Specifications

Defining Operating Parameters
5-15
DTR Control
This parameter specifies whether the DTR signal is controlled by the DTE or held in a
constant On condition. DTR is the "master enable" for all DTE control signals (RTS,
CTS, etc.). When Constant is selected, the DAP ignores the DTR signal from the DTE
and holds it constant. When DTE is selected, the DTR signal is controlled by the DTE.
CTS Control
This parameter allows you to set the unit's CTS signal. When RTS On is selected, the
CTS signal is generated only if the RTS signal is active and the unit can accept data for
transmission. When the circuit assurance option (DDS Up) is selected, the DAP does not
provide CTS in response to RTS if any of the following fault conditions occur:
• The DAP is not detecting a valid network or multiport framing pattern in the
received data.
• The DAP is receiving an Out-of-Service code from the DDS network indicating a
failure within the network.
• The DAP is receiving an Abnormal Station code indicating a problem with a
remote station.
• The DAP is detecting an invalid receive signal.
RTS Simulation
This parameter specifies the RTS Simulation method in the DDSNI, CC64, and C64NI
modes. In the other modes of operation, RTS controls DCD without the need for
simulation. See the following description under "DCD Simulation."
DCD Simulation
This parameter specifies the DCD Simulation method in the DDSNI, CC64, and C64NI
modes. In the other modes of operation, RTS controls DCD without the need for
simulation. The RTS and DCD Simulation parameters are used in applications where the
DTE needs to see a DCD change of state. These parameters are used in conjunction with
one another; i.e., if RTS Simulation is enabled at one end of the circuit, DCD Simulation
must be enabled at the other end of the circuit. Three options are available:
• Disabled - RTS-DCD Simulation is disabled.