AT&T 7200 series, 7500 series, 7100 series Dpr, Acr, Crq, Pnd, Pwi, Cos, NB1, NB2, NB4, NB8, Dlo

LEAD DEFINITIONS E-5

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		Table E-4.EIA RS-366 LEADS/DEFINITIONS
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⎜ PIN		⎜	EIA	⎜	LEAD DESCRIPTION	⎜	MPDM	⎜
⎜		⎜		⎜		⎜		⎜
⎜ NO.		⎜	INTERCHANGE	⎜	(FUNCTION)	⎜	INPUT/	⎜
⎜		⎜	CIRCUIT	⎜		⎜ OUTPUT		⎜
⎜	1	⎜	AA	⎜ Unassigned		⎜	—	⎜
⎜	2	⎜	DPR	⎜	Digit Present	⎜	I	⎜
⎜	3	⎜	ACR	⎜	Abandon Call and Retry	⎜	O	⎜
⎜		⎜		⎜		⎜		⎜
⎜	4	⎜	CRQ	⎜	Call Request	⎜	I	⎜
⎜	5	⎜	PND	⎜ Present Next Digit		⎜	O	⎜
⎜	6	⎜	PWI	⎜ Power Indication		⎜	O	⎜
⎜	7	⎜	AB	⎜	Signal Ground	⎜	—	⎜
⎜	8	⎜	—	⎜	Unassigned	⎜	—	⎜
⎜		⎜		⎜		⎜		⎜
⎜	9	⎜	+P	⎜	Reserved for Testing	⎜	O	⎜
⎜ 10		⎜	–P	⎜ Reserved for Testing		⎜	O	⎜
⎜ 11		⎜	—	⎜ Unassigned		⎜	—	⎜
⎜	12	⎜	—	⎜	Unassigned	⎜	—	⎜
⎜	13	⎜	COS	⎜	Call Origination Status	⎜	O	⎜
⎜		⎜		⎜		⎜		⎜
⎜	14	⎜	NB1	⎜	Digit Signal Circuit	⎜	I	⎜
⎜ 15		⎜	NB2	⎜ Digit Signal Circuit		⎜	I	⎜
⎜ 16		⎜	NB4	⎜ Digit Signal Circuit		⎜	I	⎜
⎜	17	⎜	NB8	⎜	Digit Signal Circuit	⎜	I	⎜
⎜	18	⎜	—	⎜	Unassigned	⎜	—	⎜
⎜		⎜		⎜		⎜		⎜
⎜	19	⎜	—	⎜	Unassigned	⎜	—	⎜
⎜ 20		⎜	—	⎜ Unassigned		⎜	—	⎜
⎜ 21		⎜	—	⎜ Unassigned		⎜	—	⎜
⎜	22	⎜	DLO	⎜	Data Line Occupied	⎜	O	⎜
⎜	23	⎜	—	⎜	Unassigned	⎜	—	⎜
⎜		⎜		⎜		⎜		⎜
⎜	24	⎜	—	⎜	Unassigned	⎜	—	⎜
⎜ 25		⎜	—	⎜ Unassigned		⎜	—	⎜