The Cisco® ONS 15454 Multiservice Transport Platform (MSTP) supports an Extended Performance 4-Port 2.5-Gbps Full-Band Tunable Muxponder Card, which expands the platform's OC-48/STM-16 interface density. The card facilitates the delivery of transparent 2.5-Gbps-based services for enterprises or service provider optical networks (Figure 1).
Cisco ONS 15454 MSTP Release 9.1 extends the capabilities of this card with an enhanced-performance optical trunk module, which implements an Electronic Dispersion Compensation (EDC) mechanism based on the Maximum Likelihood Sequence Estimation (MLSE) algorithm to improve chromatic dispersion (CD) and polarization-mode dispersion (PMD) robustness.
Optical transport networks must support numerous service demands, from low-rate DS-1/T1, DS-3/E3, 10/100BASE-T, and OC-3/STM-1 to higher-rate OC-12/STM-4, Gigabit Ethernet, OC-48/STM-16, OC-192/STM-64, and 10 Gigabit Ethernet services. In the recent past, SONET add-drop multiplexers (ADMs) provided the services platform to aggregate and transport services up to OC-48/STM-16, whereas dense wavelength-division multiplexing (DWDM) platforms were designed for optical signals from OC-3/STM-1 to OC-192/STM-64, including Gigabit and 10 Gigabit Ethernet. Unfortunately, deploying multiple platforms (including DWDM and SONET ADMs) to support multiple services is not cost-effective for many service provider and enterprise networks. The Cisco ONS 15454 MSTP with a muxponder card provides a more cost-effective networking solution to enable the delivery of all services, from lower-speed DS-1/E1, high-density 2.5 Gbps, and high bandwidth OC-192/STM-64.
The Cisco ONS 15454 MSTP Extended Performance 4-Port 2.5-Gbps Full-Band Tunable Muxponder Card can transport four OC-48/STM-16 payloads over a G.709 OTU-2-based, 50-GHz spaced, 50-GHz stabilized, ITU-compliant wavelength with selectable Enhanced Forward Error Correction (E-FEC). The muxponder card is a plug-in module to the Cisco ONS 15454 MSTP, enabling a high-density, cost-effective solution for OC-48/STM-16 services transport over a platform capable of low-rate services down to 1.5 Mbps. The muxponder card architecture contains four client interfaces that are mapped to a single line interface, without accessing the Cisco ONS 15454 shelf cross-connect fabric.
Each client interface provides a 2.488-Mbps (OC-48/STM-16) SONET/SDH interface through a Small Form-Factor Pluggable (SFP) optics module with LC connectors, providing the flexibility to support several optical reaches, including short-reach/intra-office, intermediate-reach/short-haul, and long-reach/long-haul, with support for qualified SFP modules. The muxponder card supports any mixture of SFP reach types and also supports in-service insertion or removal without affecting other active ports, allowing superior networking flexibility and simplified deployment.
The DWDM line interface provides one 10.70923-Gbps G.709 OTU-2 digital wrapper, long-reach/long-haul, ITU-compliant, 50-GHz spaced optical interface using LC connectors supporting G.709 OTU-2 digital wrapper interfaces. The DWDM output line interface is tunable across full optical C band, dramatically reducing inventories for spares. When operating within the outlined specifications, each card will transport each of the 2.5-Gbps signals with a maximum bit error rate (BER) of 10E-15.
The integrated MLSE-based Electronic Dispersion Compensation extends DWDM network performances, providing support to the following applications:
• High PMD fiber applications: MLSE technology can monitor and correct errors due to time variant effects
• Low-latency data center applications: SAN protocols, such as Server Time Protocol (STP), are extremely sensitive to additional latency introduced by CD optical fiber.
• Enterprise point-to-point applications: Installation costs for the dispersion compensation unit (DCU) and fiber can be avoided. This is particularly important in low-end markets, where DCU can comprise up to 10 percent of simple point-to-point systems cost.
