Call Termination; Conditions That Terminate A Call; Cleardown - Black Box 325 User Manual

MODEM 325 AND MODEM 325 CARD

5.15 Call Termination

5.15.1 C T
ONDITIONS HAT
The following conditions cause call termination:
• Abort Disconnect
(No answer, busy
signal, no modem, etc.)
• ATH
• Loss of Carrier
Disconnect
• Receive Long
Space Disconnect
• DTR Disconnect
• LCD Display
• Protocol Link
Establishment
Failure
• Protocol Inactivity
Timeout
• Protocol Retry
Limit Exceeded
• Signal Quality
• Modem power is turned off.
5.15.2 V.32 C
LEARDOWN
V.32 cleardown is a method of call termination specified in the CCITT recommendation. The cleardown
method incorporates a training sequence which ends with a command to disconnect. If long-space
disconnect is disabled, the cleardown sequence is activated by the ATH2 command.
5 0
T A C
ERMINATE ALL
Default 30 sec. Selectable
1 to 30 sec.
Disconnect command.
Selectable 100 ms to
25.5 sec.
Selectable for disable
or 2 sec.
Selectable for disabled or
10 ms to 2.55 sec.
When TALK/DATA is
pressed LCD displays DO
YOU WANT TO GO TO
TALK? When YES is
pressed, the modem hangs up if
no phone is connected or if
the connected phone is not
off hook. Pressing NO
displays DO YOU WANT
TO DISCONNECT?
Pressing YES then
disconnects.
Reliable mode only.
Failure to establish
reliable link.
Default (0) disabled.
Software selectable for
disabled or 1 to 255
minutes.
12 retransmissions of the
frame.
Leased line operation with
dial backup enabled.
Extended loss of carrier or
4 unsuccessful retrains in
3 minutes.