LONWORKS Routers and Repeaters
The first table below compares the attributes of routers and repeaters. The second table
compares the attributes of different types of routers.
Router Physical Layer Repeater
Ethernet Analogy Router Hub
OSI Layer 3 1
Transceiver Type Any TP/FT-10, TP/LP-10
Maximum in series Virtually unlimited1 1
Ports 2 Unlimited (typ: 8)
Power Supply Yes Yes (except linkpower)
Logical Installation Required Not required
Typical delay (TP/FT-10) 3-4ms (not including queuing 60 s (typ)
for media access)
Local Buffering Yes No
Transparent to collisions No Yes2
Transparent to noise No No
Transparent to bad packets No Yes
Packet filtering Yes No
Repeater Bridge Learning Configured
Packet validation Yes Yes Yes Yes
Packet filtering No Domain Domain, Domain,
Transparent to Always Always Always, if no Always, if no
Service Pin subnet given subnet given
Configuration N/a N/a Automatic By network
after each management
Redundant No No No Possible
Same subnet on both Possible3 Possible4 Not allowed Not allowed
The maximum number of routers in series is determined by the maximum transmit timer (3072ms) on one hand and the sum of
channel delays and router delays on the other. The maximum number of routers in a row is by far in excess of what a good design
should include, thus virtually unlimited.
Due to propagation delays through the physical layer repeater, a collision might occur on one side of the PLR in isolation. The
corrupt packet, which results from the collision, appears on all ports, as the PLR is transparent to bad packets.
, Prevents future changes to a different router type.