diff --git a/src/frame.ts b/src/frame.ts
index 6e88b55..5e0457a 100644
--- a/src/frame.ts
+++ b/src/frame.ts
@@ -378,6 +378,13 @@ export class Frame implements IFrame {
       if (routingSection) {
         structure.push(routingSection);
       }
+      // Add data type identifier section
+      structure.push({
+        name: "data type",
+        data: new TextEncoder().encode(this.payload.charAt(0)).buffer,
+        isString: true,
+        fields: [{ type: FieldType.CHAR, name: "identifier", length: 1 }],
+      });
       if (payloadsegment) {
         structure.push(...payloadsegment);
       }
@@ -2306,34 +2313,34 @@ const parseFrame = (data: string): Frame => {
 
     pathFields.push({
       type: FieldType.CHAR,
-      name: `Path separator ${i}`,
+      name: `path separator ${i}`,
       length: 1,
     });
     pathFields.push({
       type: FieldType.STRING,
-      name: `Repeater ${i}`,
+      name: `repeater ${i}`,
       length: pathStr.length,
     });
   }
 
   const routingSection: Segment = {
-    name: "Routing",
-    data: encoder.encode(data.slice(0, routeSepIndex)).buffer,
+    name: "routing",
+    data: encoder.encode(data.slice(0, routeSepIndex + 1)).buffer,
     isString: true,
     fields: [
       {
         type: FieldType.STRING,
-        name: "Source address",
+        name: "source address",
         length: sourceStr.length,
       },
-      { type: FieldType.CHAR, name: "Route separator", length: 1 },
+      { type: FieldType.CHAR, name: "route separator", length: 1 },
       {
         type: FieldType.STRING,
-        name: "Destination address",
+        name: "destination address",
         length: destinationStr.length,
       },
       ...pathFields,
-      { type: FieldType.CHAR, name: "Payload separator", length: 1 },
+      { type: FieldType.CHAR, name: "payload separator", length: 1 },
     ],
   };
 
diff --git a/test/frame.capabilities.test.ts b/test/frame.capabilities.test.ts
index e16ff8f..a82d3fa 100644
--- a/test/frame.capabilities.test.ts
+++ b/test/frame.capabilities.test.ts
@@ -1,6 +1,10 @@
 import { describe, it, expect } from "vitest";
 import { Frame } from "../src/frame";
-import type { Payload, StationCapabilitiesPayload } from "../src/frame.types";
+import {
+  DataType,
+  type Payload,
+  type StationCapabilitiesPayload,
+} from "../src/frame.types";
 import { Dissected } from "@hamradio/packet";
 
 describe("Frame.decodeCapabilities", () => {
@@ -9,7 +13,7 @@ describe("Frame.decodeCapabilities", () => {
     const frame = Frame.fromString(data);
     const decoded = frame.decode() as StationCapabilitiesPayload;
     expect(decoded).not.toBeNull();
-    expect(decoded.type).toBe("capabilities");
+    expect(decoded.type).toBe(DataType.StationCapabilities);
     expect(Array.isArray(decoded.capabilities)).toBeTruthy();
     expect(decoded.capabilities).toContain("IGATE");
     expect(decoded.capabilities).toContain("MSG_CNT");
@@ -23,7 +27,7 @@ describe("Frame.decodeCapabilities", () => {
       structure: Dissected;
     };
     expect(res.payload).not.toBeNull();
-    if (res.payload && res.payload.type !== "capabilities")
+    if (res.payload && res.payload.type !== DataType.StationCapabilities)
       throw new Error("expected capabilities payload");
     expect(res.structure).toBeDefined();
     const caps = res.structure.find((s) => s.name === "capabilities");
diff --git a/test/frame.rawgps.test.ts b/test/frame.rawgps.test.ts
index a812a99..b42dbd2 100644
--- a/test/frame.rawgps.test.ts
+++ b/test/frame.rawgps.test.ts
@@ -1,6 +1,6 @@
 import { describe, it, expect } from "vitest";
 import { Frame } from "../src/frame";
-import type { RawGPSPayload } from "../src/frame.types";
+import { DataType, type RawGPSPayload } from "../src/frame.types";
 import { Dissected } from "@hamradio/packet";
 
