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CHAPTER 3 NDA-24219
Page 86
Revision 2.0
NAP-200-007
Sheet 37/55
Termination of Cables on MDF
• If a D.C. voltage is supplied with the tone from the external tone source equipment, a transformer or cou-
pling capacitor should be used as shown in Figure 007-27.
Figure 007-27 Connecting Tone Source Supplied with D.C.
TO PBX
TO COT
Ring
Tip
K
TRANSFORMER
SOURCE
CAPACITOR
SOURCE
TO COT
Tip
K
Ring
TO CONTROL CIRCUIT
FROM PN-DK00
2 µF
TO PBX
TO CONTROL CIRCUIT
FROM PN-DK00
CAPACITOR
2 µF
R
R
EXTERNAL EQUIPMENT
EXTERNAL EQUIPMENT
DC
VOLTAGE
SOURCE
DC
VOLTAGE
SOURCE