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Fast Ethernet 48-port Cable Pinouts

The Fast Ethernet 48-port PIC has four VHDCI connector ports on its faceplate (see Figure 121), each of which accepts one of the four RJ-21 cables supplied with the PIC (see Figure 122). Each VHDCI connector port supports 12 Ethernet ports.

Figure 121: Fast Ethernet 48-port PIC

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Figure 122: VHDCI to RJ-21 Cable

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Table 36 describes the RJ-21 cable pinouts.

RJ-21 pin numbers 25 and 50 do not appear in the table because they are ground connectors.

Table 36: RJ-21 Pin Assignments

Ethernet Port Numbers

RJ-21 Pin Assignment
  TX - TX + RX - RX +

0, 12, 24, 36

2

27

1

26

1, 13, 25, 37

4

29

3

28

2, 14, 26, 38

6

31

5

30

3, 15, 27, 39

8

33

7

32

4, 16, 28, 40

10

35

9

34

5, 17, 29, 41

12

37

11

36

6, 18, 30, 42

14

39

13

38

7, 19, 31, 43

16

41

15

40

8, 20, 32, 44

18

43

17

42

9, 21, 33, 45

20

45

19

44

10, 22, 34, 46

22

47

21

46

11, 23, 35, 47

24

49

23

48
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