Defining LAPB Parameters

Your network may require some adjustment to the values set by default for LAPB operation. The following are the CLI commands for defining the LAPB parameter values.

CLI> define lapb parameters busyTimer

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<BusyTimer>	Integer (0..65535)	Enter the value to be used for the busy timer (the time to wait before transmitting an RR frame after receiving an RNR from the remote end). The default value is 10000.

CLI> define lapb parameters receiveKWinSize

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<ReceiveKWinSize>	Integer (1..127)	Enter the receive PDU window size for this interface. This is the maximum number of unacknowledged sequenced PDUs that may be outstanding from the remote end at any one time. The default value is 7.

CLI> define lapb parameters rxmitCount

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<RxmitCount>	Integer (0..65535)	This is the N2 retry counter. This counter specifies the number of times a PDU will be resent after the T1 timer expires without an acknowledgement for the PDU. The default value is 20.

CLI> define lapb parameters sequencing

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<Sequencing>	modulo8 | modulo128	Select the modulus used for the LAPB sequence numbers. The default value is modulo8.

CLI> define lapb parameters stationType

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<StationType>	dte | dce	Select the station type for this interface. The default value is dce.

CLI> define lapb parameters t1AckTimer

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<T1AckTimer>	Integer (1..65535)	The T1 timer specifies the maximum time in milliseconds to wait for an acknowledgement of a PDU. The default value is 3000.

CLI> define lapb parameters t2AckDelayTimer

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<T2AckDelayTimer>	Integer (100..65535)	The T2 timer specifies the maximum time in milliseconds to wait before sending an acknowledgement for a sequenced PDU. 0 means there is to be no delay generating the acknowledgement. The default value is 100.

CLI> define lapb parameters t3DisconnectTimer

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<T3DisconnectTimer>	Integer (1..65535)	The T3 timer specifies the time in milliseconds to wait before considering the link to be disconnected. 0 means the link will be disconnected upon completion of the frame exchange to disconnect the link. The default value is 60000.

CLI> define lapb parameters t4IdleTimer

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<T4IdleTimer>	Integer (0..2147483647)	The T4 timer specifies the maximum time in milliseconds that may elapse with no frames being exchanged on the data link. 0 disables the T4 timer function. The default value is 60000.

CLI> define lapb parameters transmitKWinSize

Parameter	Range of Values	Required Action
<Index>	Integer (1..255)	Enter the index number assigned to this LAPB interface.
<TransmitKWinSize>	Integer (1..127)	The default transmit window size for this interface. The transmit window size specifies the maximum number of unacknowledged PDUs that may be outstanding from this end of the connection at any one time. The default value is 7.