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• Network quality of service (QoS)
• When equipped with the optional audio transcoder card, the MCU provides:
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Transcoding between audio encoding methods for video- and audio-only conferences
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Wideband audio mixing, offering high-quality audio when using endpoints that support G.722 encoding
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Compatibility with endpoints and IP telephones supporting any one of the audio codecs
• When combined with the optional Cisco IP/VC 3540 Series Rate Matching Module, the system provides:
–
Videoconferences with participants connected at 128-kbps and 384-kbps
–
Continuous presence videoconferences with symmetric bandwidth (384-kbps into and 384-kbps out of
the MCU)
The Cisco IP/VC 3540 Series MCU modules are available in three capacities to fit any need or budget. The largest
supports 100 participants in one or more conferences at 128 kbps. (This same module can support 70 participants
at 384 kbps, or 25 at 768 kbps. See Tables 4 and 5 in the specifications sections at end of this document.) Two other
models support 60 participants at 128 kbps or 30 participants at 128 kbps.
Up to four modules may be installed in a chassis, providing significant scalability, even for high-bandwidth,
high-quality videoconferences.
The Cisco IP/VC 3540 Series Rate Matching Module
The Cisco IP/VC 3540 Series Rate Matching Module is an option to the Cisco IP/VC 3540 Series MCUs that provides
flexibility for managing the bandwidth of a videoconference. It is a video processing engine that alters the encoding
of the video stream to match the capabilities of a particular endpoint or to accommodate an IP WAN connection
between two locations.
The Rate Matching Module, together with the MCU, performs two functions:
• It supports mixed-rate conferences when endpoint capabilities require a conference to support participants at two
different rates
• It supports symmetric conference rates for continuous presence conferences
The mixed-rate capability allows a 384-kbps meeting to include one or more participants at 128-kbps. This is
common when a H.320 endpoint with a single ISDN BRI connection needs to join a conference through a gateway.
With the Rate Matching Module, the slower endpoint will connect to the videoconference at its lower rate, while all
the other parties maintain the higher speed. This ensures the best video quality for all participants in the conference.
For continuous presence conferences, the Rate Matching Module processes the four-way video image so that the data
rate is symmetrical—the same bandwidth out of the MCU as into it. The symmetric conference rate makes it possible
to have business-quality continuous presence conferences over a IP WAN connection or to include ISDN-based
H.320 endpoints in a videoconference with continuous presence.
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