AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 294

Unit Load Calculation
7. Try to exchange modules between carriers to reduce the unit loads to 54
(if a 391A1 or 391A2 power supply is installed) or 75 (if a 391A3 power
supply is installed). (Remember that the 100D, 800 NI-BRI, 400, 400
GS/LS, 800, and 800 GS/LS modules have unit loads of 0.0.) Repeat
Steps 1 through 6 to recalculate unit loads for the new configuration.
NOTES:
Empty slots are not permitted between modules.
If the exchange reduces the unit load to below the rated maximum for
your power supply module, no further calculation is required.
If the exchange does not reduce the unit load to 54, replace the
391A1 or 391A2 power supply with a 391A3 power supply. If your
system has a 391A3 power supply and the exchange does not
reduce the unit load to 75, continue to Step 8.
8. Calculate the unit load for slots 5 and 6 of the carrier.
If the unit load for slots 5 and 6 is less than or equal to 27, power is
sufficient for the carrier.
If the unit load for slots 5 and 6 is more than 27, continue to Step 9.
Module
Equipment
Network Access Lines*
DID
DS1
NI-1 BRI
GS/LS
Tie
Telephones
MLX-10
MLX-10D
MLX-10DP
MLX-28D
MLX-20L
BIS-10
BIS-22
BIS-22D
BIS-34
BIS-34D
MLC-5
* Unit loads are computed for each trunk for trunk-type network access lines.
Qty x Unit Load
Hybrid/PBX
or Modified
1.0
0.0
0.0
0.0
1.4
0.9
0.9
0.9
1.2
1.1
0.9
1.0
1.0
1.1
1.1
0.0
= Total
Key
1.0
0.0
0.0
0.0
1.4
1.2
1.2
1.2
1.7
1.6
1.1
1.3
1.3
1.5
1.5
0.0
Continued on next page
System Planning
F–5