参数资料
型号: XRT73L04BIV
厂商: Exar Corporation
文件页数: 26/64页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 4CH 144LQFP
标准包装: 60
类型: 线路接口装置(LIU)
驱动器/接收器数: 4/4
规程: DS3,E3,STS-1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
XRT73L04B
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
28
2.0
THE TRANSMIT SECTION
Figure 13 indicates that the Transmit Section within
each Channel of the XRT73L04B consists of the fol-
lowing blocks:
Transmit Logic Block
TxClk_(n) Duty Cycle Adjust Block
HDB3/(B3ZS) Encoder
Pulse Shaping Block
The purpose of the Transmit Section is to take TTL/
CMOS level data from the terminal equipment and
encode it into a format such that it can:
1. Be efficiently transmitted over coaxial cable at
E3, DS3, or STS-1 data rates.
2. Be reliably received by the Remote Terminal
Equipment 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 (e.g., a binary data
stream) TTL/CMOS level data and timing information
from the Terminal Equipment.
2.1.1
Accepting Dual-Rail Data from the Termi-
nal Equipment
Whenever the XRT73L04B accepts Dual-Rail data
from the Terminal Equipment, it does so via the fol-
lowing input signals:
TPData_(n)
TNData_(n)
TxClk_(n)
Figure 14 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
XRT73L04B.
The manner that the LIU handles Dual-Rail data is
described below and illustrated in Figure 15. The
Transmit Section (of a Channel) typically samples the
data on the TPData_(n) and TNData_(n) input pins
on the falling edge of TxClk_(n).
FIGURE 14. THE TYPICAL INTERFACE FOR THE TRANSMISSION OF DATA IN A DUAL-RAIL FOR-
MAT FROM THE
TRANSMITTING TERMINAL EQUIPMENT TO THE TRANSMIT SECTION OF A CHANNEL
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
Exar E3/DS3/STS-1 LIU
Transmit
Logic
Block
TxPOS
TxNEG
TxLineClk
TPData
TNData
TxClk
FIGURE 15. THE XRT73L04B SAMPLES THE DATA ON THE TPDATA AND TNDATA INPUT PINS
TxClk
TPData
TNData
Data
1
0
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