Table 2-12. Heat Dissipation For Shelf; Table 2-13. Heat Dissipation For Individual Frame; Mx2820 Heat Dissipation And Gr-63-Core; Shelf Level - ADTRAN MX2820 System Manual

MX2820 Heat Dissipation and GR-63-CORE

The following guidelines are intended to aid the designer and planner for installations of
shelves and meeting NEBS heat release objectives. Since the system supports M13 and STS-
1 modules, much forethought should be given to the installation and possible future
expansion. Depending on the technology employed, various scenarios and shelf densities can
be achieved. Refer to
An MX2820 installation that uses STS-1 modules should be
actively cooled.
Telcordia GR-63-CORE specifies the physical protection requirements and objectives for
telecommunications equipment. Often referred to as "NEBS" (Network Equipment-Building
System), these guidelines have become the de facto standard for U.S. telecommunications
equipment and include both requirements and objectives for heat dissipation.
The NEBS requirement is that the heat release of telecommunications equipment be
documented. For the system, this is done in the
section.

Shelf Level

NEBS further provides specific objectives for heat dissipation within a shelf in paragraph
O4-12 of GR-63-CORE. For an equipment shelf such as the , the relevant values are as follows
in Table 2-12 (from GR-63-CORE Table 4-6).
Heat Release Method
Natural convection
Forced-air fans

Frame Level

NEBS provides specific objectives for heat dissipation in a frame in paragraph O4-12 for a
frame such as intended for the system. The relevant values are as follows in
GR-63-CORE Table 4-6).

Table 2-13. Heat Dissipation for Individual Frame

Heat Release Method
Natural convection
Forced-air fans
61186003L1-1D
Figure 2-1and Figure 2-2

Table 2-12. Heat Dissipation for Shelf

Requirements
2
740 W/m per meter (20.9 W/ft
ment uses
2
995 W/m per meter (27.9 W/ft
ment uses
Requirements
2
1450 W/m (134.7 W/ft
2
1950 W/m (181.2 W/ft
Section 2, Engineering Guidelines - Power Dissipation Considerations
for examples of frame installations.
NOTE
"Power Dissipation for an MX2820 Shelf"
2
/ft) of vertical frame space the equip-
2
/ft) of vertical frame space the equip-
2
)
2
)
Table 2-13 (from
2-11