 describe("Raw GPS decoding", () => {
@@ -13,7 +13,7 @@ describe("Raw GPS decoding", () => {
     const payload = f.decode(false) as RawGPSPayload | null;
 
     expect(payload).not.toBeNull();
-    expect(payload?.type).toBe("raw-gps");
+    expect(payload?.type).toBe(DataType.RawGPS);
     expect(payload?.sentence).toBe(sentence);
     expect(payload?.position).toBeDefined();
     expect(typeof payload?.position?.latitude).toBe("number");
@@ -32,7 +32,7 @@ describe("Raw GPS decoding", () => {
     };
 
     expect(result.payload).not.toBeNull();
-    expect(result.payload?.type).toBe("raw-gps");
+    expect(result.payload?.type).toBe(DataType.RawGPS);
     expect(result.payload?.sentence).toBe(sentence);
     expect(result.payload?.position).toBeDefined();
     expect(typeof result.payload?.position?.latitude).toBe("number");
diff --git a/test/frame.test.ts b/test/frame.test.ts
index 43aa3e5..16f4703 100644
--- a/test/frame.test.ts
+++ b/test/frame.test.ts
@@ -837,19 +837,19 @@ describe("Packet dissection with sections", () => {
     expect(result.structure).toBeDefined();
     expect(result.structure.length).toBeGreaterThan(0);
 
-    const routingSection = result.structure.find((s) => s.name === "Routing");
+    const routingSection = result.structure.find((s) => s.name === "routing");
     expect(routingSection).toBeDefined();
     expect(routingSection?.fields).toBeDefined();
     expect(routingSection?.fields?.length).toBeGreaterThan(0);
 
     const sourceField = routingSection?.fields?.find(
-      (a) => a.name === "Source address",
+      (a) => a.name === "source address",
     );
     expect(sourceField).toBeDefined();
     expect(sourceField?.length).toBeGreaterThan(0);
 
     const destField = routingSection?.fields?.find(
-      (a) => a.name === "Destination address",
+      (a) => a.name === "destination address",
     );
     expect(destField).toBeDefined();
     expect(destField?.length).toBeGreaterThan(0);
diff --git a/test/frame.userdefined.test.ts b/test/frame.userdefined.test.ts
index 195e2ad..4ca498f 100644
--- a/test/frame.userdefined.test.ts
+++ b/test/frame.userdefined.test.ts
@@ -1,7 +1,7 @@
 import { describe, it, expect } from "vitest";
 import { Dissected } from "@hamradio/packet";
 import { Frame } from "../src/frame";
-import type { UserDefinedPayload } from "../src/frame.types";
+import { DataType, type UserDefinedPayload } from "../src/frame.types";
 
 describe("Frame.decodeUserDefined", () => {
   it("parses packet type only", () => {
@@ -9,7 +9,7 @@ describe("Frame.decodeUserDefined", () => {
     const frame = Frame.fromString(data);
     const decoded = frame.decode() as UserDefinedPayload;
     expect(decoded).not.toBeNull();
-    expect(decoded.type).toBe("user-defined");
+    expect(decoded.type).toBe(DataType.UserDefined);
     expect(decoded.userPacketType).toBe("01");
     expect(decoded.data).toBe("");
   });
@@ -22,7 +22,7 @@ describe("Frame.decodeUserDefined", () => {
       structure: Dissected;
     };
     expect(res.payload).not.toBeNull();
-    expect(res.payload.type).toBe("user-defined");
+    expect(res.payload.type).toBe(DataType.UserDefined);
     expect(res.payload.userPacketType).toBe("TEX");
     expect(res.payload.data).toBe("Hello world");