ADTRAN user manual Figure A-1 NT1 T400 Circuit Pack Connector Pin Assignments

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	S/T Transmit	DT	55	56
			53	54
	(Customers 1 & 2
			51	52
	in parallel)
		DR	49	50
		TR	47	48
			45	46
	U Transmit/Receive		43	44
		TT	41	42
			39	40
			37	38
		-48V	35	36
			33	34
			31	32
			29	30
	Frame GND		27	28
	1 Backup Power		25	26
		E	23	24
	S/T Power		21	22
		M
			19	20
		GND	17	18
		R1	15	16
			13	14
	S/T Transmit	Frame	11	12
	(Customers 1 & 2	GND	9	10
	in parallel
			7	8
	1 When pin 25 is pulled to ground,	T1	5	6
			3	4
	the NT1 Type 400 is signaled that
	its battery backup is in use.		1	2
	Figure A-1: NT1 T400 Circuit Pack Connector Pin Assignments
10	NT1 T400 User Manual			61212016L1-1