AT&T 7100 series, 7500 series, 2500 series, 7200 series, 7400 series, 7300 series manual Rl/Cg, Ch/Ci

LEAD DEFINITIONS E-3

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			Table E-2.EIA RS-232D (V.28) LEADS/DEFINITIONS
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⎜ PIN		⎜	EIA	⎜	CCITT	⎜	LEAD DESCRIPTION	⎜
⎜		⎜		⎜		⎜		⎜
⎜ NO.		⎜	INTERCHANGE	⎜	EQUIVALENT	⎜	(FUNCTION)	⎜
⎜		⎜	CIRCUIT	⎜	CIRCUIT	⎜		⎜
⎜	1	⎜	—	⎜	—	⎜ Shield		⎜
⎜	2	⎜	BA	⎜	103	⎜	Transmitted Data	⎜
⎜	3	⎜	BB	⎜	104	⎜	Received Data	⎜
⎜		⎜		⎜		⎜		⎜
⎜	4	⎜	CA	⎜	105	⎜	Request to Send	⎜
⎜	5	⎜	CB	⎜	106	⎜ Clear to Send		⎜
⎜	6	⎜	CC	⎜	107	⎜ DCE Ready		⎜
⎜	7	⎜	AB	⎜	102	⎜	Signal Ground/Common Ground	⎜
⎜	8	⎜	CF	⎜	109	⎜	Received Line Signal Detected	⎜
⎜		⎜		⎜		⎜		⎜
⎜	9	⎜	—	⎜	—	⎜	Reserved for Testing,	⎜
⎜		⎜		⎜		⎜ (+P) Transmit Current Loop Data		⎜
⎜ 10		⎜	—	⎜	—	⎜ Reserved for Testing		⎜
⎜	11	⎜	—	⎜	—	⎜	Unassigned	⎜
⎜	12	⎜	SCF	⎜	122	⎜	Secondary Received Line Signal	⎜
⎜		⎜		⎜		⎜		⎜
⎜		⎜		⎜		⎜	Detect—(Speed Mode Indication)	⎜
⎜ 13		⎜	SCB	⎜	121	⎜ Secondary Clear to Send		⎜
⎜ 14		⎜	SBA	⎜	118	⎜ Secondary Transmitted Data		⎜
⎜	15	⎜	DB	⎜	114	⎜	Transmitter Signal Element Timing	⎜
⎜		⎜		⎜		⎜	(DCE Source)	⎜
⎜		⎜		⎜		⎜		⎜
⎜	16	⎜	SBB	⎜	119	⎜	Secondary Received Data	⎜
⎜ 17		⎜	DD	⎜	115	⎜ Receiver Signal Element Timing		⎜
⎜		⎜		⎜		⎜ (DCE Source)		⎜
⎜	18	⎜	LL	⎜	—	⎜	Local Loopback	⎜
⎜	19	⎜	SCA	⎜	120	⎜	Secondary Request to Send	⎜
⎜		⎜		⎜		⎜		⎜
⎜	20	⎜	CD	⎜	108/2	⎜	DTE Ready	⎜
⎜ 21		⎜	RL/CG	⎜	140/110	⎜ Remote Loopback/Signal Quality Detector ⎜
⎜ 22		⎜	CE	⎜	125	⎜ Ring Indicator		⎜
⎜	23	⎜	CH/CI	⎜	111/112	⎜	Data Signal Rate Selector	⎜
⎜		⎜		⎜		⎜	(DTE/DCE Source)	⎜
⎜		⎜		⎜		⎜		⎜
⎜	24	⎜	DA	⎜	113	⎜	Transmitter Signal Element Timing	⎜
⎜ 25		⎜	TM	⎜		⎜ Test Mode		⎜