Specifications

Engineering Guidelines

are auto-sensing. NSU cabinets also have universal (auto-sensing) power inputs. Migrated

SX 2000 DSU cabinets each have a switch on the power supply to select 120 VAC or 230 VAC

power. The Peripheral Cabinets are available as either 120 VAC/60 Hz or 230 VAC/50 Hz.

During a local power failure, data that is being written to a disk or FLASH module may not be

completely stored and it can become corrupted. Use of RAID can improve the integrity and

data validation, but cannot guarantee data that wasn’t completely transferred due to loss of

power. Systems most affected will be those undergoing updates or those that store voice mail.

We strongly recommend that these systems, including the ICPs, be powered through UPS units

or similar power backup systems.

More details on platform power consumption and settings can be found in the 3300 ICP

Hardware Technical Reference Manual.

MiVoice IP Phone Power

PoE (Power over Ethernet) is a method of providing power to the phones over the existing

Ethernet wiring that the phones use for connecting to the LAN.

MiVoice IP Phones support 802.3af power over Ethernet. With the exception of the 3300 CXi/CXi

II ICP, power provisioning to the IP phones is not provided from the 3300 controllers. For details

regarding power provisioning from the CXi and CXi II, refer to “3300 CXi/CXi II ICP 802.3af

Power over Ethernet capabilities” on page 93.

Power can be provided to the phones either locally by an AC power adapter or remotely by a

network device that supports PoE.

Local Phone Powering

Phones can be powered locally with the following methods (depending on the model):

• With an AC power adapter that converts mains voltage into the 24VDC required by the

phone.

• With a special in-line Ethernet power adapter that provides a local power feed to the Mitel

5000, 5200, and 5300 series of IP phones. This adapter converts mains voltage into -48

VDC and supplies power to the phone over the Ethernet cable.

Remote Phone Powering

Phones can use one of three different communication standards to advertise their power

requirements to a powered Ethernet switch. In all cases both the phones and the powered

Ethernet switch must comply with the same standard. The three standards are:

1. IEEE 802.3af Power Over Ethernet Standard (PoE)

2. IEEE 802.3ab Link layer Discovery Protocol (LLDP-MED)

3. Cisco Discovery Protocol (CDP)