Difference between revisions of "Duplex Conference 10.45"
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DSP SW (from version 01.14) implements 32 conference ports. (Resource type 0x1300) Each conference port can be connected to one of 32 "summation points". Each conference port outputs the sum of the inputs from the other ports connected to the same summation point. | DSP SW (from version 01.14) implements 32 conference ports. (Resource type 0x1300) Each conference port can be connected to one of 32 "summation points". Each conference port outputs the sum of the inputs from the other ports connected to the same summation point. | ||
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| + | So there can never be more than 32 simultaneous participants in total in an exchange. (This matches the capacity for 2 AGA cards only used for conference mixing) | ||
Each local participant uses at least one Conference port and and one AMC-backplane (PCMC) channel. There are 32 PCMC channels, and the same channels also used for every VoIP connection, like AlphaNet, IP stations, Inter-module-over-IP. | Each local participant uses at least one Conference port and and one AMC-backplane (PCMC) channel. There are 32 PCMC channels, and the same channels also used for every VoIP connection, like AlphaNet, IP stations, Inter-module-over-IP. | ||
Revision as of 12:56, 18 April 2008
| This AlphaCom feature is under development and is not yet released! |
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The duplex conference feature is currently being upgraded in the AMC SW. The revised Duplex Conference will be released soon, in some version 10.45. See Duplex Conference for description of the existing version. The remaining text describes the difference from the old version. This text will eventually be merged into the main article.
Contents
Whats new
Mixing in DSP
The new duplex conference do the mixing in the DSP of the AMC-IP board. No AGA board is required, neither any AlphaPro configuration.
This means that the conference audio is limited to 7kHz bandwidth, also for internal members.
As before: only the master module is used for mixing.
IP calls supported
Calling into Duplex Conference is now properly supported.
- Calling from stations wired to slave modules linked with IP audio now works.
- Use of line echo cancelling versus voice switched duplex is greatly improved. This makes calling from IP stations and AlphaNet more useable.
An important change is local ASLT/ATLB stations use a Line Echo Cancellation (LEC) resource when going off hook. This is required so that members connecting via IP do not receive annoying echo. An other positive effect of using LEC is that it reduces the risk of "howling" when having large number of offhook members in a conference.
Up to 16 members in a duplex conference
The max number is now 16 (up from 4). It remains to be tested whether this is actually useable, in terms of audio quality. There are also a number of resource constraints that can limit the number of participants, see next section.
Resource usage and limitations
DSP SW (from version 01.14) implements 32 conference ports. (Resource type 0x1300) Each conference port can be connected to one of 32 "summation points". Each conference port outputs the sum of the inputs from the other ports connected to the same summation point.
So there can never be more than 32 simultaneous participants in total in an exchange. (This matches the capacity for 2 AGA cards only used for conference mixing)
Each local participant uses at least one Conference port and and one AMC-backplane (PCMC) channel. There are 32 PCMC channels, and the same channels also used for every VoIP connection, like AlphaNet, IP stations, Inter-module-over-IP.
A ASLT participant with handset on will use Voice switched Duplex, requiring ASLT scanners.
A ASLT participant with handset off require a LEC resource. If the participant is wired to a IP-slave, the LEC resource is located to the slave module. If LEC resources are used up, the connection switches back to Voice switched Duplex.
An IP station participant does not require duplex-scanner or LEC in the exchange, because the IP station has built in echo cancelling.
Calling into a conference over AlphaNet IP: When offhook, the voice switched duplex usually takes place in the conference exchange. But when going offhook, the LEC resource is taken from the remote calling exchange.
Conversation timeout
The Conversation timeout is now active on duplex conference members, in exactly same way as in a normal conversation. Each member starts its own timer when joining the conference, so each member is disconnected individually when her time is out.