參數(shù)資料
型號: XRT5997
廠商: Exar Corporation
英文描述: Seven-Channel E1 Line Interface Unit(7通道 E1線接口單元)
中文描述: 七通道E1線路接口單元(7通道素E1線接口單元)
文件頁數(shù): 22/37頁
文件大?。?/td> 367K
代理商: XRT5997
XRT5997
22
Rev. 1.0.0
0%
50%
V = 100%
244ns
Nominal Pulse
219ns
(244 - 25)
269ns
(244 + 25)
194ns
10%
10%
20%
Figure 4. Illustration of the ITU-T G.703 Pulse Template for E1 Applications
As a consequence, each channel (within the XRT5997
device) will take each mark (which is provided to it via
the “Transmit Input Interface” block, and will generate
a pulse that complies with the pulse template, pre-
sented in Figure 4, (when measured on the secondary-
side of the Transmit Output Transformer).
1.4
Interfacing the Transmit Sections of the
XRT5997 device to the Line
ITU-T G.703 specifies that the E1 line signal can be
transmitted over coaxial cable and terminated with 75
or transmitted over twisted-pair and terminated with
120
.
However, in both applications (e.g., 75
or 120
), the
user is advised to interface the Transmitter to the Line,
in the manner as depicted in Figures 5 and 6, respec-
tively.
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