User's Manual

Mobile WiMAX Outdoor RAS SPI-2210 System Description/Ed.05

(Continued)

Board Name Quantity Function

HDM-D 1 Heater and Damper Module-DMB

- HDM-D raise the temperature inside the system. (Heater: 1EA)

- Open/close the exhauster of cabinet in the back of DMB

Membrane Filter 2 Protect the outdoor SPI-2210 from dust and rain

 Membrane filter

The membrane filter enables the cool air to flow into the outdoor SPI-2210 and to

protect the outdoor SPI-2210 from dust and rain.

 HDM-R/HDM-D

The HDM consists of the heater and damper. On the outdoor SPI-2210, HDM-R

mounted on the bottom of the RFB and HDM-D mounted on the bottom of DMB are

mounted.

The function of damper and heater is as follows:

 Damper

If the outdoor SPI-2210 is in the cold start or low temperature mode, the damper

blocks the ventilating opening of the cabinet to prevent the outdoor SPI-2210 from

heat loss in case of internal heating and to circulate the air in the inside.

 Cold Start & low temperature mode: Damper Close

 Normal temperature & high temperature mode: Damper Open

 Heater

The heater enables to raise the temperature inside the system when the temperature

inside the system becomes the permissible level or less when initializing the

system, operating the system. The heater is installed in the DMB and in the RFB,

respectively, in order that the DMB and the RFB can operate normally when the

system is in the low temperature.

The UCM operates the heater according to the temperature inside the system

detected by the temperature sensor mounted inside the outdoor SPI-2210.

 Cold Start & low temperature mode: Operating the heater

 Normal temperature & high temperature mode: Stopping the heater

 Fan

On the outdoor SPI-2210, the fan (FAN-POD) dedicated for the DMB, which

consists of a set of two fans is mounted, and three fans (FAN-POR) dedicated for RFB

are mounted. The FAN-POD and the FAN-POR maintain the temperature inside the

cabinet appropriately in order that the system can operate normally. The UCM controls

the fan according to the temperature inside the system detected by the temperature

sensor mounted inside the outdoor SPI-2210.

 Cold Start & low temperature mode: Operating at low speed

 Normal temperature & high temperature mode: Operating at high speed