diff --git a/gnpy/core/network.py b/gnpy/core/network.py
index 3017d672f..2a0f0e80a 100644
--- a/gnpy/core/network.py
+++ b/gnpy/core/network.py
@@ -17,8 +17,7 @@
 from gnpy.core.exceptions import ConfigurationError, NetworkTopologyError
 from gnpy.core.utils import round2float, convert_length, psd2powerdbm, lin2db, watt2dbm, dbm2watt
 from gnpy.core.info import ReferenceCarrier, create_input_spectral_information
-from gnpy.tools import json_io
-from gnpy.core.parameters import SimParams
+from gnpy.core.parameters import SimParams, EdfaParams
 from gnpy.core.science_utils import RamanSolver
 
 
@@ -540,7 +539,7 @@ def add_roadm_booster(network, roadm):
         network.remove_edge(roadm, next_node)
         amp = elements.Edfa(
             uid=f'Edfa_booster_{roadm.uid}_to_{next_node.uid}',
-            params=json_io.Amp.default_values,
+            params=EdfaParams.default_values,
             metadata={
                 'location': {
                     'latitude': roadm.lat,
@@ -566,7 +565,7 @@ def add_roadm_preamp(network, roadm):
         network.remove_edge(prev_node, roadm)
         amp = elements.Edfa(
             uid=f'Edfa_preamp_{roadm.uid}_from_{prev_node.uid}',
-            params=json_io.Amp.default_values,
+            params=EdfaParams.default_values,
             metadata={
                 'location': {
                     'latitude': roadm.lat,
@@ -595,7 +594,7 @@ def add_inline_amplifier(network, fiber):
         network.remove_edge(fiber, next_node)
         amp = elements.Edfa(
             uid=f'Edfa_{fiber.uid}',
-            params=json_io.Amp.default_values,
+            params=EdfaParams.default_values,
             metadata={
                 'location': {
                     'latitude': (fiber.lat + next_node.lat) / 2,
diff --git a/gnpy/core/parameters.py b/gnpy/core/parameters.py
index 4e701af02..52fb3f2c1 100644
--- a/gnpy/core/parameters.py
+++ b/gnpy/core/parameters.py
@@ -398,6 +398,38 @@ def asdict(self):
 
 
 class EdfaParams:
+    default_values = {
+        'f_min': 191.3e12,
+        'f_max': 196.1e12,
+        'multi_band': None,
+        'bands': [],
+        'type_variety': '',
+        'type_def': '',
+        'gain_flatmax': None,
+        'gain_min': None,
+        'p_max': None,
+        'nf_model': None,
+        'dual_stage_model': None,
+        'preamp_variety': None,
+        'booster_variety': None,
+        'nf_min': None,
+        'nf_max': None,
+        'nf_coef': None,
+        'nf0': None,
+        'nf_fit_coeff': None,
+        'nf_ripple': 0,
+        'dgt': None,
+        'gain_ripple': 0,
+        'tilt_ripple': 0,
+        'f_ripple_ref': None,
+        'out_voa_auto': False,
+        'allowed_for_design': False,
+        'raman': False,
+        'pmd': 0,
+        'pdl': 0,
+        'advance_configurations_from_json': None
+    }
+
     def __init__(self, **params):
         try:
             self.type_variety = params['type_variety']
diff --git a/gnpy/tools/json_io.py b/gnpy/tools/json_io.py
index c55b26646..dbf30cb55 100644
--- a/gnpy/tools/json_io.py
+++ b/gnpy/tools/json_io.py
@@ -21,7 +21,7 @@
 from gnpy.core.science_utils import estimate_nf_model
 from gnpy.core.info import Carrier
 from gnpy.core.utils import automatic_nch, automatic_fmax, merge_amplifier_restrictions
-from gnpy.core.parameters import DEFAULT_RAMAN_COEFFICIENT
+from gnpy.core.parameters import DEFAULT_RAMAN_COEFFICIENT, EdfaParams
 from gnpy.topology.request import PathRequest, Disjunction, compute_spectrum_slot_vs_bandwidth
 from gnpy.topology.spectrum_assignment import mvalue_to_slots
 from gnpy.tools.convert import xls_to_json_data
@@ -180,35 +180,7 @@ class RamanFiber(Fiber):
 
 
 class Amp(_JsonThing):
-    default_values = {
-        'f_min': 191.35e12,
-        'f_max': 196.1e12,
-        'type_variety': '',
-        'type_def': '',
-        'gain_flatmax': None,
-        'gain_min': None,
-        'p_max': None,
-        'nf_model': None,
-        'dual_stage_model': None,
-        'preamp_variety': None,
-        'booster_variety': None,
-        'nf_min': None,
-        'nf_max': None,
-        'nf_coef': None,
-        'nf0': None,
-        'nf_fit_coeff': None,
-        'nf_ripple': 0,
-        'dgt': None,
-        'gain_ripple': 0,
-        'tilt_ripple': 0,
-        'f_ripple_ref': None,
-        'out_voa_auto': False,
-        'allowed_for_design': False,
-        'raman': False,
-        'pmd': 0,
-        'pdl': 0,
-        'advance_configurations_from_json': None
-    }
+    default_values = EdfaParams.default_values
 
     def __init__(self, **kwargs):
         self.update_attr(self.default_values, kwargs, 'Amp')