Nortel Circuit Card Installation Manual page 552

Page 552 of 906
Figure 110
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
553-3001-211 Standard 3.00
NT8D09 Analog Message Waiting Line card
PCM
PCM
Input/output
interface
control
Address/
data bus
PCM
Micro-
controller
Card LAN
interface
PCM
DS-30X
interface
Signaling
and status
Control
logic
Reg +5 V dc power
Reg +12 V dc power
August 2005
Line interface units 0–3
Codec
Line interface units 4–7
Codec
Line interface units 8–11
Codec
Line interface units 12–15
Codec
Line
signaling
interface
– 48 V dc
Analog
XFMR
hybrid
Signaling relays
Tip
(ringing, battery
Ring
reversal)
Loop current/
dialpulse detect
Message
waiting
Analog
XFMR
hybrid
Signaling relays Tip
(ringing, battery
Ring
reversal)
Loop current/
dialpulse detect
Message
waiting
Analog
XFMR
hybrid
Signaling relays Tip
(ringing, battery
Ring
reversal)
Loop current/
dialpulse detect
Message
waiting
Analog
XFMR
hybrid
Signaling relays
Tip
(ringing, battery
Ring
reversal)
Loop current/
dialpulse detect
Message
waiting
Line interface unit power
–150 V dc Rsync
light
power
Ringing
battery
Analog
telephone
lines
Analog
telephone
lines
Analog
telephone
lines
Analog
telephone
lines
553-6168