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Cisco ONS 15454 DWDM Reference Manual, R8.5
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Chapter 8 Transponder and Muxponder Cards
8.10.1 Key Features
The throughput of the MXP_MR_10DME_C and MXP_MR_10DME_L cards is affected by the
following parameters:
• Distance extension—If distance extension is enabled on the card, it provides more throughput but
more latency. If distance extension is disabled on the card, the buffer to buffer credits on the storage
switch affects the throughput; higher the buffer to buffer credits higher is the throughput.
Note For each link to operate at the maximum throughput, it requires a minimum number of buffer
credits to be available on the devices which the link connects to. The number of buffer
credits required is a function of the distance between the storage switch extension ports and
the link bandwidth, that is, 1G, 2G, or 4G. These buffer credits are provided by either the
storage switch (if distance extension is disabled) or by both the storage switch and the card
(if distance extension is enabled).
• Forward Error Correction (FEC)—If Enhanced FEC (E-FEC) is enabled on the trunk port of the
card, the throughout is significantly reduced in comparison to standard FEC being set on the trunk
port.
Note If distance extension is enabled on the card, the FEC status does not usually affect the
throughput of the card.
• Payload size—The throughput of the card decreases with decrease in payload size.
The resultant throughput of the card is usually the combined effect of the above parameters.
8.10.1 Key Features
The MXP_MR_10DME_C and MXP_MR_10DME_L cards have the following high-level features:
• Onboard E-FEC processor: The processor supports both standard RS (specified in ITU-T G.709) and
E-FEC, which allows an improved gain on trunk interfaces with a resultant extension of the
transmission range on these interfaces. The E-FEC functionality increases the correction capability
of the transponder to improve performance, allowing operation at a lower OSNR compared to the
standard RS (237,255) correction algorithm. A new BCH algorithm implemented in E-FEC allows
recovery of an input BER up to 1E-3.
• Pluggable client interface optic modules: The MXP_MR_10DME_C and MXP_MR_10DME_L
cards have modular interfaces. Two types of optics modules can be plugged into the card. These
include an OC-48/STM 16 SR-1 interface with a 7-km (4.3-mile) nominal range (for short range and
intra-office applications) and an IR-1 interface with a range up to 40 km (24.9 miles). SR-1 is
defined in Telcordia GR-253-CORE and in I-16 (ITU-T G.957). IR-1 is defined in Telcordia
GR-253-CORE and in S-16-1 (ITU-T G.957).
• Y-cable protection: Supports Y-cable protection between the same card type only, on ports with the
same port number and signal rate. See the “8.13.1 Y-Cable Protection” section on page 8-75 for
more detailed information.
• High level provisioning support: The cards are initially provisioned using Cisco TransportPlanner
software. Subsequently, the card can be monitored and provisioned using CTC software.
• ALS: A safety mechanism used in the event of a fiber cut. For details regarding ALS provisioning
for the MXP_MR_10DME_C and MXP_MR_10DME_L cards, refer to the Cisco ONS 15454
DWDM Procedure Guide.
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