Siemens SCALANCE X308-2M User Manual

Network topologies
3.3 Ring with redundancy manager
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12
35
Functional description
The two ends of the bus are closed to form a ring by a IE Switch X-300 operating as a
redundancy manager. Both the redundancy manager and the other IE switches (redundancy
clients) in the ring must be interconnected via their ring ports (see below).
The redundancy manager function is enabled by the SELECT/SET button or by a setting in
the software. For more detailed information, refer to the configuration manual
"SCALANCE X-300 and SCALANCE X-400 Industrial Ethernet Switches".
In contrast to the ring ports of the redundancy clients, the ring ports of the redundancy
manager are disconnected when the network is operating problem-free. The IE Switch X-300
operating in the role of redundancy manager mode monitors the connected bus over its ring
ports and switches the ring ports through if there is an interruption on the connected bus; in
other words, it restores a functioning bus over this substitute path. Reconfiguration is
achieved within 0.3 s. As soon as the problem is eliminated, the original topology is restored;
in other words, the ring ports in the redundancy manager are disconnected from each other
again.
In a ring with media redundancy, only one device can operate as the redundancy manager.
Electrical ring ports
An electrical ring with redundancy manager can be set up via the RJ-45 connectors that
allow attachment of electrical (twisted pair) connections (10, 100 and/or 1000 Mbps). The
SCALANCE X310FE is an exception to this. This device only allows attachment of electrical
(twisted-pair) connections at 10 or 100 Mbps.
You can configure which ports take on the function of ring ports individually. The following
table shows the factory defaults for the ring ports.
Device Factory setting for the ring ports
X-300 Port 9 and port 10
X-300 EEC Port 8 and port 9
X-304-2FE Port 1 and port 2
X-306-1LD FE Port 2 and port 3
X308-2M Port 1 and port 2
X-320-1FE Port 1 and port 2
X-320-3LD FE Port 1 and port 2
XR324-4M Port 1 and port 2
XR324-12M Port 1.1 and port 1.2
Optical ring ports (1000 Mbps)
The use of the IE Switch X-300 in an optical ring with a redundancy manager is basically
possible. For operation in the optical ring, the optical ports 9 and 10 are the defaults.
Exception:
● The SCALANCE X310 and X310FE devices do not have optical ports.
● The optical ports of the X-300EEC support only 100 Mbps.

Siemens SCALANCE X308-2M Specifications

General

Brand	Siemens
Model	SCALANCE X308-2M
Category	Network Router
Language	English