OnAir 3000 Digital Mixing Console
Operation 5-139
Document generated: 10.10.14
SW V6.0
Each of these system messages is also entered to the Log List. In order to be
removed from the Log List, it has to be acknowledged by the user.
To prevent the user from being annoyed with lots of warning and error mes-
sage dialog boxes, these are generated only where it is impossible to notice
function execution failure. In these cases an error message is generated if the
function execution fails completely. A warning is given to the user if a func-
tion might be executed partially only.
5.12.3 SNMP (Simple Network Management Protocol)
SNMP is used in network management systems for monitoring devices con-
nected to the network for conditions that require administrative attention.
The ‘traditional’ SNMP management is implemented: The management task
is subdivided into two layers – agents and managers. The agents provide
management data that is read out and processed by the manager.
Basic Concept
Management
Station
SNMP Manager
OnAir 3000 Subsystem
TRAP
GET
Response
GET
Request
SNMP Agent
The OnAir 3000 SNMP implementation allows monitoring a large variety of
parameters, including operating status, communication, power supplies, etc.
These parameters are called ‘managed objects’.
Managed Objects Overview
Operating Status
Communication
Power Supply Version + Firmware
Network
Connection Status
D21m
DSP Card
Time Sync
Audio Clock
D21m Extensions
D21m
Audio Clock
DSP Card
Time Sync
ProBel
I/O Sharing
Host System
Memory
Disk Space
COM Port
SNMP Agent
Ember
Surveillance Proc
The manager may send requests for available parameter values. Furthermore,
an agent can send information to the network in an active way, as soon as a
surveyed parameter exceeds a specified threshold (such as a level). Informa-
tion sent when exceeding a threshold is called ‘trap’. Traps are usually used to
transfer critical system messages that need to be sent on an emergency basis.
An SNMP manager may analyse traps, monitor messages, and alert or even
send an SMS to a specified mobile phone.
A management information base (MIB) describes the structure of the manage-
ment data for OnAir 3000. It uses a hierarchical namespace containing object
identifiers (OID). Each OID identifies a variable that can be read via SNMP.