Chapter 6 - S-Registers

S24

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

Unit:

50 mSec.

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 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.

Range:

0, 1 through 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 dropout time can be increased, up to a maximum of 25.5

 

seconds. The S25 unit value for zero is the default value of 50 mSec. For values

 

from 1 through 255, the unit value is 100 mSec.

S26

Failed Password Attempts

Unit:

1 failed attempt

Range:

0-255

Default:

0

Description:

S26 counts the number of times there has been a failed password attempt. For

 

example, if you entered ATS26? the message 003 would be displayed, meaning

 

someone has failed three times to gain access to your modem using its password

 

security system.

S29

Local Inactivity Timer

Unit:

minutes

Range:

1-255

Default:

20

Description:

S29 defines the amount of idle time that can elapse between AT commands after the

 

SETUP password has been entered. If this timer expires, the LOGIN and SETUP

 

passwords will have to be re-entered. S29 only takes effect when the modem has

 

been sent a #DB1 command, which secures the modem from local and remote

 

configuration or dialing (i.e., no AT commands can be sent until the LOGIN and

 

SETUP passwords have been entered).

Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide

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Multi-Tech Systems MT2834BA, MT2834BL manual S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD, S25 DTR Dropout Time