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Table of Contents
80-99208-1 Rev. D v
IP Addressing for the GSP-1620 Modem ...............................5-23
Dynamic IP Addressing ....................................................5-23
Fixed IP Addressing .........................................................5-24
Finding IP Addresses ........................................................5-24
Virtual Private Network Service .....................................5-24
Dormant Mode Service ...........................................................5-25
Mobile-Originated Packet Data Calls ....................................5-27
Mobile-Terminated Packet Data Calls ..................................5-27
Answering Calls Using the Data Port Only ....................5-28
Answering Calls Using the Data and Control Ports .......5-29
Roaming and Packet Data Service ........................................5-29
Using Asynchronous Data ....................................................................... 5-30
Data Rate and Throughput ....................................................5-32
Mobile-Originated Asynchronous Data Calls ........................5-32
Mobile-Terminated Asynchronous Data Calls ......................5-33
Accessing Packet Data Over an Asynchronous
Connection ...............................................................................5-34
Roaming and Asynchronous Data Service ............................5-35
Typical Modem Initialization Strings ..................................................... 5-36
AT Command Reference ........................................................................6-1
AT Command Quick Reference Tables...................................................... 6-2
AT Commands Overview ........................................................................... 6-7
Command Alphabet ..................................................................6-7
Case Sensitivity ........................................................................6-7
Command Line Format ............................................................6-7
Command Syntax .....................................................................6-8
Basic AT Commands .................................................................................. 6-8
Results Returned ......................................................................6-9
Command Echo (E) ...................................................................6-9
Get Info (I) .................................................................................6-9
Monitor Speaker Loudness (L) ...............................................6-10
Monitor Speaker Mode (M) ....................................................6-11
Select Pulse Dialing (P) ..........................................................6-11
Result Code Suppression (Q) ..................................................6-12
Select Tone Dialing (T) ...........................................................6-13
DCE Response Format (V) .....................................................6-13
Result Code Selection Command (X) .....................................6-14
Reset to Default Configuration (Z) ........................................6-15