Integrator’s Reference Manual

Table 5-3. Port Arbitration Behavior

Control

Data Port

Port Behavior

Port Active

Active

 

 

 

 

 

No

No

Control and Data ports are inactive and modem is powered

 

 

down unless the Diagnostic port is active.

 

 

 

No

Yes

The Data port processes all data and AT commands,

 

 

including the following:

 

 

■ Online-Command mode is supported on the Data port.

 

 

■ All port configuration commands apply to the Data port

 

 

 

as defined in Port(s) Affected by AT Commands on page

 

 

 

5-13.

 

 

■ If a non-data call (e.g., Markov, Loopback) is already

 

 

 

active when a call is attempted with the ATD command,

 

 

 

the BUSY result is returned. If a data call is active, a NO

 

 

 

DIALTONE result is returned.

 

 

■ DTR cannot be used to terminate a call or enter

 

 

 

Online-Command state (AT&D2 or AT&D1

 

 

 

configurations), unless the Diagnostic port is active.

 

 

 

Note: This is because the modem powers down if all

 

 

 

DTRs are low. DTR can be used to terminate the call or

 

 

 

enter Online-Command mode, although the modem will

 

 

 

power down after approximately 1 second.

 

 

 

Yes

No

All AT commands are processed on the Control port. Data

 

 

calls are not supported because the Data port is inactive.

 

 

■ All data calls initiated using the ATD command return

 

 

 

NO DIALTONE.

 

 

■

ATD<phone number> returns NO DIALTONE.

 

 

■ The ATD command with #627568 (Markov test call) or

 

 

 

#56672225 (Loopback test call) dial strings initiates a

 

 

 

call if a call is not already active. If a call is already

 

 

 

active when the call is attempted, a BUSY result is

 

 

 

returned.

 

 

■ Port configuration commands apply to the Data port

 

 

 

and Control port as defined in Port(s) Affected by AT

 

 

 

Commands on page 5-13.

 

 

■ The online escape sequence “+++” surrounded by guard

 

 

 

time is ignored.

 

 

■ Online-Command mode command ATH returns OK.

 

 

 

ATH will terminate an active test call.

 

 

■

Online-Command ATO returns NO CARRIER.

 

 

 

 

5-10

80-99208-1 Rev. D

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Qualcomm GSP-1620 Integrator’s Reference Manual Port Arbitration Behavior, Control Data Port Port Behavior Port Active
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GSP-1620 specifications

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