Symmetricom XLi IEEE 1588 User Manual

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to maintain backward compatibility. There are two varieties of expansions to consider: additional 
products and additional features within an existing product.

This model makes adding additional products and maintaining compatibility a straightforward process. 
Each additional product will be given a branch in the tree under enterprises.Truetime.products. For now, 
we have only enterprises.Truetime.products.xli and enterprises.Truetime.products.nic56k. 

Future products will take the form enterprises.Truetime.products.product.XXX. Each product will use 
enterprises.Truetime.products.product.XXX as its system object identifier. Each product will also define 
an enterprises.Truetime.products.product.XXX.xxxTrap subgroup for the definition of all enterprise 
specific traps that can be generated by that product.

Making additions to the XLI product MIB is also a straightforward task with several caveats. The first is 
that additions may be made but the object identifier and the semantics of existing objects may not be 
altered. A likely place for additions is under the systemStatusDetail group as addition system objects are 
defined.

A place holder group xliOptionCards has been defined but currently has no accessible members. This 
group will be used for the management of optional add on cards. It is suggested that each sub-group 
under xliOptionCards be defined as a table to allow for the possibility of multiple option cards of a 
particular type.

Depreciation: In SNMP when an SNMP variable or group of variables is no longer recommended for 
use, they are listed as deprecated in the formal definition of the MIB. Users are often times still allowed 
to use this data, but the MIB’s authors for one reason or another no longer recommend it. 

Enterprise MIB: See Private Enterprise MIB.

IANA - Internet Assigned Number Authority: This is the group at IETF that is in charge of assigning 
Internet related numbers like Ethernet addresses, TCP/UDP port numbers and SNMP Private Enterprise 
MIB numbers.

IETF – Internet Engineering Task Force: The group responsible for standardizing numerous Internet 
communication protocols.

Management agent: An Internet connected remote host that accumulates the raw data that is entered 
into the MIB and Enterprise MIB for that host. This data is at some point transmitted to a Management 
station. In other network applications this would be called a network server of the SNMP protocol.

Management station: An Internet connected remote host that consumes SNMP data provided by a 
Management agent for the display of human network managers. In other network applications this would 
be called a client of the SNMP protocol.

MIB – Management Information Base: This is the data structure for the SNMP protocol. The current 
version of this standard, that is in general use, is MIB II defined by RFC’s 1213 and 1212.