2-4 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM
7 Connect the RJ-45 (8-pin) connector end of the
RJ-45/RJ-11 ISDN cable to the RJ-45 connector labeled
Wall on the digital modem’s back panel.
See Figure 2-1 for the location of the RJ-45 connector on the
digital modem’s back panel.
8 Connect the RJ-11 (6-pin) connector end of the
RJ-45/RJ-11 ISDN cable to the RJ-11 ISDN wall jack.
CAUTION:
The 3Com Impact digital modem is designed
to operate with Basic Rate ISDN 2B1Q U Interface network
terminations. An internal Network Termination device
(NT1) is built into the digital modem. Do not connect the
3Com Impact digital modem ISDN port to a standard
analog telephone jack or to an external NT1 device. Make
sure that it is connected to the ISDN jack.
9 Turn on the 3Com Impact digital modem by toggling the
power switch on the back panel to the On position.
See Figure 2-1 for the location of the power switch on the
digital modem’s back panel. The indicator LEDs on the front
panel (see Figure 2-2) flash momentarily as the unit
undergoes a power-up self-test diagnostic.
10 Turn on the computer’s power switch.
11 Go to the section “Configuration for IBM PC or
Compatible Computer” later in this chapter to configure
the 3Com Impact digital modem.
Installing the Digital Modem in an Apple Macintosh
Computer
To install the 3Com Impact digital modem model 3C875 or
3C877 in an Apple Macintosh computer:
1 Turn off the computer.
2 Ensure that the 3Com Impact digital modem power switch
is in the Off position.
