Actiontec electronic Plug n' Play Voice/Fax Modem V.90 ISA - Manual (Page 8)

8
Connecting Devices to the Modem
Figure 4: Connecting Devices
On the rear panel of your modem are input jacks to connect devices to the modem.
As shown in the diagram, there are jacks for connection to a “phone” and to a phone
“line.” The connector labeled “Line (Telco)” is meant to be connected to a standard
analog phone line. To help reduce the load on your phone line, it is recommended
that all other devices be disconnected while the modem is in use.