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The following table lists the configuration fields in the PPP tab of the USP Configuration dialog 
box and their descriptions:

For USPs configured with a frame relay interface, the USP dialog box contains five tabs:

●

 - Basic information abut the USP. For information on the fields in the Serial Port 

tab of the USP - Frame Relay dialog box, refer to 

●

 - Information about the channels that comprise the interface. For information on 

the fields in the Advanced tab of the USP - Frame Relay dialog box, refer to 

.

●

 - Information about the frame relay configuration on the USP.

The IP address of the PPP session’s peer.

Maximal Transmission Unit. The size of the largest packet that can be 
transmitted over this PPP session.

The number of seconds between keepalive messages. If this is 0, 
keepalive messages are not sent.

The operational status of the interface. Possible statuses include:

●

Up - The interface is up and can transmit and receive packets.

●

Down - The interface is down due to some failure, and cannot 
transmit or receive packets.

●

Testing - The interface is in testing mode and cannot transmit 
or receive regular data.

●

Standby - The interface is a backup interface and cannot 
transmit or receive packets unless the primary interface it 
backs up fails.

●

Disabled - The interface is disabled. It cannot transmit or 
receive packets.

●

Partially Down - The interface is up. However, some interfaces 
(or PVCs) layered on top of this interface are Down. Some 
packets can be transmitted and received.

IP Control Protocol. The state of IPCP for this PPP session. Possible 
statuses include:

●

Open - IP packets can be transmitted and received over the 
PPP session.

●

Not-Opened - IP Packets cannot be transmitted and received 
over the PPP session.

The interface configured to back up this interface.