Motorola V.3600 manual 140

Installation

Table 2-1. Pin Signal Descriptions (Continued)

	EIA-	CCITT
Pin	232D	V.24	Signal	Description
11	--		Signal	This circuit indicates probability of
			Quality	errors in the received data: a positive
			Indicator	level indicates poor signal quality
				while a negative level indicates good
				signal quality. †
15	DB	114	Transmit	A transmit data rate clock output for
			Clock	use by an external data source: Positive
			(DCE)	clock transitions correspond to data
				transitions.
17	DD	115	Receive	A receive data rate clock output for use
			Clock	by an external data sink: Positive clock
				transitions correspond to data
				transitions.
18	--	141	Local	A positive level causes the modem to
			Loopback	enter the local analog loopback test
				mode.*
20	CD	108.2	Data	This circuit is positive when the DTE is
			Terminal	ready to originate or answer a call in
			Ready	dial-up operation. DTR must always be
				active (high) in 2-wire private line
				operation. Cycling DTR causes
				retraining.*
21	--	140	Remote	A positive level causes a digital
			Digital	loopback test mode at the remote
			Loopback	modem.*
22	CE	125	Ring Indi-	In direct dial operation this circuit is
			cator	positive in response to an incoming
				ring signal.*
23	CH	111	Data Rate	Supplies a data rate control input to
			Select	select primary or fallback data rate:
				Negative voltage selects primary data
				rate and positive voltage selects
				fallback data rate.*
24	DA	113	External	A serial data rate clock input from the
			Transmit	data source. Positive clock transitions
			Clock	correspond to data transitions.
25	--	142	Test Mode	Indicates the modem is in a test mode.

* Modem options may force these signals on or cause them to be ignored. ** Refer to Appendix C, Hardware Options.

† This function can be disabled or its logic sense reversed by hardware straps.

V.3600 2-5