diff --git a/agent/device/sim/vendor.cc b/agent/device/sim/vendor.cc
index 86836ff..7e68606 100644
--- a/agent/device/sim/vendor.cc
+++ b/agent/device/sim/vendor.cc
@@ -18,4 +18,4 @@
 
 void vendor_init()
 {
-}
+}
\ No newline at end of file
diff --git a/agent/device/sim/vendor.h b/agent/device/sim/vendor.h
index 1dbc9cd..3fab2a6 100644
--- a/agent/device/sim/vendor.h
+++ b/agent/device/sim/vendor.h
@@ -16,6 +16,9 @@
 
 #ifndef __VENDOR_H__
 #define __VENDOR_H__
+
+#include "device.h"
+
 #define VENDOR_ID "ONF"
 #define SIM
 #define MODEL_ID  "sim"
@@ -44,4 +47,63 @@
 
 #define MAC_DEVICE_ACTIVATION_DELAY 200000 // in microseconds
 
+#define DEFAULT_MAC_SYSTEM_MODE BCMOLT_SYSTEM_MODE_GPON__16_X
+//#define DEFAULT_MAC_SYSTEM_MODE BCMOLT_SYSTEM_MODE_XGS__2_X
+#define DEFAULT_PON_MODE BCMOLT_PON_TYPE_GPON
+// #define DEFAULT_PON_MODE BCMOLT_PON_TYPE_XGPON
+
+
+///////////////////////////////////////////////////////
+// Constants relevant for decoding PON Trx EEPROM Data
+
+#define DYNAMIC_PON_TRX_SUPPORT
+
+#define TOTAL_PON_TRX_PORTS 16 // total PON transceiver ports
+#define TOTAL_PON_PORTS 16 // total PON ports (we could have up to 2 PON ports on the OLT MAC mapped to the external PON Trx)
+const int trx_port_to_pon_port_map[TOTAL_PON_TRX_PORTS][TOTAL_PON_PORTS/TOTAL_PON_TRX_PORTS]={{0},{1},{2},{3},{4},{5},{6},{7},{8},{9},{10},
+{11},{12},{13},{14},{15}};
+#define PONS_PER_TRX (TOTAL_PON_TRX_PORTS/TOTAL_PON_PORTS) // if there are more than one OLT MAC device,
+                                                           // they all have to be of the same type for this to work.
+
+const int bus_index[TOTAL_PON_TRX_PORTS] = {
+   47,  48,  37,  38,  35,  36,  33,  34,
+   39,  40,  41,  42,  43,  44,  45,  46
+};
+
+#define PORT_ADDRESS 50
+
+#define NAME_EEPROM "sfp_eeprom"
+
+#define EEPROM_VENDOR_NAME_START_IDX 148
+#define EEPROM_VENDOR_NAME_LENGTH 16
+
+#define EEPROM_VENDOR_OUI_START_IDX 165
+#define EEPROM_VENDOR_OUI_LENGTH 3
+
+#define EEPROM_VENDOR_PART_NUMBER_START_IDX 168
+#define EEPROM_VENDOR_PART_NUMBER_LENGTH 16
+
+#define EEPROM_VENDOR_REVISION_START_IDX 184
+#define EEPROM_VENDOR_REVISION_LENGTH 2
+
+#define EEPROM_DOWNSTREAM_WAVELENGTH_START_IDX 186
+#define EEPROM_DOWNSTREAM_WAVELENGTH_LENGTH 2
+#define EEPROM_WAVELENGTH_RESOLUTION 0.05
+
+// Define valid values below in case of Combo PON Trx is supported
+// #define EEPROM_DOWNSTREAM_SECONDARY_WAVELENGTH_START_IDX 120
+// #define EEPROM_DOWNSTREAM_SECONDARY_WAVELENGTH_LENGTH 2
+
+///////////////////////////////////////////////////////
+
+
+class PonTrx: public PonTrxBase {
+   public:
+      // override the base member functions if you need a different implementation
+      PonTrx(): PonTrxBase("sfp_eeprom", 50, "%d-00%d/%s") {
+
+      }
+
+};
+
 #endif