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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