diff --git a/eive_tmtc/tmtc/com/subsystem.py b/eive_tmtc/tmtc/com/subsystem.py
index 3f73dac..2f7e343 100644
--- a/eive_tmtc/tmtc/com/subsystem.py
+++ b/eive_tmtc/tmtc/com/subsystem.py
@@ -22,6 +22,7 @@ class Submode(enum.IntEnum):
 
 class OpCode:
     RX_ONLY = "rx_only"
+    TX_AND_RX_DEF_RATE = "rx_and_tx_default_rate"
     TX_AND_RX_LOW_RATE = "rx_and_tx_low_rate"
     TX_AND_RX_HIGH_RATE = "rx_and_tx_high_rate"
     TX_AND_RX_CARRIER_WAVE = "rx_and_tx_carrier_wave"
@@ -29,6 +30,7 @@ class OpCode:
 
 class Info:
     RX_ONLY = "Syrlinks RX Only"
+    TX_AND_RX_DEF_DATARATE = "Syrlinks with TX default datarate"
     TX_AND_RX_LOW_DATARATE = "Syrlinks with TX low datarate (BPSK modulation)"
     TX_AND_RX_HIGH_DATARATE = "Syrlinks with TX high datarate (0QPSK modulation)"
     TX_AND_RX_CARRIER_WAVE = "Syrlinks with TX carrier wave"
@@ -41,6 +43,11 @@ def build_com_subsystem_cmd(p: ServiceProviderParams):
     if o == OpCode.RX_ONLY:
         q.add_log_cmd(Info.RX_ONLY)
         q.add_pus_tc(create_mode_command(COM_SUBSYSTEM_ID, Submode.RX_ONLY, 0))
+    elif o == OpCode.TX_AND_RX_DEF_RATE:
+        q.add_log_cmd(Info.TX_AND_RX_DEF_DATARATE)
+        q.add_pus_tc(
+            create_mode_command(COM_SUBSYSTEM_ID, Submode.RX_AND_TX_DEF_DATARATE, 0)
+        )
     elif o == OpCode.TX_AND_RX_LOW_RATE:
         q.add_log_cmd(Info.TX_AND_RX_LOW_DATARATE)
         q.add_pus_tc(
@@ -64,4 +71,5 @@ def add_com_subsystem_cmds(defs: TmtcDefinitionWrapper):
     oce.add(OpCode.RX_ONLY, Info.RX_ONLY)
     oce.add(OpCode.TX_AND_RX_LOW_RATE, Info.TX_AND_RX_LOW_DATARATE)
     oce.add(OpCode.TX_AND_RX_HIGH_RATE, Info.TX_AND_RX_HIGH_DATARATE)
+    oce.add(OpCode.TX_AND_RX_DEF_RATE, Info.TX_AND_RX_DEF_DATARATE)
     defs.add_service(CustomServiceList.COM_SS, "COM Subsystem", oce)