Olson Technology OT-1000-HH Rev.X4 - Manual (Page 9)

025-000573 Rev. X4 - 9 - www.olsontech.com
Principle of Element Management ***
Advanced features of the OT-1000-HH can be accessed through a network element controller, such as the
Olson OT-NEC-A via the RS485 interface. The OT-NEC-A polls the OT-1000-HH as well as many other
connected devices and provides an Ethernet interface for easy connections to a network management system
(NMS) or personal computer (PC). The operation of these features is covered in the ADVANCED OPERA-
TION MANUAL for the OT-1000-HH.
The picture below explains how the OT-1000-HH interfaces to other devices and a SNMP EMS.
Figure 3 — The OT-1000-HH interfacing with other equipment and a SNMP EMS.
All of these connected devices only provide RS-485 slave interfaces, since the NEC is the dedicated RS-485
bus master, polling all other devices. This embedded NEC, which is in fact a proxy agent, polls all devices
and translates this information to Ethernet-HTTP and Ethernet-SNMP.
In the example, there is a PC (e.g., notebook) with an HTML browser (such as Microsoft Internet Explorer,
Netscape, Mozilla or Opera). If the browser accesses the IP address of the NEC, which can be set in order to
fit to the requirements of a LAN, the web server software running on the NEC responds and displays infor-
mation of all polled devices on the browser screen. Using the PC, it is possible to get access to the data of all
devices as well as to change settings of all the devices.
Simultaneously, in the example there is optionally an SNMP EMS (Element Management System) connected
to the Ethernet interface. This connection can be realized using a LAN or a WAN between the EMS and the
OT-1000-HH. This EMS corresponds with the NEC using SNMP (simple network management protocol).
The NEC supports at the same time HTTP and SNMP on the Ethernet interface. The EMS can be imple-
mented to enable a more sophisticated alarm management with alarm filtering, alarm acknowledgement and
automatic messaging through e-mails or SMS etc.
See the ADVANCED OPERATION MANUAL for the OT-1000-HH for a detailed of how these SNMP fea-
tures operate.