Installing the ISDN Cable
2-5
2
Connect the other end of a serial cable to a serial COM
port on the back of your computer and tighten the
connector screws.
On a PC, most COM port connectors are labeled COM,
SERIAL, or RS-232-D. On an IBM AT® PC and most laptops or
notebooks, connect the cable to a 9-pin COM port connector.
If your PC has a 25-pin serial port connector, you will need to
install a standard 9-pin to 25-pin adapter.
On a Macintosh computer, the COM port is the mini DIN
8-pin serial connector depicted by the telephone handset.
Installing the ISDN Cable
To install the ISDN cable:
1
Connect the RJ-45 (8-pin) connector end of the
RJ-45/RJ-11 ISDN cable to the RJ-45 ISDN line port labeled
ISDN U on the 3C882 ISDN modem’s back panel, as shown
in Figure 2-5.
Figure 2-5
ISDN Cable Connection
2
Connect the RJ-11 (6-pin) connector end of the
RJ-45/RJ-11 ISDN cable to the RJ-11 ISDN wall jack.
CAUTION:
An NT1 is built into the 3C882 ISDN modem.
Never connect the 3C882 ISDN modem ISDN port to a
standard analog telephone jack or to an external NT1
device. Make sure that it is connected directly to the ISDN
jack.
RESET
9 VDC
. 5A MAX
RS-232
ISDN U
1
2
