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CHAPTER 2 NDA-24296
Page 128
Revision 1.0
PH-SW12
Time Division Switch
The TONE ROM located on this circuit card contains the audible tones, such as Dial Tone, Busy Tone, Ring
Back Tone, etc. The music on hold source, either the MUSIC ROM or the external source via FM lead, is
located on the PLO card. The tone and the music are inserted into their time slot at this circuit card.
Additionally, this circuit card provides the Voice Prompt function that inserts the designated time slot of
PCM (Speech Path Memory : SPM) into the tone or music time slot.
Figure 2-59 Music/Tone Insertion
SEL
SEL
SEL
Speech Path Memory
for Music/Tone
Music/Tone
MUSIC ROM
TDSW00
PLO#0
TONE ROM
SEL
SEL
SEL
Speech Path Memory
for Music/Tone
Music/Tone
MUSIC ROM
TDSW1
PLO#1
TONE ROM
FM
FM