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XRT7250 Datasheet(PDF) 229 Page - Exar Corporation

Part # XRT7250
Description  DS3/E3 FRAMER IC
PDF  463 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7250 Datasheet(HTML) 229 Page - Exar Corporation

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XRT7250
DS3/E3 FRAMER IC
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REV. 1.1.1
210
Method 2 - Using RxOutClk and the RxOHEnable
signals
Method 1 requires that the Terminal Equipment be
able to handle an additional clock signal, RxOHClk.
However, there may be a situation in which the Termi-
nal Equipment circuitry does not have the means to
accommodate and process this extra clock signal, in
order to use the Receive Overhead Data Output Inter-
face. Hence, Method 2 is available. Method 2 in-
volves the use of the following signals.
• RxOH
• RxOutClk
• RxOHEnable
• RxOHFrame
Each of these signals are listed and described below
in Table 43.
FIGURE 89. ILLUSTRATION OF THE SIGNALS THAT ARE OUTPUT VIA THE RECEIVE OVERHEAD OUTPUT INTERFACE
(FOR METHOD 1).
RxOHClk
RxOHFrame
RxOH
X
F1
AIC
F0
FEAC
Terminal Equipment should sample
the “RxOHFrame” and “RxOH” signals
here.
Recommended Sampling Edges



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