Page 636 - 5G Basics - Core Network Aspects

2 Transport aspects

1 Scope
This Supplement describes alternatives for mapping and multiplexing common public radio interface (CPRI)
client signals into the optical transport network (OTN). Other viable means of carrying CPRI over OTN are
known to exist and this Supplement is intended to give examples only. It is not intended to provide an
exhaustive list of alternatives. The alternatives in this Supplement are for various applications and
requirements. Some are based on new methods and others are to explain how to use standardized tools for
carrying CPRI over OTN. The mappings in this Supplement include direct mappings for native CPRI client
signals and mappings that apply transcoding in order to gain bandwidth efficiency. This Supplement relates
to [ITU-T G.872], [ITU-T G.709], [ITU-T G.798] and [ITU-T G.959.1].

2 References

[ITU-T G.709] Recommendation ITU-T G.709/Y.1331 (2012), Interfaces for the optical transport
network.

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

[ITU-T G.806] Recommendation ITU-T G.806 (2012), Characteristics of transport equipment –
Description methodology and generic functionality.

[ITU-T G.872] Recommendation ITU-T G.872 (2012), Architecture of optical transport networks.
[ITU-T G.959.1] Recommendation ITU-T G.959.1 (2016), Optical transport network physical layer
interfaces.

ITU-T G.7041] Recommendation ITU-T G.7041/Y.1303 (2016), Generic framing procedure.
[CPRI] CPRI Specification V7.0 (2015), Common public radio interface (CPRI), interface
specification. <http://www.cpri.info/downloads/CPRI_v_7_0_2015-10-09.pdf>

3 Definitions
None.

4 Abbreviations and acronyms
This Supplement uses the following abbreviations and acronyms:

AIS Alarm Indication Signal
AMP Asynchronous Mapping Procedure

BaFN Basic Frame Number
BFP Basic Frame Pointer
CBR Constant Bit Rate

CID Channel ID
CPRI Common Public Radio Interface

CSF Client Signal Fail
FEC Forward Error Correction

GFP-T Transparent Generic Framing Procedure
GMP Generic Mapping Procedure

HO High Order
LO Low Order

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