2.5-GBPS MULTIRATE TRANSPONDER CARD FOR THE CISCO ONS 15454 MULTISERVICE TRANSPORT PLATFORM
The Cisco® ONS 15454 Multiservice Transport Platform (MSTP) support for a 2.5-Gbps multirate transponder card simplifies the integration and transport of many service types, including Enterprise Systems Connection (ESCON), Fibre Channel, Gigabit Ethernet, SONET/SDH (to 2.5 Gbps), and video interfaces and services into enterprise as well as metropolitan (metro) and regional service provider networks.
Metro transport networks must support a wide variety of service demands, from low-rate DS-1/E-1, DS-3/E-3, 10/100BASE-T, OC-3/STM-1, etc., to higher-rate OC-12/STM-4, Gigabit Ethernet, OC-48/STM-16, 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, where 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 platform types, including metro DWDM and SONET ADMs, to support the wide variety of services is not cost effective for many service provider and enterprise networks. Thus, a more cost-effective networking solution is required to enable the delivery of all services, from lower-speed DS-1/E-1s to higher-speed 10 Gigabit Ethernet and OC-192/STM-64s.
The 2.5-Gbps multirate transponder (2.5G transponder) card (Figure 1) provides the capability to transport a wide variety of service types from 155 Mbps to 2.48 Gbps, including services such as ESCON, SONET OC-3 through OC-48, SDH STM-1 through STM-16, Gigabit Ethernet, 1- or 2-Gbps Fibre Channel, and other services, over a 100-GHz, ITU-compliant wavelength, with 50-GHz wavelength stability for future 64-channel operation. The 2.5G transponder card architecture contains a single client interface that is mapped to a single-line DWDM interface, without accessing the Cisco ONS 15454 shelf cross-connect fabric.
The interface to the client is via a variety of Small Form-Factor Pluggable (SFP) optics modules, enabling a wide service mix, including ESCON, OC-3/STM-1, OC-12/STM-4, OC-48/STM-16, Gigabit Ethernet, 1-Gbps Fibre Channel/FICON, 2-Gbps Fibre Channel/FICON, as well as high-definition television (HDTV), D1/SDI video, DV6000, and different fiber types (single- and multimode), wavelengths (850 and 1310 nm), and fiber reach (short reach/intra-office, intermediate reach/short haul, etc.). The SFP optics modules are equipped with LC connectors to enable high-density placement on the card.
The DWDM line interface provides one long-reach/long-haul (LR/LH), ITU-compliant, 100-GHz spaced optical interface, with a 50-GHz wavelength stability, using LC connectors; it operates at line rates of up to OC-48 plus G.709 overhead. The DWDM output line interface is tunable across four adjacent 100GHz wavelengths, enabling support for 32-channel DWDM networks using eight discrete card types. Each 2.5G transponder card wavelength is offered in protected or unprotected versions, with the protected version including a second DWDM line output/input, enabling optical line protection over a DWDM network. Taking advantage of amplification and dispersion compensation, the 2.5G transponder card is capable of optical reaches exceeding 500 km. When operated within the outlined specifications with forward error correction enabled, the card delivers the client payload with a bite error rate (BER) up to 10E-15 (refer to Table 1).
The 2.5G transponder card incorporates both client and DWDM line interfaces on the same card. The 2.5G transponder 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 only common card type required for operation is the timing, communications, and control card in MSTP system deployments. The addition of a cross-connect card to the Cisco ONS 15454 system, beginning with Release 4.6 software, enables support of hybrid applications, further enabling a mixture of transparent 200-Mbps to 2.5-Gbps services as well as aggregated services via the cross-connect card to other transport cards.
The 2.5G transponder card supports many carrier-class features and advanced capabilities necessary to deliver the wide service mix, including provisionable protocol transparency, wavelength tunability, flexible protection mechanisms, flow-through timing, management, and performance-monitoring capabilities outlined in the following sections.
Provisionable Protocol Transparency
The 2.5G transponder card is designed to support both transparent wavelength and nontransparent services on the Cisco ONS 15454 platform via three operating modes, 2R, 3R, and 3R+. In 2R mode, the 2.5G card passes data transparently between the client interface and the DWDM line interfaces, and conversely. The data may vary at bit rates for 155 Mbps to 2.5 Gbps, and includes ESCON and video signals (HDTV, D1, and C-Cor DV6000). The 2R mode regenerates and reamplifies the inbound signal, but does not provide retiming.
