3Com 3C882 manual Installing the Isdn Cable

Installing the ISDN Cable 2-5

2Connect 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:

1Connect 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.

U

	-232	ISDN
RS

2

1

RESET

9VDC

. 5A MAX

Figure 2-5 ISDN Cable Connection

2Connect 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.