AT&T 945 ユーザーズマニュアル

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Convenience Ports
If you want to connect another device (such as a modem or fax machine) 
to the wall jack, you can use the jacks on the phone labeled AUX. These
convenience ports use Lines 3 and 4; a call picked up on Line 3 or 4 at
another extension may interrupt fax, modem, or message transmission.
Four One-Line Jacks
INST
ALLA
TION
INST
ALLA
TION
Modular telephone 
jacks Lines 3 
and 4 with 
two-line adapter
Modular telephone jacks 
Lines 1 and 2 with 
two-line adapter
Standard
electrical
outlet
Power adapter
L1/L2 jack
L3/L4 jack
AUX L4 jack
AUX L3 jack