Control Signals - Alcatel MainStreet 2902 Manual

19.7

Control signals

Control signals provide the handshaking required for call setup, call tear-down and
synchronization. Control signals can be configured as:
•
high (ON)
•
low (OFF)
•
end to end (END_TO_END)
End-to-end means the state of the local signal follows that of the signal source at the
remote end of the network. This option is only available when HCM rate adaption is
used.
Table 19-1 shows the default control signals settings. If the device is configured as
synchronous, DTR and DSR are not functional for V.35 DCMs.
2902 MainStreet Technical Practices
May 2002 90-2906-01
Control signals are the only interface parameter that can be
Note —
set for a circuit that is configured as a timing source. It is also the only
interface parameter that can be changed when a circuit is connected.
Table 19-1 X.21 and V.35 DCM control signal defaults
Operating mode Inputs
X.21 module
DTE I
DCE C
V.25 module
DTE DCD
DCE RTS
Outputs
END_TO_END C
END_TO_END I
END_TO_END RTS
ALB
END_TO_END DCD
CTS
19 — X.21 and V.35 DCMs
END_TO_END
END_TO_END
END_TO_END
END_TO_END
19-7