Enterasys csx400 用户手册

CSX400 and CSX400-DC User’s Guide 15

The ISDN back-up feature provides a back-up link for a remote site or branch office when one or 
more primary WAN interfaces for a frame relay circuit or a nailed-up PPP connection fails. The 
WPIM-S/T serves as the backup medium for this primary connection. The WPIM-S/T uses the 
ISDN interfaces to back-up any primary interfaces which have been configured for ISDN back-up. 

Time to Connect, Time to Disconnect, Connect Retries, Back-up Override, Input Idle Time-out 
and Output Idle Time-out, are the six back-up parameters used to manage the ISDN Back-up 
feature on the CSX400, and are described as follows:

Time to Connect allows you to configure the amount of seconds the primary 

interface can be in a failed state, before attempting to switch over to the back-up interface.

Time to Disconnect allows you to configure the amount of seconds the 

restored primary interface must remain connected, before attempting to switch over from the 
back-up interface.

Connect Retries allows you to configure the number of tries to restore the 

back-up interface, before giving up.

Backup Override forces the back-up interface to remain connected, and 

does not allow the back-up interface to switch back to the primary interface, even if the primary 
interface is restored.

Input Idle Time-out allows you to determine the amount of time necessary 

for data packets to be received, before the interface is automatically disconnected.

Output Idle Time-out allows you to determine the amount of time 

necessary for data packets to be transmitted, before the interface is automatically disconnected.