diff --git a/cellular/src/amps.rs b/cellular/src/amps.rs
new file mode 100644
index 0000000..312194f
--- /dev/null
+++ b/cellular/src/amps.rs
@@ -0,0 +1,28 @@
+enum DSPMode {
+    OFF,  // Channel not active
+    AUDIO_RX_AUDIO_TX, // stream audio
+    AUDIO_RX_FRAME_TX, // stream audio and send frames
+    AUDIO_RX_SILENCE_TX, // stream audio and send silence
+    FRAME_RX_FRAME_TX, // send and receive frames
+}
+
+enum AMPSChannelType {
+    CC, // control channel
+    PC, // paging channel
+    CC_PC, // combined control+paging
+    VC, // voice channel
+    CC_PC_VC, // combined control+paging+voice
+}
+
+enum AMPSState {
+    NULL, // power off
+    IDLE, // channel not in use
+    BUSY, // channel busy (call in progress)
+}
+
+enum FSK_RX_Sync {
+    NONE, // not in sync, waiting for valid dotting sequence
+    DOTTING, // received a valid dotting sequence, check for sync sequence
+    POSITIVE, // valid sync, read all bits from the frame
+    NEGATIVE, // negative sync (high frequency deviation detected as low signal)
+}
\ No newline at end of file
diff --git a/cellular/src/main.rs b/cellular/src/main.rs
index d8889cb..11ae420 100644
--- a/cellular/src/main.rs
+++ b/cellular/src/main.rs
@@ -2,7 +2,7 @@ use ferris_says::say;
 use std::io::{stdout, BufWriter};
 
 mod sdr;
-
+mod amps;
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let stdout = stdout();
     let message = String::from("Welcome to the Cellular Revolution!");