T-ISP-027 · Optical Degradation Detector

Read transceiver DOM telemetry (Rx/Tx power, temperature, bias current) per interface, compare against vendor thresholds and historical baseline, and flag fibers trending toward failure.

Cisco IOS-XR

Juniper Junos

Arista EOS

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Capabilities

DOM Rx/Tx power read
Vendor threshold compare
Baseline trend delta
Temp/bias check
Pre-failure flagging
JSON report

Required inputs

Parameters the script accepts. Defaults shown; some are vendor- or context-gated.

Parameter	Type	Default	Notes
Rx low warn (dBm) rx_low_dbm	number	-14	—
Trend drop warn (dB) trend_drop_db	number	3	—

Hint 1 — Name your vendors and OS versions

Mention the exact platforms you run (Cisco IOS-XR, Juniper Junos, Arista EOS) so the generated isp & peering logic uses the right CLI/NETCONF syntax.

Hint 2 — State your real thresholds

Provide concrete values for Rx low warn (dBm), Trend drop warn (dB) instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can dOM Rx/Tx power read and vendor threshold compare. Ask for the subset relevant to your incident to keep output focused.

Hint 4 — Describe your inventory format

Tell the assistant whether your device list is CSV, YAML, or JSON and which columns it has, so parsing matches your data.

Sample inventory schema

Authoritative shape of the device/policy data this script consumes.

No bundled inventory sample. The script accepts standard device lists (CSV/YAML) with hostname, mgmt IP, vendor, and credentials.

Expected output

Reference terminal output the script should produce — used as a stylistic and structural target.

terminal

2026-06-15 20:00:00 INFO  Evaluated 312 transceivers across 47 devices
2026-06-15 20:00:00 WARN  core-rtr-01 Hu0/0/0/3: Rx -15.8dBm (< -14 threshold)
2026-06-15 20:00:00 WARN  pe-rtr-04 Te0/1/2: Rx dropped 3.6dB vs baseline
2026-06-15 20:00:00 INFO  Report written to optical-health.json (2 degrading)