# ISDN_PROTOCOL_PARMS_LAPD parameters

The ISDN_PROTOCOL_PARMS_LAPD structure contains parameters that configure the ISDN protocol stack for LAPD. Either this structure or ISDN_PROTOCOL_PARMS_Q931CC is passed to isdnStartProtocol, depending upon how the ISDN protocol stack is configured.

For more information, refer to Initializing ISDN protocol stack instances. For a definition of the data structure, refer to ISDN_PROTOCOL_PARMS_LAPD structure.

Type | Parameter | Description | Default value | Range of values
--- | --- | --- | --- | ---
DWORD | size | Size of the structure. | None. |
WORD | rate | Data rate. | ISDN_RATE_64K | ISDN_RATE_64K, ISDN_RATE_56K
WORD | max_FEC_errors | Maximum number of framing errors allowed during the T198 interval. | 20 | 0 or more ms
timer_val_t | t101 | Milliseconds of bad framing before disabling sending of D channel packets. | 750 | 0 or more ms
timer_val_t | t102 | Milliseconds of good framing before enabling sending D channel packets. | 50 | 0 or more ms
timer_val_t | t198 | Observation period for frame error count. | 5 | 0 or more seconds
WORD | tei_time_assignment | TEI time assignment. | 0 | (reserved)
WORD | tei_time_removal | TEI time removal. | 0 | (reserved)
BYTE | bpad1[2] | Padding for 8 byte alignment. | 0 | 0
WORD | nfas_group | NFAS group number if duplicate NAI values. | 0 | ON or OFF