MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 22

• Manufacturer Part Number: MT90812
• Description: Integrated Digital Switch (IDX)
• Manufacturer: Mitel Networks Corporation

MT90812
timeslots, where IDX A can either write to EST0 and EST1 during these channels or place EST0 or EST1 in
high impedance.
6.0
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.
18
Conferencing
Expansion Bus
A6-A0
Figure 12 - Data Memory Assignment for Expansion Bus Timeslots for EP1,EP0 = 00
Data Memory
Hex
00
01
1F
20
21
3F
40
41
5F
60
61
7F
-
-
-
-
EA1
EA2
-
EA32
EB1
EB2
-
EB32
EC1
EC2
-
EC32
ED1
ED2
-
ED32
DM
FP
EST0
EST1
.
A1
A1
B1
B1
C1
C1
D1
D1
A2
A2
B2
B2
C2
C2
D2
D2
Connect Memory
Advance Information
Expansion Bus
A6-A0
Hex
1F
3F
5F
7F
00
01
20
21
40
41
60
61
-
-
-
-
EA1
EA2
-
EA32
EB1
EB2
-
EB32
EC1
EC2
-
EC32
ED1
ED2
-
ED32
CM
.