xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 393

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
2.3.3
The purpose of the Receive SONET POH Processor block is to accomplish the following.
• To receive an STS-1 SPE from the Receive STS-3 TOH Processor block
• To acquire and maintain the location of the STS-1 SPE, within the incoming STS-1 data-stream
• To compute and verify the B3 bytes and increment performance monitor registers anytime it detects B3
byte errors.
• To declare and clear the following defect conditions.
• To increment performance monitor registers anytime it detects an REI-P event.
• To receive either 1-byte, 16-byte or 64-byte Path Trace Identification Messages via the J1 byte within each
incoming STS-1 SPE; and to detect and declare the TIM-P defect condition when appropriate.
Figure 92 presents an illustration of the Functional Block Diagram of the XRT94L33 Mapper IC; with the
“Receive SONET POH Processor” block highlighted.
RECEIVE SONET POH PROCESSOR BLOCK
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LOP-P (Loss of Pointer)
AIS-P (Path AIS)
RDI-P (Path – Remote Defect Indicator)
PLM-P (Path – Payload Label Mismatch)
UNEQ-P (Path – Unequipped)
TIM-P (Path – Trace Identification Mismatch)
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XRT94L33
Rev.1.2.0.