Siemens SCALANCE X204RNA Operating Instructions Manual page 126

Glossary
RNA
Redundant network access, connection point for connecting end devices/network segments
not capable of PRP to parallel networks.
RSTP
Rapid Spanning Tree protocol. Variant of the Spanning Tree protocol optimized for speed.
This protocol prevents loops forming in multiple, redundant network connections. If there is
an interruption on a connection, the network is automatically reconfigured so that there is
exactly one connection between all nodes.
Secure Shell
→ SSH
Secure Socket Layer
→ SSL
Segment
In the Ethernet bus system, transceivers connected together over the bus cable along with
the nodes connected over patch cables form a segment. Several such segments can be
connected via repeaters. When using twisted pair and fiber-optic cables, each subsection
forms a segment.
SFF
Small Form-Factor
The SFF slot is used to insert SFP modules. See also SFP.
SFP
Small Form-Factor Pluggable.
SFP is a specification for modular optical or electrical transceivers for network connections.
SFP modules fit in an SFF slot and can be replaced simply and quickly (hot swapping).
Signaling contact
Floating relay contact via which the detected error states can be signaled.
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SCALANCE X204RNA SCALANCE X204RNA EEC
Operating Instructions, , C79000-G8976-C294-03
(PRP)