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COMSPHERE 3900 Series Modems
5-12 September 1998 3910-A2-GN32-40
Table 5-1
(3 of 10)
DTE Interface Configuration Options
DTR Action: Ignore
Nxt Ignore Stndrd_RS232 CntrlsOnHook CntrlsTxMute
Data Terminal Ready Action. DTR is a signal from the DTE to the modem indicating that the DTE is
connected and ready for operation.
H Ignore
Modem assumes DTR is always ON. This is used when the DTE does not provide DTR.
H Standard RS232
Allows the DTE to control DTR to the modem as specified in EIA-232-D and ITU-T V.24
specifications. If this signal is not present, the modem will not answer or dial.
H Controls On-Hook
Required for applications in which the host processor must reset itself for the next session before
the current session is terminated. When selected, the modem does not disconnect from the VF
line during an active call until DTR is lowered by the attached DTE. This setting is ignored if the
modem is commanded to disconnect from its own front panel or by the COMSPHERE 6700 Series
Network Management System.
H Controls Transmitter Mute
Mutes the transmitter whenever DTR drops on the DTE interface. This selection can be used on
the answer side modem to force the originate modem to initiate a dial backup.
NOTE: If V.25bis mode is used, then this configuration option must be set to Stndrd_RS232. The DTE
must provide DTR to dial or answer a call.
NOTE: When operating over the dial network, this selection forces DTR Action to behave as CT108/2
(Data Terminal Ready). If DTE Dialer Type configuration option is set to DTR=Direct 1, then DTR
Action behaves as CT108/1 (Connect Data Set to Line).
NOTE: Only the Stndrd_RS232 setting is allowed in Austria.
The AT command for Ignore is &D0.
The AT commands for Standard RS232 are &D1 or &D2.
The AT command for CntrlsOnHook is &D4
The AT command for CntrlsTxMute is &D5.