MT90812
1.0
2.0
3.0
Functional Description.................................................................................................... 7
Local TDM Streams ......................................................................................................... 8
Expansion Bus................................................................................................................. 8
3.1
3.2
TDM Link Mode ........................................................................................................................................8
IDX Link Mode..........................................................................................................................................9
4.0
Switching........................................................................................................................ 10
4.1
Switching Functions ...............................................................................................................................10
Data Transfer from Local TDM Streams to Data Memory .............................................................. 10
Data Transfer from the Expansion Bus to Data Memory................................................................ 10
Connect Memory and Data Memory Structure ............................................................................... 10
Switching Output Data from Either Data Memory or Connect Memory .......................................... 10
Connection Memory Usage for Switch Connection or Message Mode .......................................... 11
Connection Memory Select ............................................................................................................ 11
Connect Memory Configurations for Expansion Bus Modes .......................................................... 11
4.1.1
4.1.2
4.1.3
4.1.4
4.2
4.2.1
4.2.2
4.2.3
Connection Memory ...............................................................................................................................10
5.0
Address Memory Map ................................................................................................... 12
5.1
Memory Page Select ..............................................................................................................................12
Addressing Memory Pages in Multiplexed Microport Mode ........................................................... 12
Addressing Memory Pages in Non-Multiplexed Microport Mode.................................................... 12
Local Data Memory ........................................................................................................................ 13
5.1.1
5.1.2
5.2
5.3
5.4
5.2.1
Data Memory and Connect Memory ......................................................................................................13
Connection Memory use in Conferencing, Gain Control and specifying Incoming Sources for .............14
Use of Data Memory Reserved for Expansion Bus Streams .................................................................15
6.0
Conferencing ................................................................................................................. 18
6.1
6.2
6.3
6.4
6.5
6.6
Channel Attenuation...............................................................................................................................20
Noise Suppression and Channel Inversion ............................................................................................20
Tone Insertion ........................................................................................................................................20
Conference Overflow..............................................................................................................................21
Starting a New Conference ....................................................................................................................21
Removing a channel from a Conference................................................................................................21
7.0
8.0
Gain Control ................................................................................................................... 22
Delays Through the MT90812 ....................................................................................... 22
8.1
8.2
8.3
Minimum Delay Mode (CST bit=0) .........................................................................................................22
Constant Delay Mode (CST bit=1) .........................................................................................................24
Delays in Conferencing ..........................................................................................................................24
vii
MITEL [ MITEL NETWORKS CORPORATION ]
