PDF(197.5 KB) View with Adobe Reader on a variety of devices
Updated:October 30, 2008
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
The Cisco® I-Flex design combines shared port adapters (SPAs) and SPA interface processors (SIPs) using an extensible design that enables service prioritization for data, voice, and video services. Enterprise and service provider customers can use the improved slot economics resulting from modular port adapters that are interchangeable across Cisco routing platforms.
The I-Flex design maximizes connectivity options and offers superior service intelligence through programmable interface processors that deliver line-rate performance. I-Flex enhances speed-to-service revenue and provides a rich set of quality-of-service (QoS) features for premium service delivery while effectively reducing the overall cost of ownership. This data sheet contains the specifications for the Cisco 2-Port Channelized OC12/STM-4 SPA (Figure 1).
Figure 1. Cisco 2-Port Channelized OC-12/STM-4 Shared Port Adapter
The Cisco 2-Port Channelized OC-12/STM-4 SPA is available on high-end Cisco routing platforms offering the benefits of network scalability with lower initial costs and ease of upgrades. The Cisco SPA/SIP portfolio continues the Cisco focus on investment protection along with consistent feature support, broad interface availability, and the latest technology. The Cisco SPA/SIP portfolio allows different interfaces (Packet over SONET/SDH [POS], ATM, Ethernet, etc.) to be deployed on the same interface processor.
Internet traffic continues to grow at an explosive rate, with the number of users doubling each year. This unsurpassed growth is increasing the demand for higher-capacity interfaces from OC-3/STM-1 to OC-48/STM-16. In addition, POS enables efficient transport of IP traffic and uses SONET/SDH concatenated payloads (that is, STS-3c/VC-4, STS-12c/VC-4-4c, or STS-48c/VC-4-16c) to achieve a higher order of statistical multiplexing. At present, concatenated services at VC-4 rates are available only in some parts of the world (for example, Europe), with higher rates not yet readily available. The new channelized OC-12/STM-4 SPA provides customers in these areas with an STM-4 POS interface that can be provisioned through the traditional network. The Cisco 2-Port Channelized OC-12/STM-4 SPA builds on the SONET/SDH channelization capability.
• Two channelized OC-12/STM-4 ports per SPA
• SONET mappings
– STS-1<>DS3 (clear channel)
– PDH DS3 (M13 & C-bit) STS-1<>DS3<>DS1
– PDH DS3 (M13 & C-bit) STS-1<>DS3<>DS1<>nxDS0
• SDH mappings (please check platform documentation for support)
• Channelization support for 4 OC-3 or 12 DS-3 or 336 DS-1 or 2000 DS-0 or n x DS-0 channels, or any combination of these, to a total of 2000 channels
• Multilink bundling on T1/E1 channels as per RFC 1990
• Subrate DS-3
• Bit Error Rate Test (BERT) support on T1/E1 channels
all 0s, all 1s, 2^11, 2^15, 2^20, 2^20 QRSS, 2^23, alternating 0s and 1s, 1-in-8, 3-in-24, Bit error insertion, Framed all zeroes, Framed all ones
• BERT support on T3/E3 channels
T3/E3: 2^23-1 PRBS (inverted), Framed all ones, Framed all zeroes, Bit error insertion, 2^15, 2^20
Table 1 shows the hardware specifications for the channelized OC-12/STM-4 SPA.
Table 1. Hardware Specifications for the Cisco 2-Port Channelized OC-12 SPA
Cisco ASR9000 Series Router
Port density per SPA
2-port channelized OC-12/STM-4
Physical interface (channelized OC-12)
OC-12c/STM-4 Small Form-Factor Pluggable (SFP) optics module (refer to optical parameters in Table 2)
Visual status indicators (LEDs):
• SPA status LED
• Per-port LEDs
• Carrier and alarm
• Active and loopback
IETF RFC 1490, Frame Relay Encapsulation
RFC 1662, Point-to-Point Protocol (PPP) in High-Level Data Link Control (HDLC)-like framing
Table 2. Optical Specifications for the Cisco 2-Port Channelized OC-12 SPA
Up to 0.25 mi (500m)
Up to 1.2 mi (2 km)
SM intermediate reach (IR-1)
Up to 9 mi (15 km)
SM long reach (LR-1)
Up to 25 mi (40 km)
SM extended reach (LR-2)
Up to 50 mi (80 km)
Power and Environmental Requirements
When installed in Cisco routers, these SPAs do not change the power or environmental requirements and standards of the router platform itself. Refer to the platform-specific data sheets for more information.
Cisco offers a wide range of services programs to accelerate customer success. These innovative services programs are delivered through a unique combination of people, processes, tools, and partners, resulting in high levels of customer satisfaction. Cisco services help you protect your network investment, optimize network operations, and prepare your network for new applications to extend network intelligence and the power of your business. For more information about Cisco services, refer to
Cisco Technical Support Services or
Cisco Advanced Services.
For More Information
For more information about the Cisco SPA/SIP portfolio, visit
www.cisco.com/go/spa or contact your local Cisco account representative.