TX_SONETCLK
TX_FRAME_SFP
TX_E1E2F1_CLK
TX_E1_DATA
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| B4 | B5 | B6 | B7 | B8 |
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| E1, F1, E2 |
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APPROX. 750 ns
TX_FRAME_SFP
TX_E1E2F1_CLK
Figure 43. Transmit Overhead Clock and Data Alignment
The transmit overhead clock and data alignment timing diagram (Figure 43) shows the relationship between the TX_E1_DATA, TX_E2_DATA and TX_F1_DATA serial data inputs and their associated clock TX_E1E2F1_CLK. It is a 72 kHz 50% duty cycle clock that is gapped to produce a 64 kHz nominal rate and is aligned as shown.