diff --git a/xos/synchronizer/models/models.py b/xos/synchronizer/models/models.py
index 643b5d3..5114871 100644
--- a/xos/synchronizer/models/models.py
+++ b/xos/synchronizer/models/models.py
@@ -26,6 +26,7 @@
 from models_decl import ANIPort_decl, ANIPort
 from models_decl import UNIPort_decl, UNIPort
 from models_decl import TechnologyProfile_decl
+from django.core.exceptions import ObjectDoesNotExist
 
 import json
 
@@ -41,6 +42,36 @@
         except IndexError, e:
             return False
 
+    def get_olt_technology_from_unu_sn(self, onu_sn):
+        """
+        Return the technology assigned to an OLT Device given and ONU Serial Number
+        example usage:
+            volt = VOLTService.objects.first()
+            sn = volt.get_olt_technology_from_unu_sn("BRCM12345678")
+            # "XGSPON"
+
+        Arguments:
+            onu_sn {string} -- The ONU Serial Number
+
+        Returns:
+            string -- Technology
+        """
+        try:
+            onu = ONUDevice.objects.get(serial_number=onu_sn)
+            olt = onu.pon_port.olt_device
+            return olt.technology
+        except ObjectDoesNotExist:
+            raise XOSNotFound("Can't find OLT for %s" % onu_sn, serial_number=onu_sn)
+
+    def get_tech_profile(self, technology, profile_id):
+        """
+        Returns a Technology profiles or raise an Exception (DoesNotExist)
+        :param technology: string
+        :param profile_id: int
+        :return: TechnologyProfile
+        """
+        return TechnologyProfile.objects.get(technology=technology, profile_id=profile_id)
+
 class OLTDevice(OLTDevice_decl):
     class Meta:
         proxy = True
diff --git a/xos/synchronizer/models/volt.xproto b/xos/synchronizer/models/volt.xproto
index 5abdf6f..cabf0c2 100644
--- a/xos/synchronizer/models/volt.xproto
+++ b/xos/synchronizer/models/volt.xproto
@@ -101,6 +101,14 @@
     optional string nas_id = 20 [
         help_text = "Authentication ID (propagated to the free-radius server via sadis)",
         max_length = 256];
+
+    required string technology = 22 [
+        help_text = "The technology being utilized by the adapter",
+        db_index = True,
+        tosca_key = True,
+        max_length = 16,
+        choices = "(('gpon', 'gpon'), ('xgspon', 'xgspon'))",
+        default = "xgspon"];
 }
 
 message PortBase (XOSBase){
@@ -116,12 +124,10 @@
 
     optional string admin_state = 4 [
         help_text = "admin state, whether port should be enabled",
-        // TODO: Should specify "choices"
         feedback_state = True,
         max_length = 32];
     optional string oper_status = 5 [
         help_text = "operational status, whether port is active",
-        // TODO: Should specify "choices"
         feedback_state = True,
         max_length = 32];
 }
@@ -237,7 +243,9 @@
         db_index = True,
         tosca_key = True,
         min_value = 64,
-        max_value = 255];
+        max_value = 255,
+        unique_with = "technology"];
+
     required string profile_value = 3 [
         help_text = "The technology profile value in JSON format",
         max_length = 4096];