Enclosures I Sub-Assemblies
MCMC of the MCH with the EMMCs (enhanced module management controllers) of the PMs (power modules) and CU (cooling unit) in a bussed, redundant architecture. It was still necessary to link the new RTMs into the management. The working group therefore decided to tie each RTM via an I”C bus to its respective AdvancedMC module (see Figure. 2). The rear module is then managed in the same way as its corresponding FRU (field replaceable unit) at the front.
Cooling front and rear MicroTCA.4 defines active cooling for the front and rear modules. The two areas
can also be cooled independently of one another, which is made possible by placing active logic on the rear modules. With a fan management system more advanced than that of MicroTCA.0, the front and rear areas can be independently regulated via the MCH in a number of steps from zero to maximum fan speed.
Possible applications While the MicroTCA.4 specification was created at the initiative of the physics community, features such as rear I/O, high availability, redundancy and remote maintenance also make it suitable for applications in the fields of industrial automation, image processing, real-time
Figure 4: 19in. MicroTCA.4 system with 12 AdvancedMC slots.
motion control, medicine, transportation, and test and measurement.
Figure 2: Management: the RTM is linked via an I2C bus to its respective AdvancedMC module.
First systems available With the MicroTCA.4 specification now adopted by the PICMG consortium, Schroff has recently introduced two MicroTCA.4 systems. The first of these is an entry-level cube system (see Figure. 3) for development purposes and consists of a 5U-high, 42HP-wide chassis complete with backplane, power supply and fan. At the front there are six AdvancedMC slots, one MCH slot and one slot for a plug-in 300W PSU, while the rear of the unit provides six RTM slots. Forced ventilation of the front and rear slots is provided by speed-controlled fans.
The second MicroTCA system designed to the MicroTCA.4 specification is a 19in. version for field use (see Figure. 4). Measuring 9U high and 84HP wide, the system provides 12 AdvancedMC slots, two MCH slots and four power slots at the front, and 12 RTM slots at the rear. Two redundant hot-swap fan units with EMMC in push-pull configuration complete the system.
Schroff UK |
www.schroff.co.uk
Keith Reynolds is technical/marketing manager at Schroff UK Ltd and Christian Ganninger is category manager for systems EMEA at Schroff GmbH
www.cieonline.co.uk
Components in Electronics
February 2012 35
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