Mitel MIVOICE OFFICE 250, Installation And Administration Manual, Page: 247 / 585

Installation
219
Downgrading DEI Chassis
To downgrade DEI chassis:
To connect a DEI that has v3.0 or later firmware to a pre-v3.0 5000 CP, the system must
downgrade the DEI firmware during installation. Do not connect more than one DEI to the
pre-v3.0 5000 CP at a time. Follow the procedure “Installing/Upgrading the DEI Chassis” on
page 217 .
Time Slots for DEIs
Table 38 summarizes the devices, features, and modules that require time slots.
After upgrading to v3.0 or
later, the system cannot
communicate with the third
and/or fourth DEI(s).
Incorrect license. Obtain a valid v3.0 license with the
appropriate number of DEIs.
One or more DEI(s) have over
allocated voice channels.
Redistribute devices among the DEIs to
avoid voice channel over allocation.
Disable features such as OHVA,
dual-SLAs, or MDPMs to reduce the
required voice channels on a DEI.
The system is set to 2-DEI
mode.
Change the DEI Mode setting in DB
Programming to 4-DEI mode.
The system is showing “Out
of Voice Channels” alarm.
A call on a DEI failed because of
timeslot/voice channel over
allocation.
Move devices to other DEIs to eliminate
the timeslot over allocation.
Table 38: Time Slots for DEIs
Device/Feature Time Slots Used
Digital Telephones 1
Digital Telephone/MDPM 2
Dual Single Lines 2
Dual DID 2
Single Line/DID 2
Digital Telephone with OHVA Receive On 2
Single Line Module - 8 8
Table 37: Troubleshooting DEIs (Continued)
Scenario Cause Resolution
(Sheet 2 of 2)