参数资料
型号: XRT7300IVTR
厂商: Exar Corporation
文件页数: 17/55页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 SGL 44TQFP
标准包装: 1,000
类型: 线路接口装置(LIU)
驱动器/接收器数: 1/1
规程: DS3,E3,STS-1
电源电压: 4.75 V ~ 5.25 V
安装类型: 表面贴装
封装/外壳: 44-LQFP
供应商设备封装: 44-TQFP(10x10)
包装: 带卷 (TR)
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
20
shape and width to meet the applicable pulse
template requirement.
5. The LOS Declaration/Clearance Criteria is estab-
lished.
2.0
THE TRANSMIT SECTION
Figure 1 indicates that the Transmit Section of the
XRT7300 consists of the following blocks:
Transmit Logic Block
Duty Cycle Adjust Block
HDB3/B3ZS Encoder
Pulse Shaping Block
The purpose of the Transmit Section in the XRT7300
is to take TTL/CMOS level data from the terminal
equipment and encode it into a format that can:
1. be efficiently transmitted over coaxial cable at E3,
DS3 or STS-1 data rates.
2. be reliably received by the Remote Terminal at
the other end of the E3, DS3 or STS-1 data link.
3. comply with the applicable pulse template
requirements.
2.1
THE TRANSMIT LOGIC BLOCK
The purpose of the Transmit Logic Block is to accept
either Dual-Rail or Single-Rail (a binary data stream)
TTL/CMOS level data and timing information from the
Terminal Equipment.
Accepting Dual-Rail Data from the Terminal
Equipment
The XRT7300 accepts Dual-Rail data from the Termi-
nal Equipment via the following input signals:
TPDATA
TNDATA
TCLK
Figure 10 illustrates the typical interface for the trans-
mission of data in a Dual-Rail Format between the
Terminal Equipment and the Transmit Section of the
XRT7300.
FIGURE 10. THE TYPICAL INTERFACE FOR THE TRANSMISSION OF DATA IN A DUAL-RAIL FORMAT FROM THE TRANS-
MITTING
TERMINAL EQUIPMENT TO THE TRANSMIT SECTION OF THE XRT7300
Exar E3/DS3/STS-1 LIU
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
TxPOS
TxNEG
TxLineClk
Transmit
Logic
Block
Transmit
Logic
Block
TPDATA
TNDATA
TCLK
FIGURE 11. HOW THE XRT7300 SAMPLES THE DATA ON THE TPDATA AND TNDATA INPUT PINS
TCLK
TPDATA
TNDATA
Data
1
0
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