow so you end up with 4x the bandwidth at egress when compared with ingress. In an asynchrnous implementation, the composite is constructed by terminating each video call in the MCU and mixing is done (usually on a piece of h/w in the MCU) so the egress and ingress flows mach 1:1. Generally speaking, s/w based MCUs use async and h/w MCUs use sync. In any case, both options are available when doing video over IP

New Member

Re: IP mcu x ISDN mcu

Considering this feature, the Cisco MCU 3510 is considered asynchronous? and about the Cisco MCU 3540?

New Member

Re: IP mcu x ISDN mcu

Both the 3510 and 3540 implement CP asyncronously

New Member

Re: IP mcu x ISDN mcu

Another point to take into account. In tradional H.320 MCUs video and audio features are given dedicated hardware resources that are not part of the actual network resource. Although some H.323 MCU have hardware and software resources, youe average enterprise class MCU will be primarily software driven. Many of the software MCUs are licenced on a per endpoint agreement. For instance you have a 10 seat license for an MCU...this means up to 10 endpoints can connect to the MCU at anytime.

156
Views
0
Helpful
4
Replies
CreatePlease login to create content