Section 060-INDP-111 System Description 2-33
BMC II BISYNC Operation, Administration, and Maintenance Guide BMCB001 and up
Power and Ground Requirements
The following subsections describe the power and ground requirements for
the BMC.
DC power requirements
The BMC system receives dc power from the Central Office (CO) dc power
system. Refer to Figure 2-9 for more information. Minimum operating
voltage is -44 VDC; maximum is -56 VDC. The BMC suffers no damage if a
temporary low voltage condition occurs. However, voltages in excess of -56
VDC can cause damage to BMC hardware.
The BMC places a 6 ampere current load on the dc power source when fully
operational. The noise levels that are embedded on the CO dc power system
by the BMC are:
• 35 dBmv - 0-5 MHz
• 30 dBmv - 5-50 MHz.
Figure 3-1
BMC System Grounding Interface to CO Grounding System
Power alarm condition reporting
If a blown fuse is sensed on the -48 VDC input line of the BMC Power
Supply, the system places -48 VDC on a normally open terminal of the
chassis (A or B) that contains the blown fuse. If a low voltage condition from
the Power Supply is sensed, telephony ground (battery return) is placed on a
normally open contact of the alarm connector for that chassis.
Power
Distribution Panel
Central Office
-48 VDC
Battery Return
To BMC “-48” Terminal
To BMC “GND” Ter-
1
2
3
4
To BMC “Frame” Ter-
To BMC “Signal”
Building Reinforcement
Cold Water Pipe
Master Ground BarCentral
Office
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