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參數(shù)資料
| 型號： | MT9173AN1 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Digital Subscriber Interface Circuit with RxSB Digital Network Interface Circuit with RxSB |
| 中文描述： | DATACOM, DIGITAL SLIC, PDSO24 |
| 封裝： | 5.30 MM, LEAD FREE, MO-150AG, SSOP-24 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 613K |
| 代理商： | MT9173AN1 |
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MT9173/74
Data Sheet
5
Zarlink Semiconductor Inc.
and
144 kbit/s as required for the basic rate interface in ISDN. Full duplex transmission is made possible through
on board adaptive echo cancellation.
The DNIC has various modes of operation which are selected through the mode select pins MS0-2. The two major
modes of operation are the MODEM (MOD) and DIGITAL NETWORK (DN) modes. MOD mode is a transparent 80
or 160 kbit/s modem. In DN mode the line carries the B and D channels formatted for the ISDN at either 80 or
160 kbit/s. In the DN mode the DV and CD ports are standard ST-BUS and in MOD mode they are transparent
serial data streams at 80 or 160 kbit/s. Other modes include: MASTER (MAS) or SLAVE (SLV) mode, where the
timebase and frame synchronization are provided externally or are extracted from the line and DUAL or SINGLE
(SINGL) port modes, where both the DV and CD ports are active or where the CD port is inactive and all
information is passed through the DV port. For a detailed description of the modes
see “Operating Modes” section.
In DIGITAL NETWORK (DN) mode there are three channels transferred by the DV and CD ports. They are the B, C
and D channels. The B1 and B2 channels each have a bandwidth of 64 kbit/s and are used for carrying PCM
encoded voice or data. These channels are always transmitted and received through the DV port (Figures 3, 4, 5,
6). The C-channel, having a bandwidth of 64 kbit/s, provides a means for the system to control the DNIC and for the
DNIC to pass status information back to the system. The C-channel has a Housekeeping (HK) bit which is the only
bit of the C-channel transmitted and received on the line. The 2B+D channel bits and the HK bit are double-
buffered. The D-channel can be transmitted or received on the line with either an 8, 16 or 64 kbit/s bandwidth
depending on the DNIC’s mode of operation. Both the HK bit and the D-channel can be used for end-to-end
signalling or low speed data transfer. In DUAL port mode the C and D channels are accessed via the CD port
(Figure 7) while in SINGL port mode they are transferred through the DV port (Figures 5, 6) along with the B1 and
B2 channels.
Figure 5 - DV Port - 80 kbit/s (Modes 0,4)
Figure 6 - DV Port - 160 kbit/s (Modes 0,4)
Channel Time 0
D-Channel
Channel Time 1
C-Channel
Channel Time 2
B1-Channel
11.7
μ
sec
F0
C4
DSTo
DSTi
F0o
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
1
C
2
C
3
C
4
C
5
C
6
C
7
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
D
0
D
0
Channel Time 0
D-Channel
Channel Time 1
C-Channel
Channel Time 2
B1-Channel
15.6
μ
sec
F0
C4
DSTo
DSTi
F0o
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
1
C
2
C
3
C
4
C
5
C
6
C
7
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
D
0
D
0
Channel Time 3
B2-Channel
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
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