Page 1097 - 5G Basics - Core Network Aspects

Transport aspects 2

[IEEE 802.3by] IEEE Std. 802.3by:2016, IEEE Standard for Ethernet – Amendment 2: Media
Access Control Parameters, Physical Layers, and Management Parameters for
25 Gb/s Operation.
[OIF FlexE IA] OIF, Flex Ethernet Implementation Agreement (2016).

3 Definitions

3.1 Terms defined elsewhere

This Recommendation uses the following terms defined elsewhere:
3.1.1 Terms defined in [ITU-T G.780]:
– BIP-X

– network node interface
3.1.2 Terms defined in [ITU-T G.805]:
– adapted information (AI)
– characteristic information (CI)
– network

– subnetwork
3.1.4 Terms defined in [ITU-T G.872]:
– optical multiplex section (OMS)
– optical transmission section (OTS)

3.1.5 Terms defined in [ITU-T G.959.1]:
– optical tributary signal (OTSi).

3.2 Terms defined in this Recommendation

This Recommendation defines the following terms:
3.2.1 ODUk.ts: The ODUk.ts is an increment of bandwidth which when multiplied by a number of
tributary slots gives the recommended size of an ODUflex(GFP) optimized to occupy a given number of
tributary slots of an OPUk.

3.2.2 OTU0 low latency: The OTU0 low latency (OTU0LL) is the information structure used for transport
of an ODU0 over a multi-vendor optical network interface in one administrative domain at the edge of the
optical transport network.
NOTE – The OTU0LL is not transported over an SOTU, MOTUm, MOTU.

3.2.3 optical tributary signal assembly (OTSiA): The OTSiG together with the non-associated overhead
(OTSiG-O).

3.2.4 optical tributary signal group (OTSiG): The set of OTSi signals that supports an OTU.
3.2.5 optical tributary signal overhead (OTSiG-O): The non-associated overhead for an OTSiG.

3.2.6 connection monitoring end-point (CMEP): Connection monitoring end-points represent
end-points of trails and correspond as such with the trail termination functions. Connection monitoring
overhead (CMOH) is inserted and extracted at the CMEPs.
For the ODU and OTU the CMEPs are categorized in three classes:

– OTU section CMEP (OS_CMEP), which represents the end-points of the OTUk/OTUCn trail. The SM
overhead field contains the related CMOH.
– ODU tandem connection CMEP (TC_CMEP), which represents the end-points of ODUkT/ODUCnT
trails. The TCM1..6 overhead fields contain the related CMOH.

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