3Com VCX V7111 Installation Manual page 20

4FXO and 4FXS Rear Panel Connectors
Figure 6
1
5
Figure 6 Legend
Table 5
1 Power Supply Socket
2 10/100 Base-T RJ-45 Port
3 Four RJ-11 FXS/FXO Ports
4 RS-232 Port
5 Grounding Screw
6 Label 'FXS' or 'FXO'
20
3
2
6
4
VCX V7111 Fast Track Installation Guide