Mitel MIVOICE OFFICE 250, Installation And Administration Manual

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Installation
257
PHONES
This section provides procedures for installing IP, digital, and analog single line phones that operate
on the MiVoice Office 250. For phone illustrations, see “Phones“ on page 479 . For end user feature
descriptions, refer to the End User Features chapter in the
MiVoice Office 250 Features and
Programming Guide
.
Important Notices
Please read this section before continuing.
NOTICES
• Possible Functionality Degradation . Mitel strongly recommends using the IP devices on a
managed private network. If connected to the public Internet, IP devices will function, but the quality
may suffer due to the dynamic bandwidth availability. The possible problems could be voice quality
degradation, garbled speech, dropped calls, equipment resets, etc. Also, the VoIP suitability of any
Internet connection can change at any time, with no advance notice. Mitel cannot guarantee any
voice quality when connected to the public Internet. Therefore, Mitel is not responsible for
network quality issues that are caused by using the public Internet. For recommended
guidelines on IP network specifications, see page 123.
• Possible Network Instability . Do
not
connect the IP phone PC ports to each other, and do
not
connect them to a hub. Doing so may cause adverse network conditions. Also, Mitel recommends
that you
not
connect additional hard IP phones to the PC ports. Due to the QoS (Quality of Service)
of the hard IP phones, those located downstream will have a lower priority when sending data to the
network. Under heavy network conditions, voice quality may be diminished.
• Equipment Damage Hazard . Only use a single appropriate power adapter with the IP device. Do not
connect a U.S. power supply and a Universal power supply to the same IP device. Also, when using
the Universal Power Supply with a barrel connector, no devices, such as hubs, should be inserted
between the KS/SLA jack on the adapter and the LAN jack on the IP phone because power is supplied
through the cable. To reduce the effects of AC voltage surges and spikes that may cause damage to
the electronic components, a surge/spike protector with the following specifications is recommended:
• Clamp voltage transients at 300 VAC within 5 nsec when exposed to waveforms as described
in the ANSI/IEEE Standard C62.41-1980 (IEEE 587).
• RFI/EMI noise reduction by at least 20 dB at frequencies between 5 kHz and 30 MHz.
The Mitel DataNet CommSource division sells a surge/spike protector, part number 900.0500,
that possesses all of the recommended specifications.