Mitel MIVOICE OFFICE 250, Installation And Administration Manual, Page: 244 / 585

MiVoice Office 250 Installation and Administration Guide
216
Installing DEI Hardware
Total digital telephone capacity is 192 (12 DEMs in four DEI chassis). See “Capacities” on page 67
for additional system capacity information.
The following items are discussed in this section:
• Considerations on
page 216
• Installing/Upgrading the DEI Chassis on page 217
• Troubleshooting on page 218
• Downgrading DEI Chassis on page 219
• Time Slots for DEIs on page 219
Considerations
In addition to any hardware/software information discussed in this manual and in the DEI notice
(part number 835.3242) that ships with the DEI unit, please take into consideration the following,
when installing and bringing up DEI units:
• If adding DEIs to an existing system, perform a database backup and database save before
installing any DEIs. Be prepared to log on and view the logs.
• Use the Power Calculator (available on the system software DVD) to approximate the power
usage for the system chassis and related peripherals, including the DEI chassis. For the pur -
poses of the calculator, the DEI chassis is classified as a Small App.
• In addition to the installation guidelines for hardware earlier in this manual, check for proper
grounding. For example, the ground lug on the chassis must be in parallel with the AC ground
via the power supply. Check with local Building Safety Inspectors on the installation of the ground
wire for the system. Conduit may be required between the ground bar and earth ground. Refer
to the System Equipment Grounding Guidelines, part number 835.2845, for additional
information.
• Detach the voice mail system from the last DEI in the chain before adding additional DEI units.
When installing and upgrading new DEIs, leave the system powered on, disconnect existing
DEIs, and connect new DEIs one at a time. If the system has DEIs, disconnect them, and connect
only DEI #1. If no DEIs exist, and you are adding new DEIs, connect only DEI #1.
• If the attached DEIs do not come online, recycle the power on all DEIs; also, check that you
selected the correct mode (2- or 4-mode) in DB Programming. if they remain offline, contact
Technical Support for further assistance.
The DEI low-level firmware controls how it communicates. For this upgrade, the method of
communication changes. To update the DEI low-level firmware, it must be communicating in the
previous two-DEI configuration. The MiVoice Office 250 software automatically loads the latest
DEI software when DEIs are connected and the system is restarted.
IMPORTANT
Do
not
plug in any power cords until instructed to do so. Powering up the system occurs
later in the installation.