Datasheet > MT8972B

MT8972B

更新时间： 2024-01-11 22:23:38

品牌	Logo	应用领域
MITEL		网络接口
页数	文件大小	规格书
20页	393K
描述
ISO2-CMOS ST-BUS⑩ FAMILY Digital Subscriber Interface Circuit Digital Network Interface Circuit

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中文翻译

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技术参数
数据手册

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MT8972B 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	QFP	包装说明：	QCCJ, LDCC28,.5SQ
针数：	28	Reach Compliance Code：	unknown
HTS代码：	8542.39.00.01	风险等级：	5.81
Is Samacsys：	N	数据速率：	160 Mbps
ISDN访问速率：	BASIC	JESD-30 代码：	S-PQCC-J28
JESD-609代码：	e0	长度：	11.5062 mm
功能数量：	1	端子数量：	28
最高工作温度：	85 °C	最低工作温度：	-40 °C
最小输出高电压：	2.4 V	最大输出低电流：	0.005 A
最大输出低电压：	0.4 V	封装主体材料：	PLASTIC/EPOXY
封装代码：	QCCJ	封装等效代码：	LDCC28,.5SQ
封装形状：	SQUARE	封装形式：	FLATPACK, THIN PROFILE, FINE PITCH
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	5 V
认证状态：	Not Qualified	参照点：	S
座面最大高度：	4.57 mm	子类别：	Digital Transmission Interfaces
最大压摆率：	15 mA	标称供电电压：	5 V
表面贴装：	YES	技术：	CMOS
电信集成电路类型：	DIGITAL SLIC	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	J BEND
端子节距：	1.27 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	11.5062 mm
Base Number Matches：	1

MT8972B 数据手册

MT8971B/72B

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

of the near end signal may be disabled by holding

C₀C₁C₂C₃C₄C₅C₆C₇

D₀D₁D₂D₃D₄D₅D₆D₇

C₀

CDSTo

C₀C₁C₂C₃C₄C₅C₆C₇

D₀D₁D₂D₃D₄D₅D₆D₇

CDSTi

F0o

3.9 µsec

62.5 µsec

125 µsec

Channel Time 0

Channel Time 16

Figure 7 - CD Port (Modes 2,6)

CLD

TCK

CDi

C₆

C₇

C₀

C₁

C₂

C₃

C₄

C₅

C₆

C₇

C₀

C₁

CDo

Figure 8 - CD Port (Modes 1,5)

9-112

1...3 4 567 8 9...20

中文翻译

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与MT8972B相关器件

型号	品牌	获取价格	描述	数据表
MT8972BC	MITEL	获取价格	ISO2-CMOS ST-BUS⑩ FAMILY Digital Subscriber I
MT8972BE	MITEL	获取价格	ISO2-CMOS ST-BUS⑩ FAMILY Digital Subscriber I
MT8972BP	MITEL	获取价格	ISO2-CMOS ST-BUS⑩ FAMILY Digital Subscriber I
MT8976	MITEL	获取价格	ISO-CMOS ST-BUS⑩ FAMILY T1/ESF Framer Circuit
MT8976AC	MITEL	获取价格	ISO-CMOS ST-BUS⑩ FAMILY T1/ESF Framer Circuit
MT8976AE	MITEL	获取价格	ISO-CMOS ST-BUS⑩ FAMILY T1/ESF Framer Circuit
MT8976AE1	ROCHESTER	获取价格	DATACOM, FRAMER, PDIP28, LEAD FREE, PLASTIC, MS-011AB, DIP-28
MT8976AE1	MICROSEMI	获取价格	DATACOM, FRAMER, PDIP28, LEAD FREE, PLASTIC, MS-011AB, DIP-28
MT8976AP	MITEL	获取价格	ISO-CMOS ST-BUS⑩ FAMILY T1/ESF Framer Circuit
MT8976AP1	MICROSEMI	获取价格	Framer, PQCC44, LEAD FREE, PLASTIC, MS-018AC, LCC-44

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