Nortel DMS-100 Series Maintenance Manual page 75

Figure 2-23 Functional block diagram of the Star Module
To host
Star
Hub
Scan and
distribution
point
Fans
Temperature
sensor
ac power in
ac/dc
rectifier
1 or 2 DS-1s to Star Hub
LTU
Telephony subsystem
C-side
P-side
dc panel
–48 V
Battery
DMS-100 Family NA100 Star Remote System XPM15 and up
Star Remote System hardware 2-55
SMC
CPU
Matrix
LMU
Power
+5 V
converter
and ringer Ringing
–48 V
Line
cards
MDF and
RFI filter
To subscriber lines