Aastra XS Product Manual

Also see for X Series: User guide Quick user guide Installation and Implementation Manual

Contents

Aastra XS Product Manual Manual pdf 51 page image

Product Guide - A5000 R5.4 – Aastra X seriesBPS0121AENAA01 Page 51/745.3.9 Duplicated services of the AXD5.3.9.1 Duplicating the power supply modulesPhysical descriptionThe main AXD cabinet can receive two ADS350XD power supply modules, although one is enough tomeet the power supply requirement of a cabinet, even if fully charged.Furthermore, each expansion cabinet can receive two ADS350XD power supply modules.The power supply modules connected in the main cabinet cannot be used for providing power to anexpansion cabinet and vice versa.Switchover procedureWhen there are two power supply modules in a cabinet, they work in load-balancing mode.If one power supply module becomes faulty, the other one carries the entire load. This switchover istransparent for the cabinet’s equipments. Thus, there is no service interruption.The faulty power supply module must be replaced manually. The faulty power supply module can beremoved without switching-off the Aastra XD (hot-disconnection). Then a working power supplymodule is fitted in the empty position, still without switching-off the system (hot-connection). This newpower supply module now shares the load with the first one.This procedure applies both to the main cabinet and the expansion cabinet.If the main cabinet is powered off (due to power failure or the disconnection of a source of powersupply), the expansion cabinet(s) stop(s) working.On the other hand, if an expansion cabinet is powered off, the main cabinet remains operational, butthe absence of expansion cabinet services (subscriber) will highly disturb the system’s level of service.5.3.9.2 Duplicating the motherboardsThe time required to synchronise the two motherboards must be as short as possible. Therefore, thelink between the two motherboards, and also the protocol used, are optimised.Physical descriptionThe AXD main cabinet can receive two UCV2D motherboards although one is enough to operate theentire system services.The expansion cabinets have one or two RUCVD cards instead of a UCV2D card although one isenough to operate the entire system services.Switchover procedureWhen there are two motherboards in the main cabinet, one is active and the other passive (that is notused by any service in the system).When the active motherboard becomes faulty, or is intentionally removed from the cabinet, or if aswitchover is caused by a MMI or the Management Centre, the passive motherboard becomes active.This takes within 1 and 6 minutes, depending on the configuration; on average this switchover timewill be about three minutes. Therefore, on-going calls are cut, and all the system services lost for thisperiod of time.A hardware failure is a degradation of the motherboard’s hardware or software components, resultingin the complete stop of this motherboard.A software failure is an anomaly resulting in the system software reboot. It does not lead to aswitchover to the passive motherboard, the active motherboard is simply restarted.A faulty motherboard must be replaced manually. The faulty Motherboard can be removed withoutswitching off the system (hot-disconnection). Then a new motherboard is fitted in this position, stillwithout switching off the system (hot-connection). Finally, this new passive card must be declared