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PoE Standards Explained: 802.3af, 802.3at, 802.3bt PoE++

PoE Standards Explained: 802.3af, 802.3at, 802.3bt PoE++

Compare PoE standards 802.3af, 802.3at and 802.3bt: per-port watts, classes 0-8, 4PPoE cabling, LLDP negotiation and switch power budget planning.

admin admin 2026-09-10
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Junos OS Upgrade with request system software add

Junos OS Upgrade with request system software add

Upgrade Junos OS safely with request system software add: pre-flight checks, validate modes, reboot, verification, rollback and dual-RE notes.

admin admin 2026-09-08
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HPE 3PAR Disk Replacement: showpd and servicemag Workflow

HPE 3PAR Disk Replacement: showpd and servicemag Workflow

Replace a failed disk in HPE 3PAR StoreServ safely: showpd to identify the PD, evacuate chunklets, servicemag start/status/resume, and verify with che

admin admin 2026-09-08
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Cisco IOS-XR Interface CRC Errors: How to Troubleshoot

Cisco IOS-XR Interface CRC Errors: How to Troubleshoot

Diagnose CRC errors on Cisco IOS XR: read show interfaces counters, correlate PCS and optics data, then isolate the faulty cable or module step by ste

admin admin 2026-09-08
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Optical Transceiver Power: Reading Rx/Tx dBm Correctly

Optical Transceiver Power: Reading Rx/Tx dBm Correctly

Read SFP DOM light levels correctly: Tx and Rx power in dBm, typical ranges for 1G and 10G SR/LR optics, warning vs alarm thresholds and fault pattern

admin admin 2026-09-07
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SFP vs SFP+ vs SFP28 vs QSFP28: Types and Compatibility

SFP vs SFP+ vs SFP28 vs QSFP28: Types and Compatibility

SFP, SFP+, SFP28, QSFP+ and QSFP28 compared: lane counts, speeds, standards, vendor coding, DAC/AOC cables and the port compatibility rules that matte

admin admin 2026-09-06
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