Toshiba nv Series Instruction Manual page 24

Chapter 1 Introducing DN912
Max. length of trunk line between two nodes = Max. cable length (value in Table 1.2)
In the case of Figure 1-5, the maximum trunk line length from Node 0 to Node n is the maximum cable length
(Table 1-2) minus the drop line length of Node 0 and Node n.
Termination
Node 0
(c) Figure 1-6 shows the maximum distance between two nodes when a trunk line consisting of a thick cable
and a thin cable is used together and a drop line is used. Use the formula in Table 1-3 to determine the
maximum cable length. In this case, the "maximum length of the trunk line between the two nodes" is as follows.
Maximum length of trunk line between two nodes = Maximum cable length (value in Table 1.3) -Drop line
In the case of Figure 1-6, the maximum trunk length from Node 0 to Node n is the maximum cable length
(Table 1-3) minus the drop line length of Node 0 and Node n.
8
6F8C1877
-Drop line length of nodes at both ends of trunk line
Distance between two nodes ≤ maximum cable length
Node 2
Figure 1-5 Distance between two nodes in a network using drop lines
Table 1-3 Maximum cable length (thick cable / thin cable mixed)
Rate
125 kbps L-thick + 5 × L-thin ≤ 500[m]
250 kbps L-thick + 2.5 × L-thin ≤ 250[m]
500 kbps L-thick + L-thin ≤ 100[m]
L-thin: Length of trunk line using thin cable (m)
L-thick: Length of trunk line using thick cable (m)
Node 3
length of nodes at both ends of trunk line
Formula
Termination
Node n