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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XRT75VL00D датащи(PDF) 57 Page - Exar Corporation |
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XRT75VL00D датащи(HTML) 57 Page - Exar Corporation |
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57 / 92 page  XRT75VL00D REV. 1.0.3 E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER 52 In general, the role/purpose of the TOH bytes is to fulfill the following functions. • To support STS-1 Frame Synchronization • To support Error Detection within the STS-1 frame • To support the transmission of various alarm conditions such as RDI-L (Line - Remote Defect Indicator) and REI-L (Line - Remote Error Indicator) • To support the Transmission and Reception of "Section Trace" Messages • To support the Transmission and Reception of OAM&P Messages via the DCC Bytes (Data Communication Channel bytes - D1 through D12 byte) The roles of most of the TOH bytes is beyond the scope of this Data Sheet and will not be discussed any further. However, there are a three TOH bytes that are important from the stand-point of this data sheet, and will discussed in considerable detail throughout this document. These are the H1 and H2 (e.g., the SPE Pointer) bytes and the H3 (e.g., the Pointer Action) byte. Figure 34 presents an illustration of the Byte-Format of the TOH within an STS-1 Frame, with the H1, H2 and H3 bytes highlighted. FIGURE 33. THE BYTE-FORMAT OF THE TOH WITHIN AN STS-1 FRAME A1 A1 B1 B1 D1 D1 H1 H1 B2 B2 D4 D4 S1 S1 D10 D10 D7 D7 C1 C1 F1 F1 D3 D3 H3 H3 K2 K2 D6 D6 E2 E2 D12 D12 D9 D9 A2 A2 E1 E1 D2 D2 H2 H2 K1 K1 D5 D5 M0 M0 D11 D11 D8 D8 Envelope Capacity Bytes Envelope Capacity Bytes 3 Byte Columns 87 Byte Columns 9 Rows The TOH Bytes |
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