Nortel M3110 Installation Manual page 33

The BLF/CGM can do the following:
• display the status (busy or idle) of up to 150 consecutive extensions
within the system Standard Busy Lamp Field (SBLF)
• display the status (busy or idle) of any hundred group of DNs within the
system Enhanced Busy Lamp Field (EBLF)
• display which attendant console is the supervisory console and which
consoles are active
• display supplementary information about individual extensions, such as
the reason the person is away (business, vacation, or illness), when the
person is due to return, and an alternate extension where calls to the
person should be directed
• display a company logo
• display graphics
• display text in any one of eight languages
• have its screen contrast adjusted for easy viewing
Power requirements
The BLF/CGM obtains its power through the attendant console. See Figure 1
on page 35. The requirements are as follows:
• a reference ground line (0 V)
• power source of 5 V for the CMOS electronics that control the Lamp
Field Array module (c. 50 mA)
• power source of –12 V for the display of the Console Graphics Module
(c. 10 mA)
• backlighting power
The BLF/CGM has a battery that provides backup power to maintain the
Supplementary Information when the console is powered down. The battery
lifetime is five years. To replace the battery, return the BLF/CGM to the
supplier.
Telephones and Consoles
Attendant consoles
Description, Installation, and Operation
Page 33 of 504