GarettCom 5843HRT User Manual page 18

Another variation of the point-to-point concept, is the Optical Star network. This topology may be created
using the Dymec Optical Star OS5 or OS9. This topology creates a "Hub and Spoke" configuration which
can be useful in solving a network configuration based upon the physical positioning of the nodes.
The Dymec Optical Stars can also be used to create a multi-drop Master / Slave Optical Star network. The
Model 5843HRT and 5844HRT are optically compatible with the OS5 and OS9 Master and Slave ports. Figure
9 shows a typical connection of an Optical Star network.
The master IED must always be connected to the Master port of the Optical Star. The slave IED's must always
be connected to the Slave ports of the Optical Star.
Variations of this configuration are as follows:
•
The optical star may be the last node of an optical bus configuration. One may create an Optical Bus
configuration starting with the Master IED to a series of Slave IED's and then connect the fiber network to
the Master port of the OS5 or OS9 to continue the network in a "Hub and Spoke" topology.
• A Master IED may be connected to the master port of an OS5 or OS9 and then an Optical Bus network
may be created from any Slave Port of the Optical Star.
•
The Optical Stars maybe "cascaded". Cascading means optically connecting a Slave Port of one Optical
Star to the Master Port of the next Optical Star.
•
IED's of different electrical formats (i.e., RS-232, EIA 422, EIA 485 2-wire or EIA 485 4-wire) may also be
interconnected optically in the Star Configuration. Models 5845HRT and Models 5846HRT are optically
compatible with the 5843HRT and 5846HRT and are used to serve to serve the EIA 422 and EIA 485
devices.
It is not recommended that a "loop network" be connected to an Optical Stars Slave Port
APPLICATION NOTE
NOTE
2-4
Models 5843, 5844, 5843S and 5844S
RS232 or TTL