Nortel Networks 553-3001-211 manual Analog message waiting line card block diagram, Data bus

Page 540 of 894 NT8D09 Analog Message Waiting Line card

Figure 107

Analog message waiting line card – block diagram

Codec

Line interface units 0–3

PCM

Analog XFMR

hybrid

Signaling relays

(ringing, battery

reversal)

Loop current/

dialpulse detect

Message

waiting

Tip Analog

Ring telephone lines

Line interface units 4–7

Codec

PCM

Input/output

interface

control

Address/

data bus

Analog XFMR

hybrid

Signaling relays

(ringing, battery

reversal)

Loop current/

dialpulse detect

Message

waiting

Tip Analog

Ring telephone lines

Line interface units 8–11

Front	Codec
panel
LED
	PCM
	Micro-
	controller
Card slot
address
Backplane
	Card LAN

Analog XFMR

hybrid

Signaling relays

(ringing, battery

reversal)

Loop current/

dialpulse detect

Message

waiting

Tip Analog

Ring telephone lines

interface

Codec

Async card

Line interface units 12–15

LAN link

PCM

	Tx PCM
Controller	Rx PCM
card	5.12 MHz	DS-30X
		interface			Line
	clock
			Signaling	signaling
	1 kHz			interface
			and status
	frame sync

Analog XFMR

hybrid

Signaling relays

(ringing, battery

reversal)

Loop current/

dialpulse detect

Message

waiting

Line interface unit power

Tip Analog

Ring telephone lines

–150 V dc Rsync light

+8.5 V dc

Control

logic

Reg +5 V dc power

power

– 48 V dc Ringing battery

Power supplies

Ring generator

+15 V dc

Reg +12 V dc power

553-6168

553-3001-211 Standard 2.00 September 2004