NEC Electra Elite 48/192 Features And Specifications Manual page 425

Issue 6
RELATED FEATURES
LIST
M - 2
General:
The DBM(B)-U10 Box is the Basic Message Display Board that is
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connected to an ESI port and provides eight large LEDs to indicate
up to eight voice mail messages.
required to provide power for this board.
Only the DBM(B)-U10 requires an ESI port and AC adapter.
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A maximum of 384 LEDs can be assigned to the Message Display
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Boards, but only 200 mail boxes can be indicated.
When a voice mail message is left for someone, the corresponding
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large lamp on the board is on.
The large lamp goes off after a person retrieves all new voice mail
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messages.
Message Display Boards can be wall mounted.
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The number of Message Display Boards is included with the
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maximum number of terminals.
One mail box can be assigned to multiple Message Display Boards.
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Feature
Number
D-8
S-14
V-1
The provided AC adapter is
Feature Name
Digital Voice Mail
Station Hunt
Voice Mail Integration (Analog)
Electra Elite
Message Display Board