First Data FD300Ti Quick Setup Manual page 9

Dial-up (dedicated line)
Phone Cord
Dial-up
Option 2
Phone Cord
Terminals are certified to process on dedicated analog lines or
optional IP connections: Digital or rollover lines can reduce
processing accuracy (Example: a doctor's office with rollover lines
or voiceover IP (VOIP) are not supported). Terminals sharing
a line with another device such as a fax machine cannot process
if that device is active on the line.
PhONE/FAX
Option 1
PhONE
JACk
PhONE
JACk
9 3