MT90812AP datasheet(22/105 Pages) MITEL

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MT90812

Advance Information

timeslots, where IDX A can either write to EST0 and EST1 during these channels or place EST0 or EST1 in

high impedance.

Figure 12 - Data Memory Assignment for Expansion Bus Timeslots for EP1,EP0 = 00

6.0

Conferencing

The conference block provides conference call capability in the MT90812 and supports a total of 15 parties,

distributed over a maximum of 5 conferences. (i.e. 1x15 parties, 3x5 parties, 5x3 parties etc.). A/m-Law

companded data from an incoming channel is converted to linear format, applied incoming gain, processed by

a dedicated arithmetic unit, applied outgoing conference gain and stored in Data Memory in linear format. The

output signal contains all the information of each channel connected in conference except its own.

For each of the 15 conference parties there is a Conference Party Control Register. The Conference Party

Control Register contains the conference ID, start bit, insertion tone enable and outgoing channel attenuation.

Refer to “Conference Party Control Register (CPC1-15)” on page 65.

The output for each conference is stored in 1 of 15 Data Memory locations which can be switched to any

outgoing channel. For each of the 15 DM locations the corresponding Connect Memory Low byte is used to

specify the incoming source channel.

The conference circuit incoming channels are speciﬁed in CML 60-6E. The incoming conference gain,

inversion bit and noise suppression are speciﬁed in CMH. Message mode, Minimum or Constant Delay and

Output Enable are not used for locations 60-6E reserved for conference control. See the description of

“Connection Memory High” on page 50. Channels are transferred from Data Memory with Constant Delay to

the conference circuit.

Expansion Bus

Data Memory

Hex

A6-A0

EA1

EA2

EA32

EB1

EB2

EB32

EC1

EC2

EC32

ED1

ED2

ED32

EST0

EST1

Expansion Bus

Connect Memory

Hex

A6-A0

EA1

EA2

EA32

EB1

EB2

EB32

EC1

EC2

EC32

ED1

ED2

ED32

MT90812AP Datasheet(PDF) 22 Page - Mitel Networks Corporation

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