ATM Statistics

These are counters for interfaces supported by the ATM module.

ATM Adaptation Layers - AAL, the ATM protocol stack with AAL5 being the upper layer. This low overhead AAL packages higher layer information into the 53-byte ATM cell. This information can be any combination of:


AAL5 PDUs transmitted
The number of PDU packets transmitted.

AAL5 PDUs received
The number of PDU packets received.

AAL5 PDUs total
The total number of PDU packets.

AAL5 error: CS Layer errors
The number of convegence sublayer errors

AAL5 error: PDU CRC errors
The number of PDU CRC errors

Cell error: no VCI connection
The number of Virtual Channel Identifiers with no connection. This means there is no mapping entry listed for them.

PMD statistic: section BIP
The number of Section BIP-8 (Bit Inter-leaved Parity) errors that have been detected. The calculated BIP-8 code extracted from the B1 byte of the following frame. Differences indicate that a section level bit error has occurred.

PMD statistic: path BIP
The number of Path BIP-8 (Bit Inter-leaved Parity) errors that have been detected. A path BIP-8 error is detected by comparing the path BIP-8 byte (B3) extracted from the current frame, to the BIP-8 computed for the previous frame.

PMD statistic: line BIP
The number of Line BIP-24 (Bit Inter-leaved Parity) errors that have been detected. The calculated BIP-24 code is based on the line overhead and synchronous payload envelope (SPE) of the STS-3c stream. The line BIP-24 code is a bit interleaved party calculation using even parity. The calculated code is compared with the BIP-24 code extracted from the B2 bytes of the following frame. Differences indicate that a line layer bit error has occurred.

PMD statistic: path FEBE
The number of path Far End Block Error (FEBE) that have been detected. FEBEs are detected by extracting the 4-bit FEBE field from the path status byte (G1). The valid range for the 4-bit field is between 0000 and 1000, representing zero and eight errors. Other values are interpreted as zero errors.

PMD statistic: line FEBE
The number of line Far End Block Error (FEBE) that have been detected.

PMD statistic: corrected HCS
The number of Header Check Sequence (HCS) error events that occurred. The HCS is a CRC-8 calculation over the first 4 octets of the ATM cell header.

PMD statistic: uncorrected HCS
The number of uncorrectable Header Check Sequence (HCS) error events that occurred. The HCS is a CRC-8 calculation over the first 4 octets of the ATM cell header.


Procedures

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