Page 1095 - 5G Basics - Core Network Aspects

Transport aspects 2

1 Scope
The optical transport network (OTN) supports the operation and management aspects of optical networks
of various architectures, e.g., point-to-point, ring and mesh architectures.

This Recommendation defines the interfaces of the OTN to be used within and between subnetworks of the
optical network, in terms of:
– OTN hierarchy;

– functionality of the overhead in support of multi-wavelength optical networks;
– frame structures;
– bit rates;
– formats for mapping client signals.
Functions and process flows associated with the defined interfaces are specified in [ITU-T G.798].

The interfaces defined in this Recommendation can be applied at user-to-network interfaces (UNI) and
network node interfaces (NNI) of the OTN.

2 References

The following ITU-T Recommendations and other references contain provisions which, through reference in
this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated
were valid. All Recommendations and other references are subject to revision; users of this
Recommendation are therefore encouraged to investigate the possibility of applying the most recent
edition of the Recommendations and other references listed below. A list of the currently valid ITU-T
Recommendations is regularly published. The reference to a document within this Recommendation does
not give it, as a stand-alone document, the status of a Recommendation.
[ITU-T G.652] Recommendation ITU-T G.652 (2009), Characteristics of a single-mode optical
fibre and cable.
[ITU-T G.693] Recommendation ITU-T G.693 (2009), Optical interfaces for intra-office
systems.

[ITU-T G.695] Recommendation ITU-T G.695 (2015), Optical interfaces for coarse wavelength
division multiplexing applications.

[ITU-T G.698.1] Recommendation ITU-T G.698.1 (2009), Multichannel DWDM applications with
single-channel optical interfaces.

[ITU-T G.698.2] Recommendation ITU-T G.698.2 (2009), Amplified multichannel dense
wavelength division multiplexing applications with single channel optical
interfaces.
[ITU-T G.698.3] Recommendation ITU-T G.698.3 (2012), Multichannel seeded DWDM
applications with single-channel optical interfaces.

[ITU-T G.707] Recommendation ITU-T G.707/Y.1322 (2007), Network node interface for the
synchronous digital hierarchy (SDH).

[ITU-T G.780] Recommendation ITU-T G.780/Y.1351 (2010), Terms and definitions for
synchronous digital hierarchy (SDH) networks.

[ITU-T G.798] Recommendation ITU-T G.798 (2012), Characteristics of optical transport
network hierarchy equipment functional blocks.
[ITU-T G.805] Recommendation ITU-T G.805 (2000), Generic functional architecture of
transport networks.

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