LAPD Link Measurement

The LAPD link is the signaling transfer channel between the BSC and the BTS, and between the BSC and the PCU.

LAPD Link Measurement is used to measure the number of Q921 protocol frames related to the LAPD link on the BSC side.

LAPD Link

The following table lists the measurement counters related to LAPD Link Measurement.

Counter	Refer to Section...
L5001:Q921_SABME_TX	SABME or SM Frames Sent on LAPD Link
L5002:Q921_SABME_RX	SABME or SM Frames Received on LAPD Link
L5003:Q921_REJ_TX	REJ or SREJ Frames Sent on LAPD Link
L5004:Q921_REJ_RX	REJ or SREJ Frames Received on LAPD Link
L5005:Q921_RNR_TX	RNR Frames Sent on LAPD Link
L5006:Q921_RNR_RX	RNR Frames Received on LAPD Link
L5007:Q921_RESEND_TX	I Frames Resent on LAPD Link
L5008:Q921_ERR_RX	Incorrect I Frames Received on LAPD Link
L5009:Q921_DATA_RX	I Frames Received on LAPD Link from Application Layer
L5010:Q921_I_TX	I Frames Sent on LAPD Link
L5011:Q921_I_RX	I Frames Received by LAPD Link
L5012:Q921_I_OVER	I Frames Discarded by LAPD Link
L5013:Q921_UA_TX	UA Frames Sent on LAPD Link
L5014:Q921_UA_RX	UA Frames Received by LAPD Link
L5015:Q921_UI_RX	UI Frames Received by LAPD Link