The 2.5G transponder card in 3R mode provides inbound signal regeneration, reamplification, and retiming. The data bit rates supported are from 155 Mbps to 2.488 Gbps and include SONET/SDH OC-3/STM-1, OC-12/STM-4, and OC-48/STM-16 signals, 1- and 2-Gbps Fibre Channel and FICON, and Gigabit Ethernet.
The 2.5 transponder card in 3R enhanced mode maps the client signal over G.709 with integrated forward error correction (FEC) for transparent service support for the 3R signals outlined earlier. The G.709 technology provides an envelope the payload and provides a SONET/SDH-like layering structure that provides in-service performance monitoring, protection, and optical management functions. This 3R+ mode improves network performance and ultimately the reach of the system.
For SONET- or SDH-based client payloads, there are three operating modes, transparent (monitor only), line termination, and section termination. When provisioned in transparent operating mode, the card passes all the SONET/SDH overhead bytes transparently. The card monitors key SONET/SDH overhead bytes, such as B1 (section BIP-8) and J0 (section trace), to allow fault-isolation as well as performance-monitoring capabilities. Additionally, in transparent mode, in order to ensure network integrity, a client interface loss of signal or loss of frame on one end of the network is transferred to the associated far-end client interface, shutting off the far-end laser. In line termination mode, the client transport overhead (TOH) is terminated and the B1/B2 bytes are regenerated with appropriate remote indication signals inserted.
The 2.5G transponder cards operate on the 100-GHz ITU grid and are tunable across four adjacent 100-GHz channels per card, with 50-GHz wavelength stability, allowing eight discrete cards to cover the entire 32-wavelength plan. The incorporation of tunability into the 2.5G transponder cards greatly reduces the customer's inventory to cover all the wavelengths for sparing needs.
Flexible Protection Mechanisms
The 2.5G transponder card provides flexible protection capabilities for both client and DWDM line interfaces, outlined in Table 1, enabling support for a wide variety of network configurations required to deliver the various service-level agreements (SLAs) required by the customer application.
Table 1. Protection Formats
Unprotected client and DWDM line interfaces
These interfaces provide no client terminal interface or transponder card protection. The client signal is transported over a single, unprotected transponder card. This configuration would be suitable for transporting client payloads over the DWDM network that are being protected via unidirectional-path switched ring/Subnetwork Connection Protection (UPSR/SNCP) or Bidirectional Line Switch Ring/multiplex switching protection-shared protection ring(BLSR/MSP-SPR) protocols.
1+1 protected client interfaces
These interfaces provide protection for both the client terminal interfaces as well as the transponder cards. Two client interfaces operating 1+1 automatic protection switching (APS) are passed through two transponder cards, with switching handled between client terminal equipment interfaces.
Y-cable client interface
This interface provides transponder equipment and DWDM transport protection without client terminal equipment interface protection. A single client interface is split to two transponder cards. This feature is not supported on the protected version of the transponder card.
Protected DWDM line interface
This interface provides network protection for a single client signal using the protected version of the 2.5G transponder card. This card splits the outbound signal into two wavelength paths. At the receiver end, the card selects the better of two input signals, forwarding it to the client transmitter.
Protected DWDM Line Configuration
The transponder card allows timing to "flow through" from client to DWDM line optical interfaces. Recovered receiver timing from one interface (client or line) is used to time the other transmitter interface (line or client). This enables the transported signal to remain independent from the node timing.
The Cisco ONS 15454 provides comprehensive management capabilities to support the operations, administration, monitoring, and provisioning (OAM&P) capabilities through the integrated Cisco Transport Controller craft interface with support from the Cisco Transport Manager element management system (EMS). The 2.5G transponder card incorporates provisionable G.709 functions for all 3R service interfaces. G.709 functionality enables a carrier transporting a service transparently to identify network impairments that may degrade the transported signal and exceed SLA requirements. The general communication channel (GCC) of the G.709 provides a separate communications channel on a per-wavelength basis for the transparently transported service channels, as compared with the section data communication channel/regenerator section data communications channel (SDCC/RSDCC) in SONET/SDH signals. This GCC enables the Cisco ONS 15454 to extend its advanced network autodiscovery capabilities to DWDM-based services. For SONET/SDH services, when termination mode is used, SDCC can be used to enable similar function on the Cisco ONS 15454 SONET/SDH network element, allowing the capabilities to manage both SONET/SDH and DWDM networks at the same time. The integrated Cisco ONS 15454 Cisco Transport Controller craft manager as well as the complementary Cisco Transport Manager EMS provide the user access for OAM&P for the system.
