REV. 1.2.1 Each channel (within the XRT59L921) will take each mark (which is provided to" />
參數(shù)資料
型號(hào)： XRT59L921IB
廠商： Exar Corporation
文件頁數(shù)： 13/32頁
文件大?。?/td> 0K
描述： IC LIU E1 21CH 316STBGA
標(biāo)準(zhǔn)包裝： 60
類型： 線路接口裝置（LIU）
驅(qū)動(dòng)器/接收器數(shù)： 21/21
規(guī)程： E1
電源電壓： 3.13 V ~ 3.46 V
安裝類型： 表面貼裝
封裝/外殼： 316-LBGA
供應(yīng)商設(shè)備封裝： 316-STBGA（21x21）
包裝： 托盤
XRT59L921
18
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
REV. 1.2.1
Each channel (within the XRT59L921) 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, presented in Figure 6, (when
measured on the secondary-side of the Transmit Output Transformer).
1.4
Interfacing the Transmit Sections of the XRT59L921 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 Figure 7 and Figure 8,
respectively.
FIGURE 6. ILLUSTRATION OF THE ITU-T G.703 PULSE TEMPLATE FOR E1 APPLICATIONS
10
%
10
%
10
%
10
%
10
%
10
%
269 ns
(244 + 25)
194 ns
(244 – 50)
244 ns
219 ns
(244 – 25)
488 ns
(244 + 244)
0%
50%
20
%
V = 100%
Nominal pulse
Note – V corresponds to the nominal peak value.
20
%
20
%
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