According to the National Audit Office only a quarter of the claimed savings were fairly represented while the second efficiency programme launched just last year is "cutting services to claim efficiencies" - and has "acute" measurement problems.

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Riding on cutting-edge technologies such as flex oDSP, super SD-FEC, and flex modulation format, this field trial achieved a record-breaking transmission distance of 1, 500 km using a super-channel PDM-16QAM-based high spectral efficiency solution, and a second record-breaking transmission distance of 3, 325 km using a super-channel Nyquist PDM-QPSK-based ultra-long-haul solution.

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The unit's efficiency ranked ninth, first and second in the NFL, respectively in 2008, 2009 and 2010, according to analysis site Pro Football Focus.

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