Samsung Mobile WiMAX Outdoor RAS SPI-2331 System Description page 49

CHAPTER 3. Outdoor SPI-2331 Architecture
The EMI carries out SNMP agent and web server function, and provides the OAM
interface between the management system(WSM, Web-EMT and CLI Terminal) and the
outdoor SPI-2331 by providing the IMISH. Then, to access the outdoor SPI-2331 directly
via the Web-EMT or the console terminal, the process of the operator authentication and
the authority allowance via the Web-EMT or Pluggable Authentication Module(PAM)
block should be done.
The Main OAM is located in the main processor. The Main OAM communicates with the
upper management system by interworking with the EMI block and distributes the
Programmable Loading Data(PLD) to the lower processors by managing the system
configuration as the format of the PLD. In addition, the Main OAM performs the role of
the Image Server(IS) and the Registration Server(RS), collects and saves the statistics data
and the failure information, and reports them to the upper management system.
Each sub block is implemented in the ULDB and it has a singleplex structure.
3.3.3.1 SNMP Daemon (SNMPD)
SNMPD plays the SNMP agent role to support the standard SNMP(SNMPv2c or SNMPv3c)
and an interface role for the upper management system(WSM) and interworks with internal
subagent. While receiving requests on the standard MIB object from WSM are processed
by SNMPD itself, it transmits requests on the private MIB object to subagent in order to be
handled properly.
The main functions of SNMPD are as follows:
Standard MIB processing
If the request for the MIB-II object is received, the SNMPD processes it directly and
transmits the response.
Private MIB processing
If the request for the Private MIB object is received, it is not processed directly by the
SNMPD, but it is transmitted to the corresponding internal subagent, and then the
response is transmitted from the subagent and it is transmitted to the manager.
3.3.3.2 Common SNMP Agent Subagent (OAGS)
OAGS plays the SNMP subagent role to support the standard SNMP(SNMPv2c or SNMPv3c).
Also, through master agent(SNMPD) OAGS plays an interface role for the upper
management system for the command inquiry and change of ACR to be operated through
the get/get-next/get-bulk/set/trap command defined by SNMP.
The main functions of OAGS are as follows:
Providing private MIB
− Provide private MIB to the management system.
− Generate the message data file necessary for the interface function between OAM
blocks.
SNMP command processing
Process the command received from the management system and transmit the
corresponding result via the SNMPD.
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