3Com 7750 Series, Installation Manual

Page: 68 / 74

68 A
PPENDIX
A: S
WITCH
7750 C
ABLES
Figure 40 The AUX Cable
Table 48 lists the AUX cable pin-outs.
Electrical Port
Connector
Figure 41 illustrates the RJ-45 connector.
Figure 41 The RJ-45 Connector
Table 49 lists RJ-45 MDI port pin-outs.
Table 48 AUX Cable Pin-outs
RJ-45 Signal Direction DB-25 DB-9
1 RTS ---> 4 7
2 DTR ---> 20 4
3 TXD ---> 2 3
4 CD <--- 8 1
5 GND --- 7 5
6 RXD <--- 3 2
7 DSR <--- 6 6
8 CTS <--- 5 8
Enlarged B side Enlarged B side
Enlarged A side Enlarged A side
Enlarged C side Enlarged C side
DB25 Male DB25 Male
Label Label
DB9Male DB9Male
8P8C Plug 8P8C Plug
Table 49 RJ-45 MDI Port Pin-outs
Pinout 10BASE-T/100BASE-TX 1000BASE-T
Signal Function Signal Function
1 Tx+ Send data BIDA+ Send data to direction A
2 Tx- Send data BIDA- Receive data from direction A
PIN #8
PIN #1