Справочник Пользователя для 3com SuperStack II

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Dial-on-demand automatically dials the destination bridge/router when 
network traffic is present and hangs up when the network is idle. 
Dial-on-demand also provides failover support. If the primary line goes 
down, the bridge/router will failover to another available dial-up line, 
either from a dial pool or from another path assigned to the same port. 
The bridge/router may use multiple lines to acheive the normal 
bandwidth. 

To use failover or to use multiple lines to acheive normal bandwidth, you 
must have multiple phone numbers in the dial number list. The first 
number is for the primary line. If the primary line fails or provides less 
than normal bandwidth, the port dials the second number in the list, then 
the following numbers in succession if required. The dial number list 
allows you to use a different path for each phone number by specifying 
the baud rate and device type.

For example, the first number in my dial number list uses a 64 Kbps BRI 
line. The second number uses a 28.8 modem. If the ISDN line fails, the 
port will dial the 28.8 modem next.

See “Working with Dial Number Lists” on page 113 for more information 
about dial number lists.

To enable dial-on-demand, follow these steps:

1 Enable dial-on-demand for a port or virtual port using:

SETDefault !<port> -PORT DialInitState = DialOnDemand

2 Set the amount of time before the dial-up line is disconnected if it is not 

in use:

SETDefault !<port> -PORT DialIdleTime = <seconds> (0-3600)

Manual dial is enabled by default. To place a call manually, follow these 
steps:

1 If you have previously enabled dial-on-demand, enable manual dial using:

SETDefault !<port> -PORT DialInitState = ManualDial

2 Place the call using:

DIal !<port> [-PORT] [“<dial-string>”]