ADTRAN Express XRT manual Connecting an External Analog Modem, External Analog Modem Application

Chapter 3. Installing an Analog Modem

Rear View of PC	COM Ports
RS-232 Cable	RJ-45 to RJ-45
AC Outlet	Cable

OFF

ON

POWER RS232 MODEM

2 1 ISDNU

NT1 ISDN Telephone Wall Jack

	RS-232 Cable	Express XRT
External	RJ-11 to RJ-11
	telephone cable
Analog
Modem	Dial Line Jack

Analog Telephone

Figure 3-1

External Analog Modem Application

Connecting an External Analog Modem

To connect an external analog modem to the Express XRT use the following procedure:

1.Ensure the Express XRT is connected to the PC. See the section Connecting the Express XRT on page 6 for detailed instructions.

2.Ensure the modem power is OFF before connecting it to the Express XRT.

3.Connect one end of the RS-232 serial cable to the external ana- log modem.

4.Connect the other end of the same RS-232 serial cable to the Ex- press XRT port labeled MODEM. An illustration of a modem is positioned above the modem port.

5.Connect one end of the RJ-11 to RJ-11 telephone cable to the telephone jack labeled 2 on the Express XRT. Positioned above the jack is an illustration of a telephone above a modem.

28 Express XRT User Guide 61202.153L3-1