Actively Cooled; Passively Cooled; Pusher Fan Cooled - ADTRAN MX2820 System Manual

MX2820 System Manual

Actively Cooled

Figure 2-1 provides an example of an actively cooled bay installation that contains multiple
MX2820 shelves and also meets the NEBS heat release objectives. Based on 30-inch mainte-
nance and 24-inch wiring aisles, 12-inch equipment depth, 5-inch rack extenders, and 26-
inch overall equipment width, this example allows for a NEBS heat budget of 1521 watts. Nine
23-inch MX2820 shelves are shown in the bay configuration example.

Passively Cooled

Figure 2-2 provides an example of a passively cooled bay installation that contains multiple
23-inch MX2820 shelves and meets the NEBS heat release objectives. Using the same bay
configuration as mentioned for an actively cooled bay installation, this example allows for a
NEBS heat budget of 1130 watts.
With this configuration, up to seven 23-inch MX2820 shelves could be mounted in a 7-foot
bay.
NEBS recommendations and shelf spacing guidelines should be followed for both actively and
passively cooled installations.

Pusher Fan Cooled

The Pusher fan assembly can be used when there is limited rack space (for example, adding a
MX2820 system to a rack that is already installed with other equipment). Cooling is provided
directly to the MX2820 chassis by the adjacent fan assembly.
Higher-density applications can be achieved with rack extenders.
In the higher-density applications, as shown in the bay configura-
tion examples, the rack extenders provide additional space for bet-
ter cable management.
If the MX2820 shelf is deployed in racks with other equipment, a
heat baffle should be mounted below the MX2820 shelf to provide
isolation from heat from the other equipment (with exception of the
pusher fan).
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