This section is only applicable to the lab application.
The data channel function allows you to use the test set as an IP router, exchanging packet data between an external network and a cdma2000 wireless device with an Service Option 33 (SO33 or SO33 (+F-SCH), see Packet Data Service Options ) high speed packet data service connection.
The test set supports simple IP protocol with it's internal PDSN simulation. By working together with an external Mobile IP Simulator (MOB-IP-SIM) provided by the Software Concepts, Inc., the test set supports the mobile IP protocol tests (see Simple IP and Mobile IP ). IP data can be routed through an Ethernet port to/from a wireless device on the RF port, or the test set can serve files without requiring an external network. See Packet Data Service Example Procedure (via Simple IP) or Packet Data Service Example Procedure (via Mobile IP) for example procedures.
The data channel function is useful when the performance of applications such as music download, interactive and multimedia applications (see Data Channel Applications ) needs to be tested in a controlled environment. You can use tools such as Data Counters , Data Throughput Monitor or Wireless Protocol Advisor (WPA) software to monitor the effects of RF degradation on data transfer. The data rate can be changed while on a call (see Data Channel Parameters ). Cell power can be adjusted to simulate poor channel conditions and an AWGN (Additive White Gaussian Noise) noise source (see Configuring Cell Power and AWGN Power Levels ) can be added to the signal to simulate signal interference. The supplemental channel is also directly settable to a level relative to cell power ( Configuring Forward Channel Power Levels and Walsh Codes ). Lowering the power level on the forward supplemental channel will interrupt data flow, especially at the higher data rates.
Effects of data rate variations include unacceptably long file downloads, graphics images that take too long to display, and streaming video images freezing. Lost data stresses the mobile station application's ability to run correctly when there are long delays due to retransmission of data (observed via Data Counters ). Delayed data stresses the mobile stations' ability to buffer data while waiting for late packets to arrive.
The test set also provides a Ping tool to help check system interconnects.
To verify the current status of packet data connection, see Packet Data Connection Processing States .