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OPERATIONS, ADMINISTRATION AND MANAGEMENT ENHANCEMENT FOR OPTICAL TRANSPORT NETWORKS

IP.com Disclosure Number: IPCOM000250261D
Publication Date: 2017-Jun-20
Document File: 12 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Related People

Praveen Kumar: AUTHOR [+3]

Abstract

Techniques are provided to resolve existing optical transport network (OTN) operations, administration and management (OAM) challenges for operators. These techniques tremendously simplify the use of OAM in OTNs.

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Copyright 2017 Cisco Systems, Inc. 1

OPERATIONS, ADMINISTRATION AND MANAGEMENT ENHANCEMENT FOR OPTICAL TRANSPORT NETWORKS

AUTHORS: Praveen Kumar Navdeep Sood Ankur Govil

CISCO SYSTEMS, INC.

ABSTRACT

Techniques are provided to resolve existing optical transport network (OTN)

operations, administration and management (OAM) challenges for operators. These

techniques tremendously simplify the use of OAM in OTNs.

DETAILED DESCRIPTION

As shown in Table 1 below, optical transport networks (OTNs) are growing in

capacity from Optical Transport Unit (OTU) 1 (1.25 Gbps) to OTU2 (10.7 Gbps) to OTU-

Cn (multiples of 100Gbps).

OTU type OTU nominal bit rate OTU bit-rate tolerance OTU1 255/238 × 2 488 320 kbit/s +/-20 ppm

OTU2 255/237 × 9 953 280 kbit/s OTU3 255/236 × 39 813 120 kbit/s OTU4 255/227 × 99 532 800 kbit/s OTUCn n × 239/226 × 99 532 800 kbit/s

Table 1

Similarly, the OTN switching hierarchy has now transformed to various levels of

Optical Data Units (ODUs) (e.g., ODUCn, ODU4, ODU3, ODU2, ODU1, ODU-LO, etc.)

to accommodate a wide variety of client signals directly, as shown in Table 2 below.

Copyright 2017 Cisco Systems, Inc. 2

ODU types and bit rates ODU type

ODU nominal bit rate ODU bit-rate tolerance

ODU0 1 244 160 kbit/s +/-20 ppm

ODU1 239/238 × 2 488 320 kbit/s +/-20 ppm ODU2 239/237 × 9 953 280 kbit/s +/-20 ppm ODU3 239/236 × 39 813 120 kbit/s +/-20 ppm ODU4 239/227 × 99 532 800 kbit/s +/-20 ppm ODUCn n × 239/226 × 99 532 800 kbit/s +/-20 ppm ODU2e 239/237 × 10 312 500 kbit/s +/-100 ppm ODUflex for Constant Bitrate (CBR) client signals

239/238 × client signal bit rate +/-100 ppm

ODUflex for Generic Framing Procedure - Framed (GFP-F) mapped client signals

Configured bit rate (see Table 7- 8)

+/-100 ppm

ODUflex for Interface Message Processor (IMP) mapped client signals

s × 239/238 × 5 156 250 kbit/s s = 2, 8, n × 5 with n ≥ 1 (Note 4)

+/-100 ppm

ODUflex for Flex Ethernet (FlexE)-aware client signals

103 125 000 × 240/238 × n/20 kbit/s (n = n1 + n2 + ... + np)

+/- 100 ppm

Table 2

Each ODUk layer has associated operations, administration and management

(OAM) overhead bits in OTN (e.g., Bit-Interleaved Parity (BIP) monitoring via ODUk

Parity Monitoring (PM) overheads for the ODU layer entities provided above, sub-layer

monitoring via Tandem Connection Monitoring (TCM) overheads, Trail Trace Identifier

(TTI) monitoring function at Section Layer, PM layer and TCM layer, etc.). TCM, for

example, has six levels for monitoring in each ODU layer to accommodate sub-layer

monitoring across network segments.

These multiple levels of OAM have introduced associated challenges to service

providers, where network management is becoming increasingly complex. Figure 1 below

illustrates an example scenario that poses an OAM management challenge in a multi-

vendor interoperation environment (OTN network).

Copyright 2017 Cisco Systems, Inc. 3

Figure 1

The available network monitoring options include: OTUk layer monitoring options

as point to point SM Operator A OA...