Model: MC-1-M (2U)
Doc. Ref. no. : - m05/om/101
Issue no. 14
Page 81 of 103
User’s Manual
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NTP output stops during Telnet session in progress.
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Refer Manual Appendix E for Procedure to Connect and Configure MC-1-M
model through Telnet session.
13.2 SNMP
The Simple Network Management Protocol (SNMP) has been created to achieve a standard for the
management and monitoring different devices connected on the same network from some remote
location. SNMP has SNMPv1, SNMPv2c and SNMPv3 standards available. SNMP is operating on the
application layer and uses different transport protocols (like TCP/IP and UDP), so it is network hardware
independent. SNMP protocol is having client-server architecture, where server is called as agent and
client called as manager.
GPS Master Clock model MC-1-M device supports and operates as SNMPv1 / SNMPv2c agent, designed
especially to handle SNMP requests for model MC-1-M specific status information. GPS Master Clock
model MC-1-M SNMP agent is also capable of handling SET requests in order to manage the
configuration via SNMP, if SNMP management software is also supports this feature. User need to
configure SNMP manager IP address for particular GPS Ethernet IP address using telnet session with
that particular Ethernet port.
The elements (objects / variables) are organized in data structures called Management Information Base
(MIB).The agent is also responsible for controlling the database of control variables defined in the
product’s MIB.
13.2.1 SNMP Addressing:
SNMP addressing is structured as a very large tree database. A root node address is an integer value
that ranges from 0 to some very large number. Conceptually, there are no limits to the numbers of sub
nodes either. SNMP addressing is written in “dotted decimal” notation. For example, the address of GPS
Master Clock model MC-1-M MC-1-M product name Enterprise MIB variable is “1.3.6.1.4.1.38306.1.1.0”,
this is also known as OID (Object Identifier). The address fragment 1.3.6.1.4.1 is fixed by the IANA
(Internet Assigned Number Authority) and is the address of the SNMP Private Enterprise MIB’s. The
38306 is the address assigned by IANA to
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assigns the
addresses after that at our discretion and design.
13.2.2 Protocol Detail:
SNMP operates in the Application Layer of the Internet Protocol Suite. The manager may send requests
from any available source port to port 161 to the agent. The agent will response back to the manager
address on port 162. The manager receives notifications (Traps and Inform-Requests) on port 162.
SNMPv1 specifies five core protocol data units (PDUs). Two other PDUs, Get-Bulk-Request, and Inform-
Request were added in SNMPv2. The seven SNMP protocol data units (PDUs) are as follows:
i) GET-Request: This PDU is used to get the values of a list of variables from a
particular host.
