參數(shù)資料
型號(hào)： MT9173
廠商： Mitel Networks Corporation
英文描述： Digital Subscriber Interface Circuit with RxSB
中文描述： 數(shù)字用戶接口電路RxSB
文件頁(yè)數(shù)： 7/22頁(yè)
文件大小： 411K
代理商： MT9173
Preliminary Information
MT9173/74
9-143
In DIGITAL NETWORK (DN) mode, upon entering
the DNIC from the DV and CD ports, the B-channel
data, D-channel D0 (and D1 for 160 kbit/s), the HK
bit of the C-channel (160kbit/s only) and a SYNC bit
are combined in a serial format to be sent out on the
line by the Transmit Interface (Figures 11, 12). The
SYNC bit produces an alternating 1-0 pattern each
frame in order for the remote end to extract the frame
alignment from the line. It is possible for the remote
end to lock on to a data bit pattern which simulates
this alternating 1-0 pattern that is not the true SYNC.
To decrease the probability of this happening the
DNIC may be programmed to put the data through a
prescrambler that scrambles the data according to a
predetermined polynomial with respect to the SYNC
bit. This greatly decreases the probability that the
SYNC pattern can be reproduced by any data on the
line. In order for the echo canceller to function
correctly, a dedicated scrambler is used with a
scrambling algorithm which is different for the SLV
and MAS modes. These algorithms are calculated in
such a way as to provide orthogonality between the
near and far end data streams such that the
correlation between the two signals is very low.
For any two DNICs on a link, one must be in SLV
mode with the other in MAS mode. The scrambled
data is differentially encoded which serves to make
the data on the line polarity-independent. It is then
biphase encoded as shown in Figure 10. See “Line
Interface” section for more details on the encoding.
Before leaving the DNIC the differentially encoded
biphase data is passed through a pulse-shaping
bandpass transmit filter that filters out the high and
low frequency components and conditions the signal
for transmission on the line.
The composite transmit and receive signal is
received at L
IN
. On entering the DNIC this signal
passes through a Precanceller which is a summing
amplifier and lowpass filter that partially cancels the
near-end signal and provides first order antialiasing
for the received signal. Internal, partial cancellation
Figure 7 - CD Port (Modes 2,6)
Figure 8 - CD Port (Modes 1,5)
F0
C4
CDSTo
CDSTi
F0o
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
C
0
C
0
3.9
μ
sec
62.5
μ
sec
125
μ
sec
Channel Time 0
Channel Time 16
CLD
TCK
CDi
CDo
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
6
C
7
C
0
C
1
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
6
C
7
C
0
C
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT9173AE 制造商:Microsemi Corporation 功能描述:DGTL INTRFC CIRCUIT 24DIP - Rail/Tube 制造商:Microsemi Corporation 功能描述:IC SUBSCRIBER NETWRK DSIC 24PDIP
MT9173AE1 制造商:Microsemi Corporation 功能描述:DGTL INTRFC CIRCUIT 24DIP - Rail/Tube
MT9173AN 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Digital Subscriber Interface Circuit with RxSB
MT9173AN1 制造商:Microsemi Corporation 功能描述:PB FREE DNIC 1.5UM 制造商:Microsemi Corporation 功能描述:DGTL INTRFC CIRCUIT 24SSOP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SUBSCRIBER NETWRK DSIC 24SSOP 制造商:Microsemi Corporation 功能描述:IC SUBSCRIBER NETWRK DSIC 24SSOP
MT9173ANR1 制造商:Microsemi Corporation 功能描述:DGTL INTRFC CIRCUIT 24SSOP - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SUBSCRIBER NETWRK DSIC 24SSOP 制造商:Microsemi Corporation 功能描述:IC SUBSCRIBER NETWRK DSIC 24SSOP
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