featureprofiles transceiver 5 delay

The Test400ZRTunableFrequency and related optical channel tests are experiencing intermittent failures with two main failure patterns: Statistical Validation Failures Optical-Channel: carrier-frequency-offset min: -1 greater than carrier-frequency-offset avg: -13 This error occurs when telemetry statistical values (min/max/avg) are inconsistent, due to:

Race conditions during telemetry collection Stale/cached telemetry data being used for validation Device updating statistical values non-atomically

Interface Timeout Failures context deadline exceeded This occurs when optical interfaces take longer than the configured timeout to come up after configuration changes. Root Causes:

The test collects telemetry immediately after configuration, but optical modules need time to stabilize their statistical measurements Insufficient Stabilization Time: 90-second timeout and 80-second stabilization delays are insufficient for optical channel convergence Floating-point precision issues in statistical comparisons

This PR implements a targeted fix addressing the specific failure patterns:

Enhanced Telemetry Stabilization

Increased timeout from 90 seconds to 3 minutes for optical interface convergence Increased stabilization delays after configuration changes (from 80s to 100s before validation) Extended telemetry wait time to allow statistical measurements to stabilize

Sample Flushing for Fresh Data

Flushes old/stale samples from telemetry streams before validation Validates data sanity before using telemetry for statistical comparisons Retry logic for telemetry collection with up to 3 attempts

Robust Statistical Validation

Proper floating-point handling with rounding to 1 decimal place Statistical tolerance (±0.1) for min/max/avg comparisons

Sep 25 '25 21:09 hmod2001

Pull Request Functional Test Report for #4645 / 8ed14c86e2cae34c4fc2ceb9e6a4fabe1dc1dcc9

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Cisco 8000E		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Cisco XRd		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Juniper ncPTX		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Nokia SR Linux		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Openconfig Lemming		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Cisco 8808		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Juniper PTX10008		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.
Nokia 7250 IXR-10e		TRANSCEIVER-5.1: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.