AT&T Classic Mail Design Package 1.6 Manual do Utilizador descarregar pdf (Página 79)

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

AT&T Services, Inc. June 2014

Heat dissipation should be recalculated whenever a change is introduced that changes

the power usage of the unit.

Airflow Path

Airflow path(s) should be updated whenever a change is introduced that changes the

documented airflow(s) of the unit.

Direction and Velocity (Effective 1/1/2012)

Direction and velocity(ies) of the designated airflow paths should be updated whenever

a change is introduced that changes the documented airflow(s) of the unit.

G. Section 7, DC Power

The equipment supplier may perform an analysis, using good engineering based on

similarities to the existing equipment, predicting the probable conformance of the new

equipment to Ancillary DC Power requirements. This analysis should consider similarities

and differences of electric components, wiring, and power levels. The analysis shall be

submitted to the company representative for review and approval by AT&T Services.

H. Section 8, Airborne Contaminants

In reference to Airborne Contaminants testing, Telcordia GR-1274-CORE, states that “The

qualification test shall be passed once for each new family of printed wiring assemblies.”

Based on Telcordia’s assessment, new assemblies for enhanced equipment need not be

tested for airborne contaminants if they meet the criteria for the same design family of

printed boards, defined as follows:

• A design family consists of printed wiring boards from the same manufacturer; using the

same design rules for minimum line spacing and maximum electric field, and using

components that require the same bias voltages. Within the same design family,

boards shall have the same finish, i.e. they shall all be bare or all be coated with the

same overcoat.

If the equipment supplier does not test some or all of the printed wiring boards in

enhanced equipment, they shall supply a statement affirming that the board(s) not

tested meets the definition for being in the same design family of a equipment

previously approved for use in AT&T. Documentation verifying the conformance of the

tested card must be submitted for review.

I. Section 9, Shock and Vibration

Equipment should be tested whenever changes are introduced that could alter the physical

integrity of the unit.

1 2 ... 74 75 76 77 78 79 80 81

Sem comentários

AT&T Classic Mail Design Package 1.6 Manual do Utilizador Página 79