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Mauna Kea Infrared NICI Electronics

Mauna Kea Infrared NICI Electronics. Review Responses. MKIR should review the layout of their thermal enclosures and assess whether combining enclosures (e.g., APDs and electronics) is feasible ? There is not enough room to combine the APDs in the two standard enclosures

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Mauna Kea Infrared NICI Electronics

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  1. Mauna Kea Infrared NICI Electronics

  2. Review Responses MKIR should review the layout of their thermal enclosures and assess whether combining enclosures (e.g., APDs and electronics) is feasible? • There is not enough room to combine the APDs in the two standard enclosures • Combining the APD and electronics racks is not advisable due to the power dissipation/cooling capacity of the Gemini standard enclosures and the cooling requirements for APD operation. • Gemini rack = ~2KW capacity • Rack#2 estimated power dissipation of ~1KW. • APD’s can dissipate as much as 480-240W (light dependent) • BUT APD’s require <40C case temp operation = special conductive cooling plate are planned for the APD enclosure.

  3. Review Responses • MKIR should examine Gemini ICD 1.9/3.7 (instrument and thermal enclosures) that details specifications and configurations for Data and Control LANs. For example, the Gemini provided standard Ethernet switches are Cisco 2U units. • MKIR would prefer that Gemini upgrade their standard and supply 1U switches. If they do not and the 1U units are required because of space constraints MKIR will have to provide 1U switches.

  4. Closed Cycle Cooler Power Supply There is room available in the Electronics enclosures for the power supply. The model of the power supply has not been identified yet. This item remains open.

  5. APD Fiber Bend Radius • Fiber minimum bend radius • APDS will be cabled to a 2 inch min bend radius Several commercial rules are given: According to EIA SP-2840A (a draft version of EIA-568-x) the minimum bend radius for UTP is 4 x cable outside diameter, about one inch. For multipair cables the minimum bending radius is 10 x outside diameter. SP-2840A gives minimum bend radii for Type 1A Shielded Twisted Pair (100 Mb/s STP) of 7.5 cm (3-in) for non-plenum cable. For fiber optic cables not in tension, the minimum bend radius is 10 x diameter; cables loaded in tension may not be bent at less than 20 x diameter. SP-2840A states that no f/o cable will be bent on a radius less than 3.0 cm (1.18-in). The ISO DIS 11801 standard: For fiber optic cables not in tension, the minimum bend radius is 10 x diameter; cables loaded in tension may not be bent at less than 20 x diameter. Recommended minimum bend radius: • momentary = 200x the fiber radius • long term = 400x the fiber radius

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