• Ultra-long-haul (ULH) applications: Improvement in CD and PMD performance can be translated in better ULH performance. Additional OSNR margin can be allocated to compensate for non-linear effects (NLE) impairment, allowing for better system performance.
The muxponder card incorporates the four clients and one DWDM line interface on the same card. The muxponder cards are deployable in the 12 multiservice interface card slots of the Cisco ONS 15454 platform, in systems with or without cross-connect cards. The addition of a cross-connect card enables the platform to support hybrid applications containing transparent 2.5-Gbps services, and allows aggregation of the other services supported by the Cisco ONS 15454 platform. The only other common card required for operation is the timing, communications, and control card (TCC).
The muxponder card provides many carrier-class features and capabilities necessary to deliver 2.5-Gbps services, including selectable protocol transparency, wavelength tunability, flexible protection mechanisms, flexible timing options, and management capabilities.
Enhanced FEC Capability
An important feature of the enhanced muxponder card is the ability to configure the FEC in two modes: FEC and Enhanced FEC (E-FEC). The output bit rate will be always 10.7092 Gbps as defined in G.709 but the error coding performance can be provisioned:
• FEC: standard G.975 Reed-Salomon algorithm
• E-FEC: standard G.975.1 two orthogonally concatenated BCH super FEC codes. This FEC scheme contains three parameterizations of the same scheme of two orthogonally interleaved block codes (BCH).
The constructed code is decoded iteratively, to achieve the expected performance. E-FEC provides 2 dB of additional reach when compared to standard FEC.
The Full-Band Tunable Muxponder Card provides the capability to deliver transparent 2.5-Gbps wavelength services, OC-48/STM-16 terminated signals, and provides a high-density solution for cost-effective, point-to-point SONET/SDH payload transport for the Cisco ONS 15454 platform. The card can be provisioned to either pass all the SONET/SDH overhead bytes transparently or to terminate the line and section overhead. In transparent mode, client terminal equipment interconnected over a muxponder-card-based circuit can communicate over the section/multiplexer section data communications channel (SDCC/MSDCC), can signal 1+1 and bidirectional line switched ring/multiplex section shared protection ring (BLSR/MS-SPR) protection switching using the K1 and K2 bytes, and can support provisionable section trace capabilities over the J0 byte. In addition, the muxponder circuit, whether provisioned in transparent or terminating mode, can support unidirectional path switched ring/subnetwork connection protection (UPSR/SNCP)-based client circuits. Full transparency is provided by the enhanced multiplex engine, which performs the multiplexing of the incoming 2.5-Gbps signals at the OTN layer that are no longer in the SONET/SDH domain. Each of the 4 x OC-48/STM-16 streams are mapped into a fully standard ODU-1 encapsulation and then the 4 x ODU-1 are multiplexed into an ODU-2 envelope to be transmitted in a fully standard G.709 OTU-2 frame.
The client interfaces can support non-concatenated SONET/SDH payloads on an STS-1, VC-4, VC-12, and VT1.5 basis, as well as concatenated SONET/SDH payloads (STS-Nc, N = 3, 6, 9, 12, 24, or 48; or VC-4-Mc, M = 1, 2, 3, 4, 8, or 16).
The muxponder cards operate on the 50-GHz ITU grid and are tunable across 82 adjacent 50-GHz channels for the C-band module and across 80 adjacent 50-GHz channels for the L-band module. The incorporation of tunability into the muxponder cards reduces the amount of inventory and spares required to cover all of the wavelengths. Tunability is software-provisionable.
Flexible Protection Mechanism Support
The muxponder card, depending upon the requirement of the network, can be deployed to support the many protection mechanisms found in optical transport networks. Table 1 outlines the supported protection options that help to deliver the service-level agreements (SLAs) required by the application.
Table 1. Protection Formats
No client terminal interface, muxponder card, or DWDM line protection. The client signal is transported over a single unprotected muxponder card.
