How to Easily Pass the Nokia 4A0-255 Exam: Expert Advice

Source-based restoration.

Guaranteed restoration

Optical sub-network connection protection

Protection and restoration combined

The OCH protection is implemented.

The O-SNCP protection is implemented.

The E-SNCP protection is implemented.

An OPS is required upstream (left of the OT).

To reduce the impact of chromatic dispersion.

To properly use the available bandwidth of the fibers.

To enable each channel to support a higher modulation format.

To reduce non-linear impairments between coherent and non-coherent channels.

PRC can be as fact as sub-network connection protection (SNCP)

PRC is as fast as restoration mechanisms.

PRC has a recovery time that depends on the broken links.

PRC has a typical recovery time greater than 50 ms.

20 dB

10 dB

7 dB

5 bB

Improved spectral efficiency

Simplified management of the carriers

Narrower spacing between carries of the super-channel

Impairment-free transmission

OUT refer to the section between two multiplexers passing through one or moreamplifiers.

OUT refers to the section between two amplifiers.

OUT enables the multiplexing of OCH connections.

OUT enables FEC processing.

1+1 protection

Minimum cost design

Minimum latency

Resilience against two link faults

It supports more bits per symbol per polarization than 8QAM

It has the same Gbaud rate as 100G 8QAM.

Each symbol supported 2 bits per polarization.

The Gbaud rate is 50.

HDFEC injects less latency into the decoding process than SDFEC.

HDFEC provides a higher coding gain than SDEFC

HDFEC uses fewer thresholds than SDEFC.

HDFEC discards bits earlier in the decoding process than SDEFC.