The performance-monitoring capabilities of the 2.5G transponder card depend on the service being transported. For 2R services, performance monitoring is limited to that provided by the SFP, which includes received and transmit powers, laser bias current, inventory, and the DWDM optical interface, including received and transmit powers and laser bias current. For 3R services, performance monitoring is available based on the signal type, except for 2-Gbps Fibre Channel, which again is limited to the performance-monitoring statistics delivered by the SFP optics module. For SONET/SDH signals, extensive performance-monitoring and 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. For data applications, such as Gigabit Ethernet and 1-Gbps Fibre Channel, 8b/10b performance monitoring is supported. Finally, the digital wrapper channel is monitored per ITU-T requirements (G.709 and G.798). Optical performance parameters on the DWDM line interface are supported, including laser bias current and receiver optical power. Calculation and accumulation of the performance-monitoring data are in 15-minute and 24-hour intervals.
The 2.5 transponder cards incorporate faceplate-mounted LEDs to provide a quick visual check as to the operational status at the card. Printed on the faceplate is an icon, an orange circle, indicating that the shelf slots on the card can be physically installed.
The 2.5G transponder card adds numerous new applications to an already flexible Cisco ONS 15454 platform. One identified application includes storage area networking (SAN) transport (Figure 6), providing connectivity between the primary and backup data centers for disaster avoidance.
SAN Connectivity for Disaster Avoidance
Another application, detailed in Figure 7, is the transparent transport of SONET/SDH-based services, OC-48/STM-16 in this example, for a carrier's carrier service application.
OC-192/STM-64 Transport for Carrier's Carrier Services
In each of these network applications, the user can provide a mixture of service types over the same Cisco ONS 15454 platform, taking advantage of the other supported interface types, including DS-n/E-n private line, D1/SDI and C-Cor DV6000 video, Ethernet, ESCON, and SONET/SDH OC-n/STM-m.
THE CISCO ADVANTAGE
The Cisco ONS 15454 2.5G Transponder Card complements and extends the services capabilities of the Cisco ONS 15454 platform. The 2.5G transponder card enables users to deliver wavelength services over their existing fiber plant over a proven Cisco ONS 15454 platform that also supports service aggregation, including DS-1/E-1, DS-3/E-3, OC-n/STM-n, and Ethernet. The Cisco ONS 15454 platform enables users to reduce the need to deploy standalone metro DWDM and multiservice provisioning platforms (MSPPs) to transport a mixture of services, as outlined in Figures 8 and 9.
Today's DWDM Architectures
Cisco ONS 15454 Hybrid DWDM Architecture
The Cisco ONS 15454 Optical Transport solution offers significant advantages over traditional network elements that offer broad deployment and capabilities, including:
• Unprecedented service interface selection-The Cisco ONS 15454 platform supports the broadest range of service interfaces available on a single chassis type by using software personality loads, including asynchronous (DS-1/E-1, DS-3/E-3), SONET/SDH (EC-1, OC-3/STM-1 to OC-192/STM-64), Ethernet (10, 100, 1000, and 10,000 Mbps), SAN (ESCON, FICON, 1- and 2-Gbps Fibre Channel), and video (D1 and C-Cor DV6000) interfaces.
• Multiple restoration types-The Cisco ONS 15454 MSPP platform supports two- or four-fiber BLSR/MS-SPR, UPSR/SNCP, linear APS/SNC, 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 inter-office network, normally deployed using two- or four-fiber BLSR/MS-SPR restoration, as well as the collector or fiber to the building networks, normally taking advantage of UPSR/SNCP restoration.
• Common line cards and chassis-Optical line cards are not restoration-type dependent, reducing sparing costs and technician confusion. Additionally, as networks change and customer interface demands evolve, the user has the ability to easily and simply redeploy optical circuit packs as necessary.
• Common chassis type-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, and so on) and categorize platforms by restoration mechanisms (UPSR/SNCP, 2F-BLSR/MS-SPR, 4F-BLSR/MS-SPR, etc.). This not only causes confusion when ordering, but also may bring into question whether the required platform will be available to support the desired application. The line rate and restoration flexibility of the Cisco ONS 15454 makes ordering and deploying simple, fast, and easy.
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 2.5-GBPS MULTIRATE TRANSPONDER CARD FEATURES AND SPECIFICATIONS
• High-density solution with single chassis slot design supporting bidirectional client to DWDM operation
• Up to 12 bidirectional 2.5G transponder cards per shelf assembly, 48 cards per bay
Flexible Protection Options
• Transparent support for UPSR/SNCP, BLSR/MSP, and 1+1 APS/SNC
· TR-NWT-000332, Issue 4, Method 1 calculation for 20-year mean time between failure (MTBF)
1. All compliance testing and documentation may not be completed at release of the product. Check with your sales representative for countries outside of Canada, the United States, and the European Union.
