Network Deployment; Definition; Driving Capability - ICP DAS USA I-2532 User Manual

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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.
Segment 1
ISO 11898-2

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
~0.25 (AWG23)
~0.5 (AWG20)
~0.8 (AWG18)
~1.3 (AWG16)
I-2532 CAN to Fiber Converter User Manual (ver. 1.1, 2008/10/03) ------11
CAN Bus
Segment 2
Fiber
I-2532
Figure 3-1 Segment in CAN bus system
2
]
Segment 3
ISO 11898-2
I-2532
Resistance [ /km]
< 90
< 50
< 33
< 20