MT90812 查看數據表（PDF） - Mitel Networks

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MT90812

Integrated Digital Switch (IDX)

Mitel Networks 

MT90812

1.0 Functional Description.................................................................................................... 7

2.0 Local TDM Streams ......................................................................................................... 8

3.0 Expansion Bus................................................................................................................. 8

3.1 TDM Link Mode ........................................................................................................................................8

3.2 IDX Link Mode..........................................................................................................................................9

4.0 Switching........................................................................................................................ 10

4.1 Switching Functions ...............................................................................................................................10

4.1.1 Data Transfer from Local TDM Streams to Data Memory .............................................................. 10

4.1.2 Data Transfer from the Expansion Bus to Data Memory................................................................ 10

4.1.3 Connect Memory and Data Memory Structure ............................................................................... 10

4.1.4 Switching Output Data from Either Data Memory or Connect Memory .......................................... 10

4.2 Connection Memory ...............................................................................................................................10

4.2.1 Connection Memory Usage for Switch Connection or Message Mode .......................................... 11

4.2.2 Connection Memory Select ............................................................................................................ 11

4.2.3 Connect Memory Configurations for Expansion Bus Modes .......................................................... 11

5.0 Address Memory Map ................................................................................................... 12

5.1 Memory Page Select ..............................................................................................................................12

5.1.1 Addressing Memory Pages in Multiplexed Microport Mode ........................................................... 12

5.1.2 Addressing Memory Pages in Non-Multiplexed Microport Mode.................................................... 12

5.2 Data Memory and Connect Memory ......................................................................................................13

5.2.1 Local Data Memory ........................................................................................................................ 13

5.3 Connection Memory use in Conferencing, Gain Control and specifying Incoming Sources for .............14

5.4 Use of Data Memory Reserved for Expansion Bus Streams .................................................................15

6.0 Conferencing ................................................................................................................. 18

6.1 Channel Attenuation...............................................................................................................................20

6.2 Noise Suppression and Channel Inversion ............................................................................................20

6.3 Tone Insertion ........................................................................................................................................20

6.4 Conference Overflow..............................................................................................................................21

6.5 Starting a New Conference ....................................................................................................................21

6.6 Removing a channel from a Conference................................................................................................21

7.0 Gain Control ................................................................................................................... 22

8.0 Delays Through the MT90812 ....................................................................................... 22

8.1 Minimum Delay Mode (CST bit=0) .........................................................................................................22

8.2 Constant Delay Mode (CST bit=1) .........................................................................................................24

8.3 Delays in Conferencing ..........................................................................................................................24

vii

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