Hardware manual

Issue 8 Electra Elite
7 - 26 Installing Optional Equipment
3.7 DBM(B)-U10 Box and DBM(E)-U10 Box Message Display
Boards
The DBM(B)-U10 basic Message Display Board is connected to
the ESI(8)-U10 ETU to provide a message waiting LED for voice
mailboxes of personnel without a normal telephone. Each board
has eight message waiting LEDs, and up to eight boards can be
installed in the Electra Elite 192 system to support 64 LEDs.
The DBM(E)-U10 expansion Message Display Board has eight
message waiting LEDs and is connected to the DBM(B)-U10 or
another expansion board. Each DBM(B)-U10 basic board can
support up to five expansion boards and 40 additional LEDs.
The total number of LEDs is 384, but the Electra Elite 192 System
can only support up to 200 mailbox indications. Multiple locations
of the same mailbox are permitted. Refer to Figure 7-31
DBM(B)-U( ) and DBM(E)-U( ) Message Display Boards and Figure
7-32 Maximum Display Indications.
Figure 7-31 DBM(B)-U( ) and DBM(E)-U( ) Message Display Boards