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Integrator’s Reference Manual

5-8 80-99208-1 Rev. D

The Um interface shown in Figure 5-2 is the dedicated

wireless traffic channel between the GSP-1620 modem (DCE)

and the Gateway Interworking Function (IWF).

Table 5-2 shows the signal lines for each port in Figure 5-2.

Note

The modem signal naming convention assumes that the modem is the

DCE and that the user application is the DTE.

Note

For a complete description of port hardware, including pinouts, see Data

and Control Ports on page 7-6.

Data and Control Port Configurations

For a data application, you can set up the modem to use

different configurations of the Data and Control ports:

• Data port only — AT commands can be sent to the

modem only when there is no data session active (i.e., no

data is coming across the port) or when a data session is

active but the Data port is in Online-Command mode.

Table 5-2. Port Signal Lines

Data Port Control Port

GND - Signal Common GND - Signal Common

TxD - Transmit Data TxD - Transmit Data

RxD - Receive Data RxD - Receive Data

DTR - Data Terminal Ready DTR - Data Terminal Ready

DSR - Data Set Ready DSR - Data Set Ready

RFR (RTS) - Ready for Receive

CTS - Clear To Send

RLSD (DCD) - Data Carrier

Detected

RI -Ring Indicator

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Qualcomm GSP-1620 Spezifikationen Seite 75