ADTRAN XRT - Manual (Page 40)

Chapter 3. Installing an Analog Modem
28 Express XR/XRT Quick Start Guide 61200.153L1-13
RS-232 Cable
COM Ports
ISDN Telephone
Wall Jack
ISDNU
OFF
ON
2 1 MODEM RS232 POWER
1 2 3 4
Express XRT
Analog Telephone
External
Analog
Modem
Rear View of PC
RS-232 Cable
Dial Line Jack
RJ-45 to RJ-11
Telephone Cable AC Outlet
RJ-11 to RJ-11
telephone cable
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 XR/XRT for detailed instruc-
tions.
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
analog modem.
4. Connect the other end of the same RS-232 serial cable to the
Express 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