5
DAU
Modem Printer
Single DAU Installation
HUB
10Base-T or 10Base-FL network
PC
DAU 1 DAU 2 DAU 3
LSU
Modem
Networked IDM Installation
PC
LAN/WAN
HUB
10Base-T or 10Base-FL network
DAU 1 DAU 2 LSU
Printer
Networked IDM Installation with Connection to a WAN
Typical Installations
In those installations where more than one IDM DAU is
installed at a given location then they communicate with
each other using twisted pair or fibre-optic Ethernet. To
interconnect devices using Ethernet a hub is required and
some sample network topologies are shown below. Twisted
pair Ethernet communications , also known as 10Base-T,
has a maximum range of 100m (300 feet) under normal
conditions however care should be taken in substation
installations to avoid induced transients from other
conductors. For this reason it is not normally recommended
to extend twisted pair Ethernet cables beyond an adjacent
cubicle in a substation environment. Fibre-optic Ethernet
networks, also known as 10Base-FL, can be extended to
over 1 kilometre while using multi-mode fibre.
This figure
shows a single
DAU installation
with modem
communications and
local printer.
The figure below shows a networked IDM installation with a
local PC, and LSU for mass storage, local printing and remote
communications.
The figure above shows a networked IDM installation with a
connection to a Wide Area Network where data can be
automatically transferred to a remote PC on the network.
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