How to Manage
User Manual for AZ110 Broadcast Satellite Modulator with ASI interface
version 3.2
46
SHAPING THE FUTURE SATELLITE OF COMMUNICATIONS
5.5.1.2
Protocol Functioning
The control unit sends a “request” message to a device identified by its unique
address. The addressed device interprets the message, performs the requested
action and sends a “response” message back.
The receiving device rejects all messages with transmission errors without any
further action.
The addressed device responds to all correct formatted messages – except for
some special system messages – with an acknowledge message. Only in a few
restricted cases does the device not respond to a request from the control unit.
This is, for example, the case when a general device reset is requested.
Correctly received messages which the device cannot handle are refused via a no-
acknowledge “error” message. This message contains the reason why the
message is rejected.
A device never sends messages on its own initiative. It only responds to a request
from the control unit. The total transmit time of a complete message may not
exceed 250ms. If the message is not completed within this time, it is discarded.
5.5.2
Simple Network Management Protocol (SNMP)
The SNMP manual explains how the Newtec device can be
managed using SNMP. of this device. This manual is delivered on
CD-ROM together with the device.
