Black Box MD1641A S19 Dial-Back Timer 336+ Only, S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD

SERIES II INTELLIGENT DATA/FAX MODEMS

S19

Dial-Back Timer (336+ Only)

Unit:	Minutes
Range:	0-255
Default:	1
Description:	In the Series II Modem 336+ (MD1640A), S19
	is a timer that begins when the lease line goes
	down. S19 specifies the duration of time the
	modem attempts to reestablish the lease line
	connection.

S24

PBX/CBX Disconnect Drop Time for DSR/CTS/CD

Unit:	50-mSec intervals
Range:	0-255
Default:	20
Description:	Some PBX and CBX phone systems require the
	modem’s DSR, CTS, and/or CD signal(s) to
	behave in a certain manner when calls are
	disconnected. The Series II Modem’s &R, &S,
	and &C commands cause the modem to drop
	these signal(s) for a specified time period upon
	disconnect, and then bring the signal(s) up
	again. S24 defines the length of time that the
	signals drop. The default setting of 20 results in
	a one-second drop time, which is what most
	PBX/CBX systems with this requirement need.

S25

DTR Dropout Time

Unit:	100-mSec intervals
Range:	0 (50 mSec), 1-255
Default:	0
Description:	S25 defines the amount of time that DTR must
	be dropped before the modem disconnects.
	Typically, a disconnect occurs when DTR is
	dropped for 50 milliseconds or more. This

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