3Com DIGITAL MODEM Placing Calls Using the Phone Out Port, Receiving Calls Using the Phone Out Port

2-18 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM

CAUTION: The 3Com Impact digital modem is designed to

operate with telephones that are compatible with the original

AT&T 2500 touch-tone telephone standard. 3Com guarantees

proper operation of up to three compatible touch-tone devices

on the Phone Out port. The digital modem is designed to

provide power and ringing for these three devices on up to 100

feet of AWG 26 or heavier AWG wiring. Although the digital

modem may function satisfactorily at longer cable distances

with more than two attached telephones, proper operation at

longer cable distances is not guaranteed in all situations.

Specialized telephone equipment, most notably speaker

phones that draw signiﬁcantly larger amounts of power, may

not work at all on the digital modem’s Phone Out port. These

devices do not conform to the loop current (power)

speciﬁcation of the 2500 touch-tone telephone standard, and

their operation is not guaranteed.

Placing Calls Using the Phone Out Port

To place an outgoing call, simply take the telephone

handset or external fax machine off the hook, wait for a dial

tone, and dial the destination telephone number.

Receiving Calls Using the Phone Out Port

lncoming calls to the telephone number assigned to the

Phone Out port ring at the Phone Out port unless you are

busy on another Phone Out port call. If the port is busy, the

incoming call is automatically disconnected.

If you have a digital modem with an internal analog fax

modem (models 3C872 and 3C877) you can have calls routed

to the internal analog fax modem when the Phone Out port

is busy. To do this, the digital modem must be conﬁgured to

allow a call to be routed to both the Phone Out port and the

internal analog fax modem, as described in the section

“Conﬁguring the 3Com Impact Digital Modem.”