2. For other countries with SDH/ETSI requirements, confirm compliance with a Cisco account representative.
Table 3. System Requirements
Cisco ONS 15454 SONET/ANSI
Cisco ONS 15454 SDH/ETSI
TCC2 and TCC2P
TCC2 and TCC2P
All (not required)
All (not required)
15454-SA-ANSI or 15454-SA-HD shelf assembly with FTA3 version fan-tray assembly
15454-SA-ETSI shelf assembly with SDH 48V fan-tray assembly
1310 nm, single-mode fiber (SMF), 15 km IR-1/S-1.1
1310 nm, SMF, 15 km IR-1/S-4.1
1310 nm, SMF, 15 km IR-1/S-16.1
1310 nm, SMF, 2 km SR-1/I-16.1
850 nm, multimode fiber (MMF), 0.5 km, 1000BASE-SX
1310 nm, SMF, 10 km, 1000BASE-LX
850 nm, MMF, 0.3 km
1310 nm, SMF, 10 km
1310 nm, MMF, 2 km
1310 nm, SMF
1310 nm, SMF
1310 nm, SMF
Automatic laser shutdown (ALS) and restart
ITU-T G.664 (06/99)
Connector type (Tx/Rx)
DWDM Line Interface
Output bit rate
155 Mbps to 2.66 Gbps
ALS and restart
ITU-T G.664 (06/99)
Wavelength, nominal, (lTnom)
Four-channel tunable (Table 5)
Spectral range (lTmin to lTmax)
1530 to 1565 nm
Spectral width @ 20 dB (Dl20)
Connector type (Tx/Rx)
Output power (PTmin to PTmax)
-1 to +1 dBm
-4.5 to -2.5 dBm
Required optical return loss, minimum
Extinction ratio, minimum (reminx)
Laser safety class
Sensitivity, 3R mode (PRmin to PRmax)
FEC off; BER = 10E-12; OSNR >14 dB
FEC on; BER = 10E-15; OSNR >14 dB
FEC off; BER = 10E-12; OSNR >11 dB
FEC on; BER = 10E-15; OSNR >7 dB
Sensitivity, 2R mode (PRmin to PRmax)
BER = 10E-12; OSNR >15 dB
Note: Optical signal to noise ration (OSNR) defined at 0.5-nm bandwidth
-28 to -9 dBm
-31 to -9 dBm
-23 to -9 dBm
-23 to -9 dBm
-24 to -9 dBm
3R mode-Dispersion power penalty (FEC on or off)
3R mode-Dispersion OSNR penalty (FEC on or off)
2R mode-Dispersion power penalty3
2 dB @ +/-5400 ps
2 dB @ +/-5400 ps
3 dB @ +/-3300 ps
Chromatic dispersion tolerance (DLRmax)
Up to +/-5400 ps/nm (360 km in 3R mode)
Receiver reflectance (maximum)
Input wavelength bandwidth (lc_rx)
Third window, ITU G.692,
Signal fail (SF)
Client port LEDS (bicolor)
DWDM port LEDs (tricolor)
Active/standby (protection card only)/alarm
-5 to 55°C
23 to 131°F
5 to 95% noncondensing
-40 to 185°F
40 to 85°C
5 to 95% noncondensing
3. Reach in 2R mode is OSRN limited as compared with dispersion limited.
Table 5. Supported Wavelengths on 2.5-Gbps Multirate Transponder Cards4
4. Lead times on wavelength-based optical modules vary substantially. For assistance with wavelength selection, refer to Cisco price list or lead-time tool, available on Cisco ordering page at the following URL:http://www.cisco.com/en/US/ordering/index.shtml
Table 6. Ordering Information5
100-Mbps to 2.5-Gbps multirate transponder card, unprotected DWDM line, SFP client module slot, 100-GHz ITU DWDM wavelength, LC connectors
100-Mbps to 2.5-Gbps multirate transponder card, protected DWDM line, SFP client module slot, 100-GHz ITU DWDM wavelength, LC connectors
SFP Optics Modules
OC-3/STM-1/D1-SDI SFP, intermediate reach, 1310 nm, single mode, LC connector
OC-12/STM-4 SFP, intermediate reach, 1310 nm, single mode, LC connector
OC-48/STM-16 SFP, intermediate reach, 1550 nm, single mode, LC connector