3Com 10014299 manual Serial port view, list1 can be quoted

		Configure X.25 211
Receive calls with reverse charging requests	x25	reverse-charge-accept
	Or
	x25	map protocol protocol-address
	x121-address x.121-address
	reverse-charge-accept
Request throughput-level negotiation while	x25	call-facility threshold in out
initiating a call	Or
	x25	map protocol protocol-address
	x121-address
	x.121-addressthresholdin out
Cancel the request of throughput-level	undo x25 call-facility threshold
negotiation while initiating a call
Carry transmission delay request while	x25	call-facility send-delay
initiating a call	milliseconds
	Or
	x25	map protocol protocol-address
	x121-address x.121-address
	send-delaymilliseconds
Cancel the carrying of transmission delay	undo x25 call-facility send-delay
request while initiating a call
Specify the use of ROA (Recognized	x25	call-facility roa-name name 2
operating Agency)	Or
	x25	map protocol protocol-address
	x121-address x.121-address
	roa-name name 2
Cancel the use of ROA	undo x25 call-facility roa-name

window-sizeand packet-sizeoptions are also supported in x25 pvc command. However, in x25 pvc command, these two options specify the window size and maximum packet length of the set PVC. If these two options are not selected in the x25 pvc command, the set PVC will choose the default value of X.25 interface.

name is the name of the ROA ID list configured by the command x25 roa-listin the system view, for example:

[Router]x25 roa-list list1 12 34 567

In the serial port view, list1 can be quoted:

[Router-Serial0]x25 call-facility roa-name list1

5Configure the sending queue length of virtual circuit

The sending and receiving queue lengths of the virtual circuit can be specified for the X.25 of the 3Com Router series to adapt to different network environments. The default queue length can contain 500 packets, but if data flow is very large, or the transmission rate of the X.25 network is low, the queue length can be increased to avoid unexpected data packet loss.

In the interface view, perform the following tasks to specify the length of virtual circuit queue.

Table 252 Configure the sending queue length of virtual circuit

Operation	Command
Set the length of X.25 virtual circuit queue	x25 queue-length
	queue-size
Cancel set the length of X.25 virtual circuit queue	undo x25 queue-length

6Broadcast via X.25