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M120 Fast Ethernet PIC 48-Port Cable Pinouts
The Fast Ethernet 48-port PIC has four VHDCI connector ports on its faceplate (see Figure 1), each of which accepts one of the four RJ-21 cables supplied with the PIC (see Figure 2). Each VHDCI connector port supports 12 Ethernet ports.
Figure 1: Fast Ethernet 48-port PIC
Figure 2: VHDCI to RJ-21 Cable
Table 1 describes the RJ-21 cable pinouts.
 | Note: RJ-21 pin numbers 25 and 50 do not appear in the table because they are ground connectors. |
Table 1: 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 |
