Cisco Cisco CRS-X Multishelf System Data Sheet
© 2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.
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The new interface module is designed to provide the following benefits:
●
Transport of 100-Gbps wavelengths over fully uncompensated networks, up to 3000 km of unregenerated
optical links
●
Transport at 100 Gbps over very low-quality fiber with very high Polarization Mode Dispersion (PMD)
●
Transport of 100-Gbps wavelengths over existing 50-GHz channel spacing with very high tolerance to
filtering penalties
This module helps service providers increase efficiency, improve reliability, and reduce operational and capital
costs by eliminating expensive and bulky optical transponder equipment.
Enhanced Forward Error Correction Capability
This module can support a Forward Error Correction (FEC) mechanism. The trunk port supports three software-
configurable FEC coding options.
●
Generic FEC (GFEC): Standard G.975 Reed-Salomon algorithm with 7 percent overhead.
●
Ultra FEC (UFEC): Standard G.975.1 (Sub-clause I.7) with 20 percent overhead. This FEC scheme uses
two orthogonally concatenated BCH Enhanced FEC (EFEC) codes. The constructed code is decoded
iteratively to rebuild the original frame.
●
High-Gain FEC (HG-FEC): High-Gain EFEC with 7 percent overhead, providing better performances than
standard G.975.1 7 percent OH FEC. Because of the reduced overhead and lower bit rate, HG-FEC is
suitable for all the applications where 100 Gbps wavelengths are passing through a high number of
reconfigurable optical add-drop multiplexer (ROADM) nodes with limited pass-band performances.
The different FEC modes extend the reach of the DWDM signal up to 3000 km without requiring signal
regeneration. For more information about the Cisco CRS or about other interfaces available for the Cisco CRS,
visit:
Protocol Transparency
The module can transparently deliver any 100-Gbps services for cost-effective, point-to-point networking for the
Cisco CRS platform (see Table 1).
Table 1.
Transponder Client Configurations and Mapping
Client
Mapping
Trunk
Format
Rate (Gbps)
Format
Rate with 7% GFEC
or EFEC OH (Gbps)
or EFEC OH (Gbps)
Rate with 20%
UFEC OH (Gbps)
UFEC OH (Gbps)
100GE LAN-PHY
101.125
Bit transparent through standard G.709v3
mapping
mapping
OTU-4
111.809
124.964
OTU-4
111.809
Transparent G.709 standard