Added Comcast Business - Cisco DPC3939B (#1135)

device-types/Cisco/DPC3939B.yaml

@@ -0,0 +1,26 @@
+---
+manufacturer: Cisco
+model: DPC3939B
+slug: cisco-dpc3939B
+part_number: DPC3939B
+u_height: 0
+is_full_depth: false
+comments: Comcast Business Gateway Model DPC3939B
+weight:
+  - value: 2.65
+    unit: lb
+power-ports:
+  - name: PS1
+    type: iec-60320-c8
+    maximum_draw: 17
+interfaces:
+  - name: Ethernet 1
+    type: 1000base-t
+  - name: Ethernet 2
+    type: 1000base-t
+  - name: Ethernet 3
+    type: 1000base-t
+  - name: Ethernet 4
+    type: 1000base-t
+  - name: Coax 1
+    type: docsis