參數(shù)資料
型號: XRT59L921IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA316
封裝: 21 X 21 MM, STBGA-316
文件頁數(shù): 20/32頁
文件大小: 377K
代理商: XRT59L921IB
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.
F
IGURE
6. I
LLUSTRATION
OF
THE
ITU-T G.703 P
ULSE
T
EMPLATE
FOR
E1 A
PPLICATIONS
1
1
1
1
1
1
269 ns
(244 + 25)
194 ns
(244 – 50)
244 ns
219 ns
(244 – 25)
488 ns
(244 + 244)
0%
50%
2
V = 100%
Nominal pulse
Note
– V corresponds to the nominal peak value.
2
2
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