Olson Technology MUSCLE-EM55X - Manual (Page 11)

OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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protocol can collect data from the transmitter and adjust the transmitter settings. Since the RS485 protocol is quite
complex, this option is only recommended for very advanced software engineers. Details on the protocol are given in a
separate document “Olson Technology device specific messages” which can be obtained from Olson Technology on
request.
The Figure 4 below explains how the OTOT-EM55XL interfaces to other devices and a SNMP EMS.
Figure 4 — OTOT-EM55X Interfacing with Other Equipment and a SNMP EMS
In this figure the OTOT-EM55XL with embedded NEC (upper right corner) is connected to other (Olson Technology)
devices via the RS485 interface. In the example there is an optical amplifier (without embedded NEC) in 19”-1RU
housing, similar to the OTOT-EM55X, and in total four sub racks interfacing to the RS485 bus. A variety of Olson
Technology devices, such as EDFA’s, optical switches, optical transmitters and receivers, can be mounted on these
subracks. All of these connected devices only provide RS485 slave interfaces, since the NEC of the OTOT-EM55XL is
the dedicated RS485 bus master, polling all other devices. The NEC (SNMP Proxy Agent) polls all devices and trans-
lates this information to Ethernet-HTTP and Ethernet-SNMP.
In the example, there is a PC (e.g. notebook) with a HTML Browser (such as Microsoft Internet Explorer, Netscape or
Opera) is connected. If the Browser accesses the IP address of the NEC, which can be set in order to fit to the require-
ments of a LAN, the Webserver within the NEC responds and displays information of all polled devices on the
Browser screen. Using the PC it is possible to get access to data of all devices as well as to change settings of all de-
vices.
Simultaneously, a SNMP EMS (Element Management System) such as Cablewatch from Olson Technology is option-
ally connected to the Ethernet interface. This connection can be realized using a LAN or a WAN between the EMS and
the OTOT-EM55XL. This EMS corresponds with the OTOT-EM55X using SNMP (simply network management pro-
tocol).
The OTOT-EM55XL 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 Emails or SMS etc.