3Com 10014299 manual Interface view, perform the following task

		Configure X.25 209
Table 248 Specify/Cancel SVC maximum idle time
	Operation	Command
	Specify maximum idle time for all the SVCs on an	x25 timer idle minutes
	interface
	Specify maximum idle time for SVC associated	x25 map protocol
	with an address mapping	protocol-address
		x121-address x.121-address
		timer idle minutes
	Cancel specify maximum idle time for all the SVCs	undo x25 timer idle
	on an interface

By default, the value of SVC maximum idle time is 0 minute, which means this SVC will not be disconnected for idle times out.

2Configure the maximum number of SVCs that are associated with the same address mapping

The maximum number of virtual circuits to be set up on the same address mapping can be specified. The X.25 of the 3Com Router series can establish up to 8 virtual circuits on one address mapping. In case of large traffic and low line rate, this parameter can be increased properly to reduce data loss. By default, one address mapping is associated with only one virtual circuit.

In the interface view, perform the following commands.

Table 249 Specify/Cancel the maximum number of SVCs associated with the same address mapping

Operation	Command
Specify the maximum number of SVCs	x25 vc-per-map count
associated with all address mappings on an
X.25 interface
Specify the maximum number of SVCs	x25 map protocol
associated with an address mapping	protocol-address
	x121-address x.121-address
	vc-per-map count
Cancel the maximum number of SVCs	undo x25 vc-per-map
associated with all address mappings on an
X.25 interface

By default, the value of nvc is 1.

3Configure the pre-acknowledgment of packets

According to X.25 protocol, the receiving party will send an acknowledgment only after the receiving window is full (the number of received packets equals the window-sizein-packetsvalue). However, in some X.25 networks, the delays may be long, resulting in low efficiency of sending and receiving. Therefore, we specify a value. Each time the number of received packets reaches the value, the acknowledgment will be sent to the peer, thus improving receiving and sending efficiency. This value, called a "receive-threshold", ranges between 0 and window-sizein-packets. If it is set to 1, every packet will be acknowledged. If it is set to window-sizein-packets, the acknowledgment will be sent only after the receiving window is full. In applications requiring a high response speed, this function is especially important.

In the interface view, perform the following task.