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19'' 6U Chassis page 6/71

If a failure occurs on one of the two main power converters, it is detected by a failure

circuitry and the protection power converter is switched on. At the same time an alarm

is generated allowing scheduling a preventive maintenance action for replacing the fan

unit. When the two main power converters are in fail condition, the protection power

converter powers the fans number 1, 3 and 5.

The FAN module is monitored by the mandatory management board plugged in slot 1.

Figure 5 MS430502M chassis Fan Unit block diagram.

Aggregation and transport MICROSENS modules

Each MS generates its internal power supply from the two provided -48V.

The control bus from the MGNT to each MS generic slot is an SPI bus. Each MS generic

slot obtains its physical address from the IDENT pins in the backplane.

A ready (RDY) signal and a presence (PRSC) signal are sent from each MS generic slot to

the MGNT when it is ready for communication with the MGNT.

An Ethernet connection is also provided from each generic MS slot to the MGNT. It is

used for getting Ethernet traffic from the MS modules providing a DCC (Data

Communication Channel) transport.

MICROSENS GmbH & Co. KG - Küferstraße 16 - 59067 Hamm - Tel. +49 2381/9452 0 - Fax 9452 100 - www.microsens.com

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Microsens RS232 Spezifikationen Seite 6