Total Control MP/16, Operator'S Manual

Page: 38 / 182

3-2 Using Total Control MIBs
♦
The terms NAC or “card” refer to the modem modules.
♦
The modem modules and management module occupy slots
1,2, and 3 from top to bottom.
Command Tables
Understanding the concept of the command table is important and
necessary to fully utilize the management capabilities of Total
Control. The concept of this table was borrowed from RFC1229
(
Generic Extensions to the Interfaces Table
), but was enhanced to fit
the needs of U.S. Robotics.
The basic functionality provided by the command table is the
ability to use an SNMP SET request to activate an action or
command. The command table also provides for parameter
passing and result polling. In addition, a mechanism for handling
multiple management stations was implemented to help in
situations where more than one Network Manager is trying to issue
a command at the same time.
A typical use of the command table follows:
1
An SNMP SET operation is used to set the
Function
object.
Issuance of this SET operation also internally sets the read-only
ReqId object to the value of the request-id field in the SNMP
SET PDU.
2
If the MP/16 is able to handle the command, the read-only
Result object is set to inProgress(3) and activation of the
command begins.
3 If the command is not supported by the particular device for
which the command was sent, the
Result
object is set to
notSupported(4) and the command is ignored.
4
If the device is in a state such that it is unable to execute the
command at the particular time it was issued, the
Result object
is set to unAbleToRun(5) and the command is ignored.
5 At this time, the management station issues SNMP GET
requests to repeatedly poll the Result and Code of the
requested command.