Specifications

LONWORKS® LN-Series Network Communication and Interface Guide Technical Bulletin22
Repeaters
Use a repeater to extend the limits of a channel. On an FTT-10 channel type,
device count and network length restrictions exist. The maximum number of
devices on a FTT-10 channel is 64. See the Network Cables section for network
length restrictions. These restrictions vary according to the topologies and cable
types being used. When you reach the device count or cable length limit, you can
use a repeater or a router to amplify signal. Using a repeater increases the
maximum network length and increases the limit of the number of devices attached
to a channel. When using a repeater, you can add a maximum of 128 devices to one
FTT-10 channel.
A repeater is a device that is physically attached to the LONWORKS network and is
transparent to the network database.
Subsystems
Subsystems allow you to break large networks into more manageable parts in the
software. For example, when creating a control network, each subsystem can
represent each floor of the building. Alternately, each subsystem can contain a
complete air system including the Air Handling Unit (AHU) and its associated
Variable Air Volume (VAV) box. Use subsystems to organize devices. Subsystems
are not physical components and have no relation to network communications.