Unit installation

LON – Network 3065
Page 27
12.0 Answers to the Most Common Questions Regarding
the Network
- Is it possible to use a cable that is already there for a twisted pair?
Yes, you can use a cable that is already there, as long as it holds two strands that are
not in use yet. However, the maximum range that can be attained with this cable is
considerably less than that reached with special Twisted-Pair cables, depending on
the nature of the cable.
- How long can a line be with a twisted pair?
Under optimum conditions, the maximum distance that can be attained is
approximately 900 m (roughly 2953 feet). By using routers and repeaters, however,
this distance can be extended to practically any length.
- Are there restrictions on the line topology?
In principle, the network is designed for mixed topology, which means that star and
series interfacing can be mixed in any combination and adapted to the local
conditions. In practice, there are restrictions regarding range and reaction time,
depending on the set-up used and the line lengths. Therefore, if structured cabling is
possible, especially in new buildings, it is better to pick a topology, usually BUS
cabling.
- After what line length should I use a router or repeater?
The number and position of routers/repeaters used depends greatly on the structure
of the planned network. If different buildings are networked together, however, a
router should always be provided.
- What is a router?
A router is needed in order to separate individual segments (such as floors or
buildings) from one another in large networks. From the entire data stream that
arrives at one side, it can filter out the data that is intended for the segment lying
behind it (data segmentation). Routers must be configured by SimonsVoss before
they are installed. Routers require a 230 V~ connection (outlet) via a separate plug-in
power supply for their own supply voltage.
- What is an LPI-10?
The LPI-10 is the power supply for the Twisted-Pair LockNodes. It consists of an
interface module and the power supply. The interface module prevents attenuation of
the data packets by the power supply and a defect of the supply voltage when there is
a short circuit on the network. The required input voltage of 48 V direct current is
supplied either by a plug-in power supply that can feed a maximum of 40 LockNodes,
or a larger plug-in power supply that is designed for a maximum of 62 LockNodes.