Instruction manual

Unit Loads
2-20
Installation, SPM, Maintenance, and Troubleshooting Supplement
Calculating Unit Loads 2
The 491D1 power supply for the MERLIN MAGIX Integrated System provides
up to 96 unit loads of power. If the unit loads in a carrier exceed 96 unit loads,
reconfigure the carrier so that the unit loads are 96 or less. For Example:
■ In Key mode, the MERLIN MAGIX 491D1 power supply can generally
support up to three 016 MLX, 024TDL, or 016 ETR modules, as long as no
DID, OPT, or E&M Tie Line modules are in the same carrier.
■ In the Hybrid/PBX mode, the 491D1 power supplies can generally support
up to four 016 MLX, 024TDL, and 016 ETR modules, as long as no DID,
OPT, or E&M Tie Line modules are in the same carrier.
In many circumstances, a more accurate unit load calculation may be useful.
This may include situations where modules are not fully utilized, a
predominance of large multi-button sets are used, there is a change in the
equipment, or you suspect that a particular carrier has more unit loads than the
power supply can handle.
To calculate the actual unit loads per carrier:
1. Add up the unit loads for each type of module by using Table 2-4. If the total
doesn’t exceed 96, no further calculations are necessary. Table 2-4
assumes a mix of telephone types with no more than 50% of telephones
being large, multi-button telephones (4424LD+, 4424D+, 4412D+, MLX-
20L, MLX-28D, ETR-34D, and ETR-18D telephones).
Table 2-4. Unit Loads Per Module (48vDC)
Circuit Module App Code Type UNIT LOAD
617A52 412 LS-TDL 13
617A58 024 TDL 24
617A59 100R INA 0
617C21 008 MLX 13.5