Nortel Networks 553-3001-211 manual Trunk card block diagram

Page 620 of 894 NT8D15 E&M Trunk card

Figure 140

E&M trunk card – block diagram

	Input/output
		interface
		control
			Address/
			data bus
				Trunk interface units 0–3
	Front
	panel
	LED		Codec					Facility
							Tip/ring
		Micro-	PCM		Analog			services
						XFMR	(2/4 wire)	interfaces
		controller			hybrid		Voice
								(2-W E&M,
	Card slot				Signaling relays		band	4-W E&M,
								and Paging)
Back-	address				(ringing, battery
plane					reversal)		E&M	Signaling
		Card LAN			Loop current/		Sup.	interface
							signaling
		interface			dialpulse detect
	Async card
	LAN link
	Tx PCM
Con-	Rx PCM
troller	5.12 MHz	DS-30X			Line interface unit power
card		interface		Trunk
	clock
			Signaling	signaling
	1 kHz
				interface
			and status
	frame sync
					+5 V dc	Ringing
					analog
			Control	±15 V dc	hybrid		Rsync
			logic		Ð 48 V dc
				analog	battery
				power
Power	+8.5 V dc	Reg	+5 V dc logic power
								553-6201
supplies

•Software control of A/µ-Law mode.

•Software control of digit collection.

553-3001-211 Standard 2.00 September 2004