The Cisco® ONS 15454 Multiservice Transport Platform (MSTP) support for a 4-Port 2.5-Gbps Full-Band Tunable Enhanced Muxponder Card for the Cisco ONS 15454 Multiservice Transport Platform (MSTP) expands the Cisco ONS platform's OC-48/STM-16 interface density. The card facilitates the delivery of transparent 2.5-Gbps-based services for enterprises or metropolitan-area (metro) and regional service provider networks (Figure 1).
Metro 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 metro 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 metro 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 4-Port 2.5-Gbps Full-Band Tunable Muxponder Card can transport four OC-48/STM-16 payloads over a G.709 OUT-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 reduced pre-planning activities.
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 or L band, dramatically reducing inventories for spares. When operated 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 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 as well as 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 (TCC) card.
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 3 modes: NO FEC, FEC, and 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:
• NO FEC: no Forward Error Correction
• FEC: standard G.975 Reed-Salomon algorithm
• E-FEC: standard G.975.1 two orthogonally concatenated BCH super FEC code. 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 gains 2 dB respect standard FEC.
Selectable Protocol Transparency
The Full-Band Tunable Muxponder Card provides the capability to deliver "transparent" 2.5-Gbps wavelength services, OC-48/STM-16 terminated signals, and a high-density solution for cost-effective, point-to-point SONET/SDH payload transport for the Cisco ONS 15454 platform. The card is provisionable 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 that performs the multiplexing of the incoming 2.5-Gbps signal at OTN layer not any more 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 format.
The client interfaces can support nonconcatenated 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 dramatically reduces the customer's inventory required to cover all the system wavelengths.
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
Offers 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 protection 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.
UPSR/SNCP and BLSR/MSP-SPR Protection
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 communication channel (GCC) provides a separate communications channel, versus the section DCC/regenerator section DCC (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 autodiscovery 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 4 streams, or it is possible to have them transparently pass through service provider A's network.
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, reducing system complexity, capital expenditures, and operational expenses related to technician training.
The Cisco Advantage
The Cisco ONS 15454 Full-Band Tunable Muxponder Card complements and extends the service capabilities of the Cisco ONS 15454 MSTP. The muxponder card allows users to take advantage of their existing fiber plant and installed base of Cisco ONS 15454 systems, while providing the required services, such as DS-1/E1, DS-3/E3, OC-n/STM-n, Ethernet, ATM, and video over the same Cisco ONS 15454 platform. The muxponder solution improves the Cisco ONS 15454 platform's 2.5-Gbps service densities while reducing the networking costs associated with the typical deployment option of an overlay metro DWDM platform to transport a mixture of services (Figures 7 and 8).
Today's DWDM Architecture
Cisco ONS 15454/ONS 15216 Hybrid DWDM Architecture
The Cisco ONS 15454 optical transport solution offers significant advantages over traditional network elements offering 10-Gbps interfaces, including the following:
Unprecedented Service Densities
The Cisco ONS 15454 platform supports up to 48 2.5-Gbps interfaces per shelf. When the platform is installed in a typical central office bay frame, a bay can support up to 192 2.5-Gbps interfaces. These industry-leading densities are attainable because of the single-slot footprint of the muxponder interface card.
Multiple Restoration Types
The Cisco ONS 15454 platform supports 2- or 4-fiber BLSR/MS-SPR, UPSR/SNCP, linear APS/MSP, and path-protected mesh networking (PPMN). This allows the service provider to deploy the platform in all areas of the transport networking applications, including the interoffice network, normally deployed using 2- or 4-fiber BLSR/MS-SPR restoration, as well as the collector or fiber to the building networks, normally using UPSR/SNCP restoration.
Common Line Cards and Chassis
Optical line cards are not restoration-type-dependent, which reduces sparing costs and technician confusion. Additionally, as networks and customer interface demands evolve, you can easily redeploy optical circuit packs as necessary.
Single Software Load
One software load supports all of the restoration types listed previously, eliminating unnecessary guesswork when ordering. No software right-to-use license is required for each protection type. After the software is purchased, all features with full functionality are available to the user.
A common chassis supporting all optical interface speeds allows the technician to spend time deploying bandwidth and services instead of learning about multiple equipment platforms. Many equipment vendors offer optical line-speed specific platforms (OC-3/STM-1, OC-12/STM-4, DWDM, and so on) and categorize platforms by restoration mechanisms (UPSR/SNCP, 2F-BLSR/MS-SPR, and 4F-BLSR/MS-SPR). This not only causes ordering confusion, but brings into question whether the inventoried equipment will accommodate the functionality required to support the desired application. The Cisco ONS 15454 platform's line-rate and restoration flexibility makes ordering and deploying simple, fast, and easy. With integrated DWDM capabilities, the need to deploy another metro-DWDM platform is reduced.
Multiservice Interface Selection
DS-1/E1 through OC-192/STM-64, Ethernet, Fast Ethernet, Gigabit Ethernet, and 10 Gigabit Ethernet interfaces are all supported. This eliminates the "missing interface" found with many vendors' bit-rate-specific product offerings.
The Cisco ONS 15454, the industry's leading metro optical transport platform, delivers supercharged SONET/SDH transport, integrated optical networking, unprecedented multiservice interfaces, and competitive economic benefits.
Cisco ONS 15454 4-Port 2.5-Gbps Muxponder Card Features and Specifications
• Single-width card slot design for high-density, 2.5-Gbps solutions
• Up to 12 muxponder cards per shelf assembly enables up to 192 2.5-Gbps interfaces per bay frame
Flexible Restoration Options
• Transparent APS/LMSP, UPSR/SNCP, and BLSR/MSP-SPR
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