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Passport Carrier Release
Passport Carrier Release (PCR) is a version of the Passport Switch (now Multiservice Switch) software designed to run in telecommunications carrier environments. It was formerly developed by Nortel. After the sale in 2009 of most Nortel's assets, the passport SW is still used in several products of Alcatel-Lucent, Ericsson and Kapsch.
The passport products are now part of Ericsson's PPX products under IP Networking. The Ericsson PPX products can be found at the following link.
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==Technologies==
Internally, PCR is largely built up of custom applications on top of a VxWorks kernel. A benefit of the software is that it is completely modular and can load components to Passport control processors (CPs) and function processors (FPs) on an as-needed basis. FPs (also known as line cards) each run their own instance of the Operating System, and as such can be rebooted without the need to take the entire switch out of service, for example due to a software failure. As well, as would be expected, entire cards can be replaced while the system is hot, thus minimizing downtime due to hardware failure.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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