參數(shù)資料
型號(hào)： MT90812
廠商： Mitel Networks Corporation
英文描述： Integrated Digital Switch (IDX)(集成數(shù)字開(kāi)關(guān))
中文描述： 綜合數(shù)字交換機(jī)（IDX的）（集成數(shù)字開(kāi)關(guān)）
文件頁(yè)數(shù)： 24/105頁(yè)
文件大?。?/td> 334K
代理商： MT90812
MT90812
Advance Information
20
Figure 15 - Conference Control with Conference Party Control Registers and Connect Memory
6.1
Channel Attenuation
Channel Attenuation is provided on incoming and outgoing channels that are in a conference. The gain can
range from +3 to -27 dB in steps of 1dB, as well as -
dB for the incoming PCM data and +0 to -9 dB in steps of
3dB for outgoing PCM data. If an overflow condition occurs, then the input from each channel in a conference
can be independently attenuated, by setting the incoming channel attenuation bits in CMH for the specific
conference party. The outgoing gain bits are in the Conference Party Control register.
6.2
Noise Suppression and Channel Inversion
Channel inversion and noise suppression bits are specified in Connect Memory High for locations 60-6E
H
.
When noise suppression is enabled for a specific input channel, then the PCM bytes for this channel, when
below the selected threshold level, are converted to PCM bytes corresponding to the minimum PCM code level
before being added to the conference sum. The four threshold levels available correspond to the first, fifth,
ninth, and sixteenth step of the first segment. These are 1/4096, 9/4096, 16/4096, and 32/4096 with respect to
full scale A-law, and 1/8159, 9/8159, 16/8159, and 32/8159 with respect to full scale ulaw. The threshold level
is set using the threshold bits NS1, NS0.
The inversion bit allows for every other channel in a conference to be inverted. This reduces noise due to
reflections and line impedance mismatch.
6.3
Tone Insertion
As a party is added to a conference, if the insertion tone bit (IT) is set, all channels connected in a conference
will have the tone added to the conference output. This allows for conference users to be informed of a new
party being added to the conference, or to be reminded that they are in a conference.
The DM address of the desired tone must be programmed at location 6F
H
of CML, (16F
H
non-mux mode, EF
H
for mux-mode addressing). The tone source may be from any location in DM, including any of the 32 tones
from the Tone Generation block. The PCM data from the specified Data Memory location will be added to the
conference output for a specified tone duration.
The tone duration is specified in the Conference Control Register (CC). Refer to Section 22.10 for a description
of the Conference Control Register (CC). The tone duration can be set from 0.125 to 1.0 seconds in steps of
0.125 seconds. The tone duration is from the time the party is added to the conference by writing the
Conference Party Control Register.
CID,ST,IT,GCout
Data Memory
Connect Memory
60-6E
H*
Control Registers
Parallel to Serial
Output Stream
GCin,Inv,NS
30-3E
HEX
Low
Incoming Channel
High
Conference Output
60-6E
H*
6F
H
*in Non-mux micro-port mode the addresses for DM,CML and CMH are 060-06E, 160-16E and
260-26E respectively and the control registers addresses are 3B0-3BE. For mux-mode the addresses
DM,CML and CMH are E0-EE and the control registers addresses are 30-3E with the appropriate
page selected in the AMS register.
Incoming Data
Incoming Channel
Insertion Tone
Gain
Conf Party Control
∞
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