3Com 3812 Getting Started Guide - Page 61
Modem Cable, RJ-45 Pin Assignments, Table 10
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Modem Cable 61 Modem Cable Figure 21 9-pin to RS-232 25-pin (Switch 3812 and Switch 3824) Figure 22 RJ-45 to RS-232 25-pin (Switch 3848) RJ-45 Pin Assignments Pin assignments are identical for 10/100 and 1000 RJ-45 connectors. Table 10 Pin assignments Pin Number 10/100 Ports configured as MDI 1 Transmit Data + 2 Transmit Data - 3 Receive Data + 4 Not assigned 1000 Bidirectional Data A+ Bidirectional Data ABidirectional Data B+ Bidirectional Data C+
![](/manual_guide/products/3com-3812-getting-started-guide-87f5b68/61.png)
Modem Cable
61
Modem Cable
Figure 21
9-pin to RS-232 25-pin (Switch 3812 and Switch 3824)
Figure 22
RJ-45 to RS-232 25-pin (Switch 3848)
RJ-45 Pin
Assignments
Pin assignments are identical for 10/100 and 1000 RJ-45 connectors.
Table 10
Pin assignments
Pin Number
10/100
1000
Ports configured as MDI
1
Transmit Data +
Bidirectional Data A+
2
Transmit Data -
Bidirectional Data A-
3
Receive Data +
Bidirectional Data B+
4
Not assigned
Bidirectional Data C+