Confidential
USERS MANUAL
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D
to as dual-stack async in CDMA parlance). The packets received at the mobile (from the connecting
laptop) are forwarded to the internet inter-working function at the IP level of the stack.
•
QNC is not a true packet data call because a dormant mode of operation is not supported For example,
this connection is always considered fully attached to the network (in this manner it is more like a circuit
switched connection).
The air interface is still async data on a dedicated traffic channel but a user will not see any difference from a
packet data communication session. The PPP communication is between the CM52 and the host application,
but to a user it could just as well be between the host application and the internet application.
3.7.3 1xRTT
1xRTT (HSPD or High Speed Packet Data) is referred to as the “real” packet data communication. There is no
dedicated traffic channel. There is a shared packet data channel upon which several users are sending
packets. The interface between CM52 and the host application is PPP, just as it was in the QNC case, but the
air interface is different.
Both Simple IP and Mobile IP are 1xRTT services. The implementation of both may vary from carrier to carrier.
Currently, the module supports Simple IP and Mobile IP in accordance to Verizon’s specifications.
3.7.3.1
Verizon’s Retry Logic During Service Option 33 Access Attempts
It is the strong desire of Verizon Wireless to limit the number of ineffective call attempts encountered by the
network. The number of allowable access attempts will depend on several factors including the type of
application and the nature of the error encountered by the device.
Verizon requires that when establishing a data call, the module performs data retries internally in accordance
to Verizon’s data retry strategy. Refer to Verizon documentation (Reqs-1XRTTDataServices.doc) for details
that describe the exact implementation.
The application is responsible for ensuring that manual retries are in accordance with the Verizon data retry
strategy. Please refer to Verizon documentation (Reqs-1XRTTDataServices.doc) for more information.
3.7.4 Data
Rates
The following CDMA data service options are supported:
CDMA Data Service
Service Option
Rate
Async Data
4
9600
Async Data
4100
Default Rate set 1
Async Data
12
Default rate set 2
Low Speed Packet Data
7
Default Rate set 1
Low Speed Packet Data
4103
Rate Set 1 (default) or Rate Set 2
Low Speed Packet Data
15
Default Rate set 2
High Speed Packet Data
22
Default Rate set 1
High Speed Packet Data
25
Rate set 2
1x High Speed Packet
Data
33
Up to 153 kbps
Note: Rate Set 1: (9600, 4800, 2400, 1200), over the air link rate is up to 9600 bps
Rate Set 2: (14400, 7200, 3600, 1800), over the air link rate is up to 14400 bps
