AT&T Classic Mail Design Package 1.6 Manual de usuario descargar pdf (Pagina 78)

Equipment Physical Design Standards ATT-TP-76200, Issue 19

AT&T Services, Inc. June 2014

• Equipment supplier’s should reassess or retest their equipment’s performance for

Lightning, AC Power Faults, Steady State Power Induction, and Electrical Safety & DC

Potential Difference whenever materials, components, circuit layout or accessibility is

changed. .Equipment should be reassessed or retested when changes in software

activate hardware not previously active or affect the equipment’s ability to the EMC

requirements of ATT-TP-76200 (Req. 2.6 – 9). The equipment’s reassessment or

retesting may include all of the technical requirements in these sections of ATT-TP-

76200. However, the reassessment or retesting is usually limited to only those

technical requirements effected by the change in the equipment.

B. Section 3, Acoustic Noise (ATT-TP-76200 Section. 3.)

• Equipment suppliers should reassess or retest their equipment’s Acoustic Noise

performance when a change is made to the equipment’s fan design, fan control system

or a change in the number of fans within the equipment.

C. Section 4, ESD

• Subsystems should be tested whenever changes are introduced that may alter ESD

susceptibility. Such changes may include a modified printed wiring board, new/or

additional components additional components, changes to the power supply, additional

telecommunications ports, and changes in chassis design, software activation of

existing hardware or increased clock speed.

D. Section 5, Grounding

• The only Grounding requirements for Ancillary equipment are the short circuit tests.

Embedded ac or dc power supplies should be tested whenever changes are introduced

that could alter these. Such changes may include a modified printed wiring board, new

components or additional components, changes to the power supply, additional

telecommunications ports, changes in chassis design, software activation of existing

hardware or increased clock speed.

E. Section 6, Thermal

F. Temperature and Humidity

If the new equipment is significantly different from existing compliant equipment (e.g.,

different sub components, wiring, spacing, etc.) the previous test data may not be

applicable to the new equipment. In order to be allowed to forego temperature and

humidity testing on a new equipment, the equipment supplier needs to demonstrate to

AT&T Services that the new equipment is physically almost identical to the existing

compliant equipment. This may be done via photographs, written descriptions,

statements, etc.

Heat Dissipation

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AT&T Classic Mail Design Package 1.6 Manual de usuario Pagina 78