Self Protection - Aastra AXD Installation And Maintenance Manual

3.8.5.4

Self protection

Self protection of the iPBXs is ensured by the remote supply module:
• Isolating the faulty elements using the power supply protection fuses
• Monitoring the fans (see Section 3.8.7).
3.8.6 Power supply chain (figure 3.23)
3.8.6.1 Aastra XD
Aastra XD cabinets are powered by one or two plug-in power supply units (type
ADS350XD or ADS300XD).
Caution :
• In a simplex configuration with secure power supply and in a duplex configuration,
each cabinet is power up by two power supply units. The power supply modules then
work in load-sharing mode. If a power supply unit fails, the other takes over the load
(only one unit is enough to sustain the full load required by a cabinet). This switchover
is transparent for the cabinet equipment. There is, thus, no service interruption.
Nota : The power supply modules of a main cabinet cannot supply power to an
expansion cabinet just like the power supply modules of an expansion cabinet
cannot supply power to a main cabinet.
• In a simplex configuration, the cabinets are powered up by a single power supply unit.
A ventilation module is installed in place of the second power supply module. This
ventilation module comprises two fans powered up and supervised by the power
supply module.
The internal power supplies are distributed by a converter supplied with alternating
voltage: 115/230 V - 50/60 Hz.
The power supply module provides the direct low voltage power supplies for:
• The different iPBX cards, voltages supplied via the back plane:
- power supplies required by their internal circuits
- ringing current (for certain equipment cards)
- set line current (-48 V)
Each back plane connector of the AXD iPBXs hosting an expansion card has
advanced contacts for earth and +5 V enabling hot plugging, during cabinet
operation, of the CLX cards and new generation equipment cards (Lx16-X).
• The fans on the power supply and ventilation module(s)
An optional, 48 V backup battery, connected to the back of the cabinet, can be installed to
provide direct power supply to the converter in case of mains failure (see Specifications in
Section 3.8.7.1).
AMT/PTD/PBX/0058/4/6/EN
Page 104 01/2011
Both ADS350XD and ADS300XD in the same cabinet is not possible.
Description et caractéristiques d'un PBX
Installation and Maintenance Manual - Aastra 5000