AT&T DataPort PCX Modem User Manual page 19

Internal Modem Installation
5. Remove the modem from its shipping bag.
!
CAUTION:
Do not touch the contacts along the bottom edge or any
components on the modem. Handle the modem only by its
outer edges.
Keep the ESD bag in case the modem must be removed or
returned for service.
6. Verify that the modem's switch settings are configured
for the correct COM port. See Figure 3-1 and Table 3-1.
Configure the switches for the COM port/IRQ settings
recommended by the COMTEST program you ran before
installation. If you change the switches, remember the new
settings for when you install your communications software.
Use a small pointed object, such as a pen tip, to change
switches. Table 3-1 lists switch settings for each COM port.
Refer to the documentation for your PC to verify if any
jumpers or switches within the PC should be changed.
Figure 3-1. COM Port Switch Location
3-4
Issue 2 July 1995