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, Subnet, Subnet, Group Group Transparent to Always Always Always, if no Always, if no Service Pin subnet given subnet given Messages Configuration N/a N/a Automatic By network after each management reset tool Redundant No No No Possible configurations Same subnet on both Possible3 Possible4 Not allowed Not allowed sides 1 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. 2 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. 3 4 , Prevents future changes to a different router type.
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