Siemens SCALANCE X204RNA Operating Instructions Manual page 125

MIB
Managed Information Base. A tree structure containing all the data relevant for network
management in SNMP.
Mirroring
A port (mirror port) with its specific data traffic can be mirrored to another port (monitor port)
for test purposes. Protocol analysis devices can be connected to the monitor port, in other
words, the monitor port is not available for data exchange. Mirroring has no effect on the
mirror port.
MRP
→ Media Redundancy Protocol
Multicast
A frame with a multicast address is received by all nodes prepared to receive this address.
Multimode
In multimode transmission, the pulse is transferred using many modes (waves) that travel
along curved paths or are reflected within the core. Attenuation is mainly caused by physical
absorption and dispersion as well as by mechanical bending. The amount of attenuation
depends, among other things, on the wavelength of the input light. Multimode fiber-optic
cables have an outer diameter of 125 µm and 50 or 62.5 µm core diameter. Due to the larger
core diameter the pulse edges degrade more than in single mode transmission resulting in
shorter transmission distances.
PRP
PRP is a redundancy protocol for Ethernet networks. It is defined in the standard IEC 62439
(Industrial Communication Networks - High Availability Automation Networks) in Part 3
(Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR)).
With PRP, frames are exchanged at the same time via a two separate Ethernet networks. If
a transmission path is interrupted, the frame arrives at its destination via the second path.
This is bumpless without reconfiguration times to find new paths.
RMON
Remote Monitoring. RMON-compliant devices allow diagnostic data to be collected on the
device and read out by a network management station. This means that network problems
are detected early and can be eliminated. The particular advantage of RMON is that it is
independent of location. The acquired data can be analyzed at any point in the network with
suitable reporting software.
SCALANCE X204RNA SCALANCE X204RNA EEC
Operating Instructions, , C79000-G8976-C294-03
(PRP)
Glossary
125