I-2532 CAN to Fiber Converter User Manual (ver. 1.1, 2008/10/03) ------11
3 Network Deployment
3.1 Definition
The definition of segment in a CAN bus system are shown as following
figure. The segment 2 is fiber cable. Generally, the segment 1 and segment 3
are copper cable. The copper cable is a balanced (differential) 2-wire interface.
It may be a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or
Ribbon cable.
Figure 3-1 Segment in CAN bus system
3.2 Driving Capability
Before introducing the driving capability of I-2532, some characteristics of
copper cable must be assumed. The AC parameters are 120 impedance and
5 ns/m line delay, and the DC parameter follows the table shown below.
Table 3-1 Recommended DC parameters for CAN Bus Line
Wire Cross-Section [mm
2
]
Resistance [ /km]
~0.25
(AWG23)
< 90
~0.5 (AWG20)
< 50
~0.8 (AWG18)
< 33
~1.3 (AWG16)
< 20
Segment 1
Segment 2
Segment 3
CAN Bus
Fiber
I-2532
I-2532
ISO 11898-2
ISO 11898-2
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