Nortel NT1R20 Description page 241

Figure 61
Analog message waiting line card—block diagram
Front
panel
LED
Card slot
address
Backplane
Async card
LAN link
Tx PCM
Rx PCM
Controller
card
5.12 MHz
clock
1 kHz
frame sync
+8.5 V dc
Power
supplies
+15 V dc
Ring
generator
NT8D09 Analog Message Waiting Line Card
Codec
PCM
Codec
PCM
Input/output
interface
control
Address/
data bus
Codec
PCM
Micro-
controller
Card LAN
interface
Codec
PCM
DS-30X
interface
Signaling
and status
Control
logic
+ 5 V dc power
Reg
Reg +12 V dc power
Line interface units 0–3
Line interface units 4–7
Line interface units 8–11
Line interface units 12–15
Line
signaling
interface
Line interface unit power
–150 V dc
– 48 V dc
battery
Page 217 of 290
Analog
XFMR
hybrid
Signaling relays Tip
Analog
(ringing, battery
telephone
Ring
reversal)
lines
Loop current/
dialpulse detect
Message
waiting
Analog
XFMR
hybrid
Signaling relays
Tip
Analog
(ringing, battery
telephone
Ring
reversal)
lines
Loop current/
dialpulse detect
Message
waiting
Analog
XFMR
hybrid
Signaling relays
Tip
Analog
(ringing, battery
telephone
Ring
reversal)
lines
Loop current/
dialpulse detect
Message
waiting
Analog
XFMR
hybrid
Signaling relays Tip
Analog
(ringing, battery
telephone
Ring
reversal)
lines
Loop current/
dialpulse detect
Message
waiting
Rsync
light
power
Ringing
553-6168
Line cards Description