3com 3031 Instruccion De Instalación

C

HAPTER

 77: M

ODEM

 C

ONFIGURATION

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Implementing the interactive login to remote systems. Interactive negotiation 
of the scripts can enable the system enters different link states. For example, 
after the asynchronous serial interfaces on the two routers set up a connection 
via the modem, the routers can negotiate the protocol to be encapsulated with 
the physical link and its operating parameters.

The modem script format in common use is as follow:

Where:

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Normally, 

 and 

 appear in pairs, and the script 

must begin with a receive-string. For example, “

” represents the execution flow: Expect to receive 

receive-string1, and send send-string1 to the modem if the received string 
matches receive-string1 before timing out. Otherwise, the execution of the 
subsequent script will be terminated.

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If the last string is a send-string, it indicates that the execution of the script will 
be terminated after the string is sent without waiting for any receive-string.

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If it is unnecessary to receive a string at the beginning of a script, and the 
system can directly wait for the send-string, then the user can set the first 
receive string to "", which will be explained later.

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Except for ending with “\c”, the send-string will be automatically added with 
an additional return character to its end when it is sent.

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A receive-string is matched via the location-independent matching method. 
That is, the match is considered successful as long as the received contents 
contain the expected string.

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The match operation on a receive-string will be considered successful if the 
receive-string is matched with any expected receive-strings which are separated 
with “-“. 

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By default timer will timeout after 5 seconds while waiting for a receive-string. 

 can be inserted into the script at anytime to adjust the 

timeout time waiting for the receive-string, which is valid till a new 

 is 

set in the same script.

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All the strings and keywords in a script are case sensitive.

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Both the strings and keywords are separated by spaces. If a space is contained 
in a string, it should be put in the double quotation marks (" "). A pair of 
empty quotation marks (that is, "") has two meanings. Being a leading "" in a 
script, it means that no string is expected from the modem and the system will 
directly send the strings to the modem. If "" locates in any other locations, the 
string content will be regarded to be "".

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 can be inserted at any point in a script to change the 

script execution flow. Its presence in the script indicates that the script 
execution will be terminated if a received string is fully matched the 
receive-string set by 

. Multiple ABORT entries can be 

defined in a script, and they will take effect concurrently. Once a received string 
matches any of them, the script execution will be terminated. Regardless of