Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
3.6 POWER AVAILABLE FOR CHANNEL MODULES
Each shelf's power supply must provide sufficient power for the Common Modules, DACS module,
channel modules, and Optical Interface Adapters (OIAs) in that shelf. The power requirement for the
Common and DACS modules is approximately 12 watts. This means a Shelf equipped with a 50-watt
supply and electrical interfaces has 38 watts available for channel modules (50 watts minus 12 watts
for the Common Modules). A Shelf with a 50-watt supply and 4 LASER fiber optic interfaces has 30
watts available for channel modules (50 watts minus 12 watts for the Common Modules and 10 watts
for the OIAs).
3.7 DETERMINING CHANNEL MODULE POWER REQUIREMENTS
To determine how much power the channel modules in a multiplexer shelf will draw, refer to Table
3-1. The current draw at +5V, +15V and –15V for all IMUX 2000 M-DACS channel modules,
Common Modules, DACS modules, OIAs and Module Adapters are given in these tables.
To use the tables, write down the number of modules of each type in the multiplexer shelf in the
"Number Per System" column. Multiply the “Number Per System” column by the product of the
voltage x current at +5V, +15V and –15V and enter the results in the appropriate “Watts@”columns.
Then calculate the watts/card, and enter the results in the last column. When you are finished, add up
all the totals to determine the total power consumption for the shelf. If the current draw exceeds 4.5
Amps from the+5V supply, 0.75 Amps from the+15V supply, or 0.75 Amps from the–15V supply,
additional power supply capacity is required.
3.8 POWER SUPPLY REDUNDANCY
IMUX 2000 M-DACS Shelves may be equipped with two power supply modules for redundancy. If
the primary supply fails, the redundant supply is automatically switched in to provide uninterrupted
multiplexer operation.
Note that the second supply is strictly a backup to the first, not an increase in available power. The
total shelf power is the individual capacity of either supply, not their sum. For example, a Shelf
equipped with two 50-watt power supplies would have a total of 38 watts available for channel
modules, not 98 watts.
M-DACS-T1 RFL Electronics Inc.
October 25, 2004 3-14 (973) 334-3100
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