SNDCP Data Statistics:

Un-Acknowledged mode:

SN-PDUs received

Description: This proprietary counter indicates the total number of SN-PDUs received by SNDCP.

Triggers: Increments when an SN-PDU is received by SNDCP.

Availability: per SGSN service

SN-PDU Bytes received

Description: This proprietary counter indicates the total number of SN-PDU bytes received by SNDCP.

Triggers: Increments when an SN-PDU is received by SNDCP.

Availability: per SGSN service

SN-PDUs dropped

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to various reasons.

Triggers: Increments when SN-PDUs are dropped at SNDCP for various error cases as explained by the specific Drop reason counters below.

Availability: per SGSN service

SN-PDU Bytes dropped

Description: This proprietary counter indicates the total number of SN-PDU bytes dropped at SNDCP due to various reasons.

Triggers: Increments when SN-PDUs are dropped at SNDCP for various error cases as explained by the specific Drop reason counters below.

Availability: per SGSN service

SN-PDU Drop Reason:

Invalid SAPI State

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to invalid SAPI state.

Triggers: Increments when SN-PDUs are received in invalid SAPI state.

Availability: per SGSN service

Invalid PDP Ctx

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to invalid PDP context.

Triggers: Increments when SN-PDUs are received by a non-existent PDP Context or non-existent subscriber.

Availability: per SGSN service

Decode Failure

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to decode failure.

Triggers: Increments when Decode failures occur for SN-PDUs.

Availability: per SGSN service

Reassembly Drops:

Discard State

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP in discard state.

Triggers: Increments when SN-PDUs are dropped and an unexpected segment is received to enter discard state. SNDCP entity expects either a first segment or subsequent segment. Reception of last segment clears this state.

Availability: per SGSN service

Rx First Seg State

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP in Receive First Segment state.

Triggers: In receive first segment state, only first segment of N-PDU is expected. If subsequent segmented is received, it is dropped with this reason and enters discard state.

Availability: per SGSN service

Rx Subsequent Seg State

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to reassembly failure.

Triggers: In receive subsequent segment state, only subsequent segments of N-PDU are expected. If first segment is received, it is dropped with this reason and enters discard state.

Availability: per SGSN service

New First Segment

Description: This proprietary counter indicates the total number of buffered SN-PDUs dropped at SNDCP due to reception of new N-PDU.

Triggers: Increments when reception of new N-PDU drops buffered SN-PDUs, if any with this reason.

Availability: per SGSN service

Reassembly Failure

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to reassembly failure.

Triggers: Increments when SN-PDUs are dropped at SNDCP due to reassembly failure.

Availability: per SGSN service

Reassembly Timeout

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to reassembly timeout.

Triggers: Increments when the buffered segments are dropped and the last segment is not received before reassembly timer expiry.

Availability: per SGSN service

DCOMP Error

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to DCOMP (Data Compression algorithm ID) error.

Triggers: Increments when SN-PDUs are received with invalid DCOMP value or DCOMP value different from that negotiated between MS and SGSN.

Availability: per SGSN service

PCOMP Error

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to PCOMP (Protocol Header Compression algorithm ID).

Triggers: Increments when SN-PDUs are received with invalid PCOMP value or PCOMP value different from that negotiated between MS and SGSN.

Availability: per SGSN service

PDP Ctx Modified

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to PDP modification.

Triggers: Increments when buffered data segments (SN-PDUs) are dropped during PDP context modification.

Availability: per SGSN service

PDP Ctx Deleted

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to PDP deletion.

Triggers: Increments when buffered data segments (SN-PDUs) are dropped at SNDCP due to PDP context deletion.

Availability: per SGSN service

Other Reasons

Description: This proprietary counter indicates the total number of SN-PDUs dropped at SNDCP due to any other reason than those mentioned above.

Triggers: Increments when buffered data segments (SN-PDUs) are dropped at SNDCP due to other reasons than those mentioned above.

Availability: per SGSN service