diff --git a/roles/check_demarcation_point/tasks/checks.yaml b/roles/check_demarcation_point/tasks/checks.yaml
index 66dfc00818d567b9131c1e05decad655452e0208..ea9820ab4084c25d719e8ef936393a776e9085c0 100644
--- a/roles/check_demarcation_point/tasks/checks.yaml
+++ b/roles/check_demarcation_point/tasks/checks.yaml
@@ -55,10 +55,10 @@
 - name: Check the interface PCS statistics
   ansible.builtin.assert:
     that:
-      - "{{ verb }}.{{ check_id }}.ethernet_pcs_statistics_bit_error_secs <= {{ pcs_bit_error_seconds_threshold }}"
-      - "{{ verb }}.{{ check_id }}.ethernet_pcs_statistics_errored_blocks_secs <= {{ pcs_bit_error_blocks_seconds_threshold }}"
+      - "{{ verb }}.{{ check_id }}.ethernet_pcs_statistics_bit_error_secs | int <= {{ pcs_bit_error_seconds_threshold }}"
+      - "{{ verb }}.{{ check_id }}.ethernet_pcs_statistics_errored_blocks_secs | int <= {{ pcs_bit_error_blocks_seconds_threshold }}"
     fail_msg: "FAIL: PCS statistics errors detected"
-    success_msg: "PASS: PCS statistics errors detected"
+    success_msg: "PASS: PCS statistics errors are below threshold"
   failed_when: false
 
 - name: Check the optical levels output Tx power low threshold (dBm)
diff --git a/roles/check_demarcation_point/tasks/compare.yaml b/roles/check_demarcation_point/tasks/compare.yaml
index e378f71f271de8835760c06e53d19faf2e16bebe..4d80857c92fa6f54d10f906975e7e38093f1f737 100644
--- a/roles/check_demarcation_point/tasks/compare.yaml
+++ b/roles/check_demarcation_point/tasks/compare.yaml
@@ -77,3 +77,35 @@
     - pre_check[check_id] is defined
     - post_check[check_id] is defined
     - file_status.stat.exists
+
+- name: Check if Rx power in POST check is way lower than PRE check (above permitted threshold)
+  ansible.builtin.assert:
+    that:
+      - "{{ rx_power_dbm_diff | float }} > {{ rx_power_allowed_diff | float }} "
+    fail_msg: "WARNING: Rx Power (dBm) diff between pre/post check is bigger than allowed threshold."
+    success_msg: "PASS: Rx Power (dBm) diff between pre/post check is normal."
+  failed_when: false
+
+- name: Check if Tx power in POST check is way lower than PRE check (above permitted threshold)
+  ansible.builtin.assert:
+    that:
+      - "{{ tx_power_dbm_diff | float }} > {{ tx_power_allowed_diff | float }} "
+    fail_msg: "WARNING: Rx Power (dBm) diff between pre/post check is bigger than allowed threshold."
+    success_msg: "PASS: Rx Power (dBm) diff between pre/post check is normal."
+  failed_when: false
+
+- name: Check if input_errors increase diff between PRE and POST checks is above permitted threshold
+  ansible.builtin.assert:
+    that:
+      - "{{ input_error_count_diff | int }} < {{ input_error_count_threshold | int }} "
+    fail_msg: "WARNING: Input errors count in POST check have been increased above threshold."
+    success_msg: "PASS: Input errors count diffs between PRE and POST check is normal."
+  failed_when: false
+
+- name: Check if output_errors increase diff between PRE and POST checks is above permitted threshold
+  ansible.builtin.assert:
+    that:
+      - "{{ output_error_count_diff | int }} < {{ output_error_count_threshold | int }} "
+    fail_msg: "WARNING: Output errors count in POST check have been increased above threshold."
+    success_msg: "PASS: ASS: Output errors count diffs between PRE and POST check is normal."
+  failed_when: false
\ No newline at end of file
diff --git a/roles/check_demarcation_point/vars/optical_thresholds.yml b/roles/check_demarcation_point/vars/optical_thresholds.yml
index 2c496bca622339ceac7b5aac8ae2a8ad2f12c507..0c81c198ad197e44730035c528c2e4dafcd2bf1a 100644
--- a/roles/check_demarcation_point/vars/optical_thresholds.yml
+++ b/roles/check_demarcation_point/vars/optical_thresholds.yml
@@ -3,6 +3,8 @@ min_tx_power_dbm: -8
 max_tx_power_dbm: 0
 min_rx_power_dbm: -10
 max_rx_power_dbm: -0.5
+rx_power_allowed_diff: -2
+tx_power_allowed_diff: -2
 input_error_count_threshold: 3
 output_error_count_threshold: 3
 fec_ccw_count_threshold: 0
@@ -10,4 +12,4 @@ fec_ccw_error_rate_threshold: 0
 fec_nccw_count_threshold: 0
 fec_nccw_error_rate_threshold: 0
 pcs_bit_error_seconds_threshold: 20
-pcs_bit_error_blocks_seconds_threshold: 20
+pcs_bit_error_blocks_seconds_threshold: 20
\ No newline at end of file