1+1 protection or UPSR/SNCP and BLSR/MSP-SPR
Provides protection for the client terminal interface, muxponder card, and DWDM line through client automatic protection switching/linear multiplex section protection (APS/LMSP) signaling transported transparently over the muxponder card.
Similar to unprotected format. Protection is provided through client line or path protection via transparent signal transport through muxponder circuit.
Provides muxponder card and DWDM line protection without requiring client terminal equipment interface protection. Uses Y-protection device to optically split a single client interface to two muxponder cards. The Cisco ONS 15454 system controls the muxponder card active/standby status to provide a single signal feed to client equipment.
Figure 2. Unprotected Configuration
Figure 3. 1+1 Protection Configuration
Figure 4. UPSR/SNCP and BLSR/MSP-SPR Protection Configuration
Figure 5. Y-Cable Configuration
Flexible Timing Options
The Full-Band Tunable Muxponder Card times the client side and the DWDM line optical transmitter port with the clock derivate by the shelf processor. The Cisco ONS 15454 platform provides the option to recover timing signals for node-timing reference, with sync status messaging support, from any of the four client optical interfaces, in addition to the standard options of using an external clock derived from a building integrated timing supply (BITS) clock or another optical interface card on the Cisco ONS 15454 system. The muxponder card can also maintain synchronization from one of the available clients even if both the shelf processors (active and standby) fail.
The Cisco ONS 15454 provides comprehensive management capabilities for operations, administration, monitoring, and provisioning (OAM&P) accessed through the integrated Cisco Transport Controller craft interface with support from the Cisco Transport Manager element management system (EMS). The muxponder card incorporates provisionable digital wrapper (G.709) functions, providing DWDM wavelength performance-management capabilities, especially for services being transported transparently across the network. Without the digital wrapper function, a carrier transporting a service transparently would be unable to identify network impairments that may degrade the transported signal and exceed SLA requirements. The digital wrapper's general communications channel (GCC) provides a separate communications channel, versus the section data communications channel (DCC)/regenerator SDCC (SDCC/RSDCC) in SONET/SDH signals, to be used by the platform when transparent signals are transported. This GCC enables the Cisco ONS 15454 to extend its advanced network auto-discovery capabilities to DWDM-based services. The integrated Cisco Transport Controller craft manager and the Cisco Transport Manager EMS provide the user with OAM&P access for the system.
Configurable Far-End-Laser-Off Behavior
The Full-Band Tunable Enhanced Muxponder Card offers the capability to provision the Far-End-Laser-Off behavior. You can use Cisco Transport Controller to configure how the remote client interface will behave following a fault condition. It is possible to configure the remote client to squelch or to send an alarm indication signal (AIS).
The performance monitoring capabilities of the muxponder card provide support for both transparent and nontransparent signal transport. For SONET/SDH signals, standard performance monitoring, threshold-crossing conditions, and alarms are supported per Telcordia GR-474 and GR-2918, as well as ITU G.783 and ETS 300 417-1 standards. Each digital wrapper channel will be monitored per G.709 (OTN). Optical parameters on the client and DWDM line interfaces support loss of signal (LOS), laser bias current, transmit optical power, and receive optical power. Calculation and accumulation of the performance monitoring data is in 15-minute and 24-hour intervals as per G.7710.
The muxponder card incorporates faceplate-mounted LEDs to provide a quick visual check of the operational status of the card. An orange circle is printed on the faceplate, indicating the shelf slot in which the card can be installed.
The Full-Band Tunable Muxponder Card adds the capability to cost-effectively aggregate 2.5-Gbps services and transport them with or without overhead transparency. Figure 6 displays a typical service provider backbone network application. The muxponder card on the Cisco ONS 15454 network enables the transport of the four services or termination of the SONET/SDH overhead of the four streams, or it is possible to have them transparently pass through service provider A's network.
