Network Topologies; Redundant Optical Ring (Hiper-Ring) - Belden HIRSCHMANN OZD Modbus Plus G12 Manuel

2 Network Topologies

2 Network Topologies
2.1 Redundant optical ring (HIPER-Ring*)
This network topology is used in the case of an optical
link between data terminal units or bus segments.
The implementation of a redundant link with OZD Modbus
Plus G12 ... repeaters ensures a high degree of reliability.
As many repeaters as required can be operated in a
HIPER-Ring. For the safe and reliable operation of the
ring redundancy, it is necessary that at least one active
terminal unit is connected to the electrical port (Port 1)
of each OZD Modbus Plus G12 ... Repeater.
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
Modbus Plus bus line
Fiber optic cable
Fig. 2: Network structure in redundant optical two-fiber ring topology
* HIPER-Ring = Hirschmann Performance Redundancy Ring
Version 04 07/2014
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
2.1 Redundant optical ring (HIPER-Ring*)
The failure of an optical cable between any two OZD
Modbus Plus G12 ... repeaters does not affect the avail -
ability of the network.
The repeaters detect total failure of an optical link. The
port LED of the faulty link is deactivated and the failure
is indicated by illumination of the red system LED and
response of the signaling contact.
It is advisable to install the duplex optical cables of the
two optical channels along different routes.
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
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