參數(shù)資料
型號: XRT81L27
廠商: Exar Corporation
英文描述: Seven Channel E1 Line Interface Unit with Clock Recovery(7通道 E1線接口單元(帶時鐘恢復))
中文描述: 七通道E1線路接口單元的時鐘恢復(7通道素E1線接口單元(帶時鐘恢復))
文件頁數(shù): 22/28頁
文件大?。?/td> 140K
代理商: XRT81L27
XRT81L27
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
REV. P1.0.1
PRELIMINARY
22
1.0
The purpose of the "Transmit Pulse Shaping" Circuit
is to generate Transmit Output pulses that comply
with the ITU-T G.703 Pulse Template Requirements
for E1 applications, even with TClk duty cycle be-
tween 30 and 70%.
As a consequence, each channel (within the
XRT81L27 device) will take each mark (which is pro-
vided to it via the Transmit Input Interface block, and
will generate a pulse that complies with the pulse
THE PULSE SHAPING CIRCUIT
template, presented in Figure 6, (when measured on
the secondary-side of the Transmit Output Transform-
er).
1.1
I
NTERFACING
THE
T
RANSMIT
S
ECTIONS
OF
THE
XRT81L27
TO
THE
L
INE
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 7 and 8,
respectively.
F
IGURE
7. I
LLUSTRATION
OF
THE
ITU-T G.703 P
ULSE
T
EMPLATE
FOR
E1 A
PPLICATIONS
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