Generic Information

LTPH-UM-1234-01

 

 

3This rule minimizes power consumption and dissipation from the HLU providing doubler power. It requires the spans closer to the HLU to be as short as possible and the spans farther from the HLU to be as long as possible. This choice minimizes the I2R loss in the cable pairs and reduces the thermal stress on the HLU.

Only those HRUs that have a local powering option can be used in local HRU-powered applications.

The HDU-409 can be housed in a variety of outdoor enclosures manufactured by ADC and a variety of other vendors. The number of doublers used in any of the enclosures depends on the maximum outside ambient temperature. The doubler capacities for several of these standard enclosures are listed in Table 4, Table 5, and Table 6 starting on page 11. The capacities listed in Table 5 and Table 6 are based on a maximum outside temperature of +115°F (+46.1°C). Consult ADC for the latest deployment rules when using the enclosures at ambient temperatures above 115 °F or when using enclosures not listed.

These requirements comply with Bellcore standards, which require HDSL equipment placed in outdoor cabinets to operate in an outside ambient temperature of -40°F (-40°C) with no solar load and +115°F (+46.1°C) with a maximum solar load and maximum power dissipation.

Full solar load is equal to maximum sunlight exposure as defined in Bellcore’s Technical Advisory TR-TSY-000057.

The capacities listed for the indoor enclosures in Table 4 on page 11 assume no solar load. The capacities listed for the outdoor enclosures in Table 5 and Table 6 on page 15 assume a full solar load as described above. The “Recommended Slot Assignment for Maximum Capacity” column assigns slots according to the following thermal stress reduction rules:

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April 30, 2003

HDU-409 Lists 1, 2, and 3