Ericsson EDN312 Guia do Utilizador descarregar pdf (Página 11)

Function Description

4/1553-HSC 901 101/2 Uen B 2009-02-27

3 Function Description

Some of the functions in the different nodes are common for two or three

nodes, while others are specific for a specific node.

3.1 Common Functions

This section describes functions that are common for at least two of the

nodes.

3.1.1 EDN312, ESN108, EXN104 Fan and Temperature Control

The nodes uses temperature control state for controlling the fans, as

condition for sending temperature related traps, and if the state is TooHigh

- deactivating all the ADSL lines (EDN312 only). The EDN312 will turn off

the LEDs when the temperature reaches 85° C.

The ADSL lines are stopped in order to reduce the power consumption and

avoid damage to the IP DSLAM. The high temperature value is probably

caused by fan failure, high environment temperatures, or blocked air

outlets. The lines remain deactivated until the temperature reaches the

Normal state, when they are activated again, and an alarm-ceasing trap is

sent.

The thresholds between the temperature states contain hysteresis, as

depicted in Figure 4 on page 8. Note that under normal operation the

temperature state will change between Low, Normal and High. The fan

control will try to maintain the Normal temperature state.

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Ericsson EDN312 Guia do Utilizador Página 11