Troubleshooting guide

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Release Notes for Cisco ONS 15454 Release 7.0.2
OL-11368-01
New Features and Functionality
The maximum system reach in filterless applications without the use of optical amplification or
regenerators is nominally rated at 23 dB over C-SMF fiber. This rating is not a product specification, but
is given for informational purposes. It is subject to change.
Y-Cable Protection
The TXP_MR_10E card supports Y-cable protection, which provides transponder equipment protection
without client terminal equipment interface protection. A single client interface can be split between two
transponder cards using a Y-protection device.
With Y-cable protection, two TXP_MR_10E_C or two TXP_MR_10E_L transponder cards can be
joined in a Y-cable protection group. In Y-cable protection, the client ports of the two cards are joined
by Y cables. An incoming client signal is injected into the Rx Y-cable port and is split between the two
cards (connected to Rx client ports) in the protection group. The Tx client signals from the two
protection group cards are connected to the correspondent ports of the Tx Y cable. Only the Tx client
port of the active card is turned on and transmits the signal towards the receiving client equipment.
If you create a GCC using a digital wrapper and apply it to either card of the Y-cable protect group, the
DWDM trunk (span) port stays permanently active, regardless of the switch state. When you provision
a GCC, you are provisioning unprotected overhead (OH) bytes. The GCC is not protected by the
protection group.
Enhanced FEC Feature
A key feature of the TXP_MR_10E_C and TXP_MR_10E_L cards is the availability to configure the
forward error correction in three modes: NO FEC, FEC, and Enhanced FEC (E-FEC). The output bit rate
is always 10.7092 Gbps as defined in ITU-T G.709, but the error coding performance can be provisioned
as follows:
• NO FEC—No forward error correction
• FEC—Standard ITU-T G.975 Reed-Solomon algorithm
• E-FEC—Standard ITU-T G.975.1 algorithm, which is a super FEC code.
FEC and E-FEC Modes
As client side traffic passes through the TXP_MR_10E_C and TXP_MR_10E_L cards, it can be digitally
wrapped using FEC mode, E-FEC mode, or no error correction at all. The FEC mode setting provides a
lower level of error detection and correction than the E-FEC mode setting of the card. As a result, using
E-FEC mode allows higher sensitivity (lower OSNR) with a lower bit error rate than FEC mode. E-FEC
enables longer distance trunk-side transmission than with FEC.
The E-FEC feature is one of three basic modes of FEC operation. FEC can be turned off, FEC can be
turned on, or E-FEC can be turned on to provide greater range and lower BER. The default mode is FEC
on and E-FEC off. E-FEC is provisioned using CTC.
Because the transponder has no visibility into the data payload and detect circuits, the TXP_MR_10E_C
and TXP_MR_10E_L cards do not display circuits under the card view.
Client-to-Trunk Mapping
The TXP_MR_10E_C and TXP_MR_10E_L cards can perform ODU2-to-OCh mapping, which allows
operators to provision data payloads in a standard way across 10-Gbps optical links.