Title :
Thermal design of the TW-150 passive optical network access unit. II
Author :
Tahmaspur, Mohammed ; Berhe, Mulugeta K.
Author_Institution :
Terawave Commun., Hayward, CA, USA
Abstract :
The TW-150 unit is a thermally hardened product designed to operate under harsh ambient conditions ranging from -40 to 75°C and altitudes of up to 13,000 ft above sea level. The unit is designed so that the case and junction temperatures of any component should not exceed 85 and 90°C, respectively. Further, the case temperature of the optical module is to be limited to 76°C under all operating conditions. Extensive thermal analysis was conducted so that the box operates reliably under these conditions with an acceptable mean time between failure. We present comparison of CFD results with experiments for selected cases. We then discuss transient modeling and fan failure analysis, the effects of fan speed and altitude on temperature of components, and comparison of honeycomb vent with perforated plate vent. We then discuss miscellaneous effects such as the effects of fan power, leakage through small gaps in the system, and placement of temperature sensors inside the unit.
Keywords :
computational fluid dynamics; cooling; heat sinks; mesh generation; optical fibre subscriber loops; temperature distribution; thermal management (packaging); 40 to 75 C; CFD; TW-150 unit; altitude effects; fan failure analysis; fan speed; honeycomb vent; passive optical network access unit; perforated plate vent; temperature sensors; thermal analysis; thermal design; thermally hardened product; transient modeling; Failure analysis; Ocean temperature; Optical design; Optical network units; Optical sensors; Passive optical networks; Product design; Sea level; Temperature sensors; Vents;
Conference_Titel :
Thermal and Thermomechanical Phenomena in Electronic Systems, 2002. ITHERM 2002. The Eighth Intersociety Conference on
Print_ISBN :
0-7803-7152-6
DOI :
10.1109/ITHERM.2002.1012530
