LLC SAP Statistics

Data transfer

Data requests Rx

Number of LLC data requests received from the MS.

Data confirms Tx

Number of LLC data requests confirmation sent to the MS.

Data indications Tx

Number of LLC data indications sent to the MS.

Data-Sent indications Tx

Number of LLC data sent indications sent to the MS.

Unit data requests Rx

Number of LLC unit data requests received from the MS.

Unit data requests Rx Drop

Description: This proprietary counter indicates the total number of unit data requests received from SNDCP layer and dropped at the LLC layer.

Triggers: Increments when LLC receives a downlink packet from SNDCP and the queue in LLC layer is full.

Unit data indications Tx

Number of LLC unit data indications sent to the MS.

Errors reported

Discarded frames Rx

Number of LLC discarded frames received from the MS.

Discarded frames Tx

Number of LLC discarded frames sent to the MS.

Error frames Rx

Number of LLC error frames received from the MS.

Unrecognised frames Rx

Number of LLC unrecognized frames received from the MS.

XID collisions

Number of LLC exchange identifier (XID) request collisions.

OC Increments done

This counter indicates how many times the OC value is incremented by "512". Overflow Counter (OC) is incremented by "512" every time the received LFN (LLC Frame Number -> N(U)) wraps around from "512" to "0", and re-starts counting from "0".

Ciphering errors

Number of LLC ciphering errors.

FCS errors

Number of LLC frame check sequence errors.

LLC Frame statistics

Octets Rx

Number of bytes of LLC frames received from an MS.

Octets Tx

Number of bytes sent from the LLC layer to an MS from the SGSN.

Unack frames Rx

Number of unacknowledged UI frames received at the LLC layer from an MS.

Unack frames Tx

Number of unacknowledged UI frames sent from the LLC to an MS.

UI Rx

Number of LLC frames with unnumbered information received from the MS.

UI Tx

Number of LLC frames with unnumbered information sent to the MS.

UI Ciphered frames Rx

Number of LLC frames with ciphered unnumbered information received from the MS.

UI Ciphered frames Tx

Number of LLC frames with ciphered unnumbered information sent to the MS.

XID Rx

Number of XID-reset messages received from the MS.

XID Tx

Number of XID-reset messages sent to the MS.