3Com MSR 30, MSR 50 manual Lapb modulo, Link-protocol lapb dce dte ip multi-protocol

436CHAPTER 26: LAPB AND X.25 CONFIGURATION COMMANDS

View	Interface view
Parameter	k-value: Maximum number of sequence numbered frames to be acknowledged by
	DTE or DCE during any specified time. If the modulo is 8, the value of the window
	parameter K ranges 1 to 7. If the modulo is 128, the value of the window
	parameter K ranges 1 to 127.
Description	Use the lapb window-sizecommand to configure the LAPB window parameter
	K.
	Use the undo lapb window-sizecommand to restore the default.
	The default is 7.
Related command:	lapb modulo.
Example	# Set the LAPB window parameter K on the interface Serial 2/0 to 5.
	<Sysname> system-view
	[Sysname] interface serial 2/0
	[Sysname-Serial2/0] lapb window-size 5

link-protocol lapb

Syntax	link-protocol lapb [dce dte ] [ ip multi-protocol ]
View	Interface view
Parameter	dce: Specifies DCE mode of LAPB.
	dte: Specifies DTE mode of LAPB.
	ip: Specifies the upper layer protocol as IP.
	multi-protocol: Specifies the upper layer protocol as multi-protocol.
Description	Use the link-protocol lapb command to specify the link layer protocol of the
	interface as LAPB.
	By default, the link layer protocol of an interface is PPP.
	When the link layer protocol is LAPB, the default operating mode is DTE, and the
	upper layer protocol is IP.
	Though LAPB is a layer-2 protocol of X.25, it can act as an independent link-layer
	protocol for simple data transmission. Generally, LAPB can be used when two
	routers are directly connected with a dedicated line. At that time one end works in
	the DTE mode, and the other in the DCE mode.