Figure 6. High-Density OC-48/STM-16 Transport
As well as transporting 2.5-Gbps service, the user can deliver a mixture of service types, from DS-1/E1 to 10-Gbps services, using a common Cisco ONS 15454 transport platform. This capability helps reduce system complexity, capital expenditures, and operational expenses related to technician training.
Features and Specifications
• Single-width card slot design for high-density, 4x 2.5-Gbps solutions
• Up to 12 muxponder cards per shelf assembly enables up to 192 2.5-Gbps interface per bay frame
Flexible Restoration Options
• Transparent support for UPSR/SNCP, BLSR/MSP, and 1+1 APS/MSP
• Client Y-protection
• Unprotected (0+1)
Tables 2 and 3 list regulatory compliance information and system requirements for the muxponder card. Tables 4 through 7 list product specifications and Table 8 provides ordering information.
Full Tunable from 1529.55 to 1561.84 (C-Band - 50 GHz)
Spectral width at 20 dB (lD20)
Lithium-Niobate external modulator
Output power (PTmin to PTmax)
+3 dBm, +6 dBm
Required optical return loss, minimum (ORLmin)
Extinction ratio, minimum (reminx)
Laser safety class
Avalanche photo diode (APD)
Chromatic dispersion tolerance (DLRmax)
Up to ±4000 ps/nm
Minimum BER (BERmin)
• FEC on
• E-FEC on
Reflectance between far-end Tx and near-end Rx (maximum)
Receiver reflectance (maximum)
Input wavelength bandwidth (lc_rx)
1290 nm to 1605 nm
Connector type (Tx/Rx)
LC, duplex (shuttered)
Table 6. DWDM Receive-Side Optical Performances
Input Power Sensitivity
-8 to -20 dBm
+/- 800 ps/nm
+/- 1600 ps/nm
-8 to -27 dBm
+/- 2000 ps/nm
-8 to -26 dBm
+/- 2000 ps/nm
-8 to -25 dBm
At 11.1 Gbps
-8 to -20 dBm
+/- 1500 ps/nm
-2000 / 2500 ps/nm
+/- 1500 ps/nm
-2000 / 2500 ps/nm
-3000 / 4000 ps/nm
+/- 4000 ps/nm
1. Average PMD
Table 7. Card Specifications
• Failure (FAIL)
• Active/standby (ACT/STBY)
• Signal fail (SF)
Client port LEDs (per port)
• Active input signal
DWDM port LEDs
• Active input signal
• Output wavelength
Power (including worst-case pluggable)
Occupies one slot
1.4 Kg (3.1 lbs)
Reliability and Availability
Mean time between failure (MTBF)
Latency (End to End)
G.709 Off / NO FEC:
G.709 On - Standard FEC
G.709 On - Enhanced FEC
-40ºC to 70ºC (-40ºF to 158ºF)
• Short term1
0ºC to 40°C (32°F to 104°F)
-5ºC to 55ºC (23ºF to 131ºF)
• Short term1
5% to 85%, non condensing
5% to 90% but not to exceed 0.024 kg water/kg of dry air
1. Short-term refers to a period of not more than 96 consecutive hours and a total of not more than 15 days in 1 year. (This refers to a total of 360 hours in any given year, but no more than 15 occurrences during that 1-year period.)
Table 8. Ordering Information
Extended performance 4-port OC-48/STM-16 EFEC muxponder card, 4 SFP-based client interfaces, full C-band tunable on 50-GHz ITU wavelengths, DWDM line with LC connectors
NOTE: Transponders equipped with LR2 XFP need to be placed in a high-speed slot (5,6,12, or 13) if shelf is equipped with FTA-3 or FTA-48V fan tray. No limitation if the shelf is using CC-FTA fan tray.
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1All compliance documentation may not be completed at the time of product release. Please check with your Cisco sales representative for countries outside of Canada, the United States, and the European Union.