Echelon LonWorks Twisted Pair Control Module Bedienungsanleitung PDF herunterladen (Seite 32)

24 Network Cabling and Connection

Figure 12. Using a Router to Meet the 8-in-16 Topology Rule

The second remedy to a violation of the 8-in-16 rule is to add additional cable to

the bus such that the rule is no longer violated (see Figure 13). It is important

to ensure that the maximum bus length (130 meters of 22 AWG [0.65 mm] Level

IV or AWG 24 [0.511 mm] ANSI/TIA/EIA-568-B.2-2001 Category 5 or Category 6

twisted-pair cable) is not exceeded by the additional cable. Because of the

complex interactions between the bus and the transceivers with regard to

reflections and transmission line delays, it is not possible to substitute an LC

network in place of the additional cable to resolve this rule violation.

Figure 13. Using Additional Bus Cable to Meet the 8-in-16 Topology Rule

Cable Terminations – TP/XF-78, -1250 Segments

Twisted pair network segments require termination for proper data transmission

performance. For doubly terminated bus topologies, a termination must reside at

both endpoints of the bus. The terminations required for TP/XF-78, TP/XF-78F,

and TP/XF-1250 segments are shown in Figure 14 on page 25.

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Echelon LonWorks Twisted Pair Control Module Bedienungsanleitung Seite 32