Optical Cross-Connect Generic Requirements
Document Number GR-3009
Issue Number 03
Issue Date Dec 2001
ABSTRACT: Issue 3 of Optical Cross-Connect Generic Requirements, replaces Issue 2.
The potential of multiwavelength optical networking to provide flexible and format independent high-capacity transport has been
known for some time. Capacity exhaust and exponential growth in demand have only recently resulted in rapid commercialization and
deployment of dense wavelength division multiplexed (DWDM) transport systems. Point-to-point DWDM systems were deployed initially to
relieve fiber exhaust problems. Subsequently, optical network elements (ONEs) that provide optical networking functions such as fixed
optical add/drop became commercially available.
Recently, a number of products that provide reconfigurable optical add/drop and optical cross-connection capability have also become
available commercially. The reconfigurable optical add/drop multiplexer (OADM) and the optical cross-connect (OXC) will enable
high-capacity Optical Layer Network (OLN) or Optical Transport Networks (OTNs) where the optical connectivity is remotely
reconfigurable. The Optical Layer Network (OLN) and its client signals have three transport layer networks, namely, the Optical Channel
(OCh) path layer network, the Optical Multiplex Section (OMS) layer network, and the Optical Transmission Section (OTS) layer network.
The Optical Transport Network (OTN) supports layers above the OLN in addition to the OLN transport layers, namely, the Optical channel
Payload Unit (OPU), the Optical channel Data Unit (ODU), and the Optical channel Transport Unit (OTU) layer.
This GR provides the Telcordia view of generic requirements for the functional characteristics of optical cross-connects that are
network elements capable of cross-connecting single wavelength and/or multiwavelength optical signals. The generic requirements in this
GR are based on current national and international standardization efforts and funding members' input. This document contains generic
criteria intended to enable interoperable OXCs that can be used in multivendor OLN/OTNs.
The purpose of this document is to promote the development of interoperable OXCs for use in future multivendor OLN/OTNs.
Interoperable OXCs from different vendors can be seamlessly interconnected as the service provider OLN/OTN evolves. OXCs that comply to
this document will have the minimal functionality necessary for use in service provider networks. Compliance to this document helps to
ensure vendors that their OXCs meet service provider needs without preventing them from providing additional functions to differentiate
This issue of the GR covers generic functional requirements for the fiber cross-connect (FXC), the wavelength selective
cross-connect (WSXC), the wavelength interchanging cross-connect, the WSXC/WIXC hybrid cross-connect, and the FXC/WSXC hybrid
cross-connect. This GR should be used in conjunction with other appropriate documents such as GR-2918, GR-2979, G.7090, G.798,
G.872 and G.841 series.
Issue 3 of GR-3009 replaces Issue 2. Comments from the TTF funders and standards developments have been considered and used in
formulating the criteria provided in this document. Changes have been made in Sections 2, 4, and 5.
When using GR-3009, you may need to refer to GR-2918, GR-2979, GR-253, GR-418, GR-474, GR-815, GR-1093,
GR-1250, GR-1312, GR-2963, GR-2998, and/or ANSI T1.233 and T1.243. You may also want to refer to GR-828,
TR-NWT-000835, GR-1469, and ITU-T Recommendations G.7090, G.798, G.872 and G.841.
Components of this product are:
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