097-93100-01 Revision C – February, 2010 TimeCreator 1000 User’s Guide 269
Appendix B Command Descriptions and Communications Interface
Simple Network Management Protocol
SNMP Features
The Simple Network Management Protocol (SNMP) is an application layer protocol
that allows you to manage network devices. SNMP is based on a client-server
query-response mode that requires an Ethernet connection. A manager application
(software installed on a computer) is the client generating the queries, and an agent
(software on the TimeCreator 1000) is the server generating responses. The
TimeCreator 1000 SNMP supports most existing functions.
If SNMP is present, port 161 becomes the port of standard SNMP interactive
communications and port 162 becomes the trap port.
SNMP allows you to perform the following functions:
Alarm management
GPS input configuration
DTI client and server port configuration
TOD source configuration
SNMPv3 Security Features
SNMPv3 provides additional security features not available in SNMPv2c. In addition
to the functions of SNMPv2c, SNMPv3 allows user levels that are based on
authentication and privacy settings. The authentication protocol HMAC-SHA-1-96 is
20 characters long and the privacy protocol CBC-DES is a 16-character key. All
keys are uppercase.
The administrator can add up to 20 users to the SNMP user table.
Management Information Base
The Management Information Base (MIB) is a virtual database of managed objects,
their object identifiers, and variables. Typical MIB object identifiers include the
TimeCreator 1000, its modules, module features, input ports, output ports, etc. and
variables that include settings and measurements.
The MIB is controlled by the TimeCreator 1000’s SNMP agent. The SNMP agent is
a server program that sends TimeCreator 1000 status (stored in the MIB database)
to the network manager when the manager transmits GET or GETNEXT messages.
The manager can also transmit SET messages that instruct the agent to set MIB
variables to new values. The TRAP message is used by the server to send the
manager indications of MIB occurrences, such as a fault condition.
SNMP Users and Manager Addresses
SNMP CLI commands allow you to:
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