User Interfaces
DM240-DVB High-Speed Digital Modulator
4-24
TM083 - Rev. 3.0
4.12 The Management Information Base (MIB)
Management objects are defined in the Management Information Base (MIB), which uses a
hierarchical naming scheme. Within this scheme, each object is identified by an Object Identifier
(OID), a sequence of non-negative integers that uniquely describes the path taken through the
hierarchical structure.
MIB objects may then be specified either from the Root (which has no designator), or alternatively
from anywhere within the hierarchical structure.
For example: 1.3.6.1.4.1.2591.4 is equivalent to {iso(1). org(3). dod(6). internet(1). private(4).
enterprises(1). Radyne(2591). RCS10L(4)} (See Figure 4-4a and 4-4b).
In general, we are mainly concerned with just two groups that reside in the internet subtree,
namely the mgmt, and private groups. For completeness however, the four major groups are
discussed below:
4.12.1 Directory
{internet
1}
1.3.6.1.1
This area was reserved to describe how the OSI directory structure may be used in the Internet.
To date this has not been implemented and therefore is of little interest to us.
4.12.2 Mgmt
{internet
2}
1.3.6.1.2
This area was reserved to describe objects in the standard MIB. As RFCs defining new groups
are ratified, the Internet Assigned Numbers Authority (IANA) assigns new group IDs.
4.12.3 Experimental
{internet
3}
1.3.6.1.3
This subtree provides an area where experimentation is carried out. Only those organizations
directly involved in the experiment have any interest in this subtree.
4.12.4 Private
{internet 4}
1.3.6.1.4
This is possible the most important area of the MIB, since it is within this subtree that vendors
place objects specific to their particular devices. Beneath the private branch, there is a subtree
called enterprises, beneath which each vendor may define its own structure. Vendors are
assigned Private Enterprise Numbers (PENs) that uniquely identify them. They may then place
all objects specific to their devices in this tree, provided of course that the object conforms to the
format defined by SMI. Radyne ComStream Corporation’s Private Enterprise Number is 2591.
Other products are added to Radyne ComStream Corporation’s subtree as they become remotely
manageable through SNMP.
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