Knowledge

The aging test is often simplified to a few hours of lighting, and the actual interpretation relies on parameter comparison before and after power is turned on. This article gives the action boundary of the aging test, four types of drift items that must be measured, and the method of using batch consistency to make release determinations.

When doing the same temperature test, some batches are still shaking online after completion. The difference lies mostly in the test design. This article explains how to select the temperature zone, how to determine the holding time, and why it is necessary to retest with service traffic at the endpoint temperature.

Moisture can cause premature equipment failure through migration and condensation. This article provides a general design sequence for weighing protection levels against internal power consumption, selecting a dehumidification method, and checking sealing and drainage details.

The power supply levels are divided based on the tolerable interruption time, and the conservative calculation method of the backup time and the four requirements for dual-circuit to the equipment side are given to avoid only doing power distribution redundancy while the equipment still has a single power supply.

The wide-temperature selection determines whether it can work, and the derating design determines how long it can work. This article explains the impact of continuous high temperature from the perspective of life, the three types of components that age first, and the derating and alarm actions that can be performed during the selection stage.

Based on the two types of discharge mechanisms, the human body model and the device charged model, general ESD protection specifications for optical modules and network cards in the three links of warehousing, assembly and on-site operation and maintenance are given, focusing on potential damage and humidity control.

This article sorts out three general guidelines for the grounding and shielding design of communication network equipment, explains the distinction between the three types of grounding roles, the applicable conditions for single-ended and double-ended shielding layer connections, and clues for troubleshooting ground circulation problems.

From the three levels of intrusion path, graded energy coordination and photoelectric demarcation, the general reliability design principles for surge protection of communication and network equipment are explained, and a list of parameters that should be checked during the selection stage is given.

The more module specifications there are in the spare parts cabinet, the greater the risk of sluggishness. This article explains how to select the general profile of an optical module: use the main profile to cover most links, pay attention to the three boundaries of speed, distance and short-circuit overload, and manage the ledger at two levels.

After summer, the computer room temperature and fan alarms increase. This article recommends conducting quarterly checks around high-temperature derating, power supply margin and fan operating conditions, and three sets of inspection records, and settling the accounts of network equipment power consumption and heat dissipation at once.