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Modem Signal and Line States
Signal and Line State Diagrams
DC-160
Cisco IOS Dial Technologies Configuration Guide
Figure 26 EXEC Creation on a Line Configured for a High-Speed Modem
Supporting Dial-In and Dial-Out Connections
To configure a line for both incoming and outgoing calls, use the following command in line
configuration mode:
Figure 27 illustrates the modem inout command. If the line is activated by raising the data set ready
(DSR) signal, it functions exactly as a line configured with the modem dialin line configuration
command described in the section “Automatically Answering a Modem” earlier in this chapter. If the
line is activated by an incoming TCP connection, the line functions similarly to lines not used with
modems.
high,
watching
Lower DTR
Ringin
g
Idle state
Ready and active
Ring transition
CTS raised
DTR
CTS
Create EXEC
Raise DTR
Lower DTR
close connection
DTR high
CTS lowered
or exit
Answer
timeout
DTR low
H
ang up
S1001a
DTR low,
watching
CTS
Command Purpose
Router(config-line)# modem inout
Configures a line for both incoming and outgoing calls.