NEC NEAX 2000 IPS Installation Manual page 272

• If a D.C. voltage is supplied with the tone from the external tone source/announcement machine, a
transformer or coupling capacitor should be used as shown below.
Connecting External Tone Source/Announcement Machine Supplied with D.C.
Ring
TO COT
Tip
TO PBX
K
Ring
TO COT
Tip
TO PBX
K
TRANSFORMER
TO CONTROL CIRCUIT
FROM PN-DK00
CAPACITOR
2 µF
TO CONTROL CIRCUIT
FROM PN-DK00
External Tone Source/Announcement Machine (DK/TNT/MP)
CAPACITOR
2 µF
SOURCE
EXTERNAL TONE SOURCE/
ANNOUNCEMENT MACHINE
– 256 –
SOURCE
R
DC
VOLTAGE
SOURCE
EXTERNAL TONE SOURCE/
ANNOUNCEMENT MACHINE
R
DC
VOLTAGE
SOURCE
NWA-008841-001 Rev.5.0
90ch2002.fm