Hitachi SV.LINK User Manual page 88

Restrictions on multi-port transceiver installation positions
When multi-port transceivers are installed on the most distant coaxial cable
segment in a system in which the maximum length of coaxial cables is
2,500 m (five segments), data delay time increases due to the installation.
To avoid this, restrictions are placed on the multi-port transceiver installation
positions. The maximum distance between stations via multi-port
transceivers decreases by 100 m (in terms of coaxial cable length) if it passes
one single multi-port transceiver. For this reason, there is the following
restriction on the coaxial cable length (L [m]) of the route from a station to
another station:
L [m] ≤ 2,500 [m] - 100 × N [m]
N: Total number of passing multi-port transceivers
In a system consisting of coaxial cables of 2,500 m in total, set a multi-port
transceiver 100 m or more inside from the most distant coaxial cable
terminator (such terminator position decreasing the distance between
stations).
Coaxial segment
500 m
100 m
MPT
R
S
NOTICE
Link segment Coaxial segment
500 m
R
Link segment
500 m 500 m
R
：S10mini or S10V
S
：MELSEC
M
MPT
：Multi-port transceiver
R ：Repeater
6-5
6 USER GUIDE
Coaxial segment
500 m
100 m
MPT
R
M
(cont.)