Nortel Meridian 1 Manual page 65

Busy Lamp Field/Console Graphics Module
The Busy Lamp Field/Console Graphics Module (BLF/CGM) obtains its
power through the attendant console. See Figure 16. 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
An external floating 16 V dc (300 mA) power supply is required to be cabled
in at the local Main Distribution Frame (MDF) at a maximum of 120 ft (36 m)
from the attendant console when the BLF/CGM is installed (A0367601 –
Transformer). This provides all the power requirements for the M2250
applications.
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 5 years. To replace the battery, return the BLF/CGM to your
supplier.
The BLF/CGM mounts on the back of the attendant console and is held on
with snapfits and two screws.
The attendant console's top cover must be removed to install the BLF/CGM.
Refer to the M1250/M2250 Attendant Console User Guide or the Busy Lamp
Field/Console Graphics Module User Guide for further information. Refer to
Attendant Consoles: Description (553-2201-117) for a description of M2250
attendant consoles equipped with a BLF/CGM.
Follow normal anti-static precautions when installing the BLF/CGM onto the
attendant console.
Add-on modules
Telephone and Attendant Console Installation
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