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Chapter 3 - Basic Setup for Operation
SNMP Access Gateway User’s Manual - v1.0 -- 11/99 - Page 8
3.3 - Connections
A connection may be made to the SNMP Access Gateway via a network connection. When a connection is made,
the user is provided with a menu from which the desired mode of the connection is established. The user may select
to enter a command processor mode of operation, or may select a pass-through mode of operation. The user selects
the desired mode of operation from the menu, and then the user is prompted for the password for that mode of
access. If the user enters the proper password, then the desired mode of the connection is established.
A connection may be in one of four states. A first state is an idle state, in which no active connection for that
possible connection has been established. In the second state, a user has established a connection and the menu
selection for which type of connection is desired has not yet been made. In the third state the user has entered the
command processor. In the fourth state the user has entered pass-through access mode.
Three concurrent network connections, one local command port connection, plus an FTP server connection may all
exist with the SNMP Access Gateway. SNMP is connectionless, and may be use concurrently with any combination
of connections. The FTP server connection does not affect the other connections or use of command or pass-through
mode.
Only one valid command processor connection may exist at a time. Thus, if I/O 2 is in the local command port
mode, then requests to enter command processor mode via any of the network connections must be denied.
Similarly, if one of the network connections has been established as a command processor connection, then other
network connection cannot access the command processor until it has been made available once again. If a network
connection is in command processor mode, then the local command port mode on I/O 2 is also not allowed until the
command processor is available for re-assignment.
When a user opens a connection to the SNMP Access Gateway the user is provided with a menu from which the
mode of operation is selected, as shown below.
SNMP Access Gateway Model Version 1.00
0. Enter Command Processor
1. Enter Pass-Through to Port 1
2. Enter Pass-Through to Port 2
X. Exit (end connection)
A network connection can be broken by using the ‘X’ selection from the main menu. The network connection is then
placed into the idle state.
A network connection may also be broken from the client side using the disconnect feature of the client software.
Closing of the network connection places that connection into the idle state.
When a connection has been established and is in either the command processor or pass-through mode of operation,
the current operating mode should be terminated and the user should return to the main menu before closing the
connection to the SNMP Access Gateway. Closing a network connection should not result in any extra characters
being transmitted to either the command processor or a pass-through port.
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