Cisco Shared Port Adapters SPA Interface Processors

Cisco 2- and 4-Port OC-3c/STM-1c POS Shared Port Adapters

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The Cisco® I-Flex approach combines shared port adapters (SPAs) and SPA interface processors (SIPs), providing an extensible design that enables service prioritization for data, voice, and video services. Enterprise and service provider customers can take advantage of 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 and 4-Port OC-3c/STM-1c POS SPAs (Cisco 2- and 4-Port OC-3 POS SPAs; refer to Figure 1).

Figure 1. Cisco 2- and 4-Port OC-3 POS SPAs

Product Overview

The Cisco 2- and 4-Port OC-3 POS SPAs are available on high-end Cisco routing platforms, offering the benefits of network scalability with lower initial costs and easy upgrades. The Cisco SPA/SIP portfolio continues Cisco's focus on investment protection along with consistent feature support, broad interface availability, and the latest technology. The Cisco SPA/SIP portfolio allows deployment of different interfaces (packet over SONET/SDH [POS], ATM, Ethernet, etc.) on the same interface processor.
The Cisco 2- and 4-Port OC-3 POS SPAs are available with two or four Small Form-Factor Pluggable (SFP) interfaces. SFP modules are available in multiple optical reaches from 2 to 80 kilometers (km).

Key Features and Benefits

The Cisco SPA/SIP portfolio offers many advantages, including:

• Highly modular, flexible, intelligent interface processors

– Superior flexibility, providing a combination of interface types on the same interface processor for consistent services, independent of access technology.

– Pioneering programmable interface processors that provide flexibility for the service diversity required in next-generation networks.

– Innovative design that supports intelligent service delivery without compromising on performance.

• Increased speed to service revenue

– The scalable, programmable Cisco architecture extended to 10 Gbps dramatically improves customer density, increasing potential revenue per platform.

– Interface breadth (copper, channelized, POS, ATM, and Ethernet) on a modular interface processor allows service providers to roll out new services more quickly, helping ensure that all customers large and small receive consistent, secure, and guaranteed services.

– High-density SFP interfaces are featured for high-port-count applications with reach flexibility. Future optical technology improvements can be adopted using existing SPAs.

• Dramatically improved return on your routing investment

– Improved slot economics and increased density reduce capital expenditures (CapEx).

– The ability to easily add new interfaces as they are needed enables a "pay-as-you-grow" business model.

– SPAs are shared across multiple platforms, and can be easily moved from one to another, providing consistent feature support, accelerated product delivery, and a significant reduction in operating expenses (OpEx) through common sparing as service needs change.

Product Specifications

Table 1 gives specifications of the Cisco 2- and 4-Port OC-3 POS SPAs.

Table 1. Product Specifications



Product Compatibility

Cisco 7304 Router

Cisco Catalyst 6500 Series Switches

Cisco 7600 Series Routers

Cisco ASR 1000 Series Router

Cisco CRS-1 and CRS-3 (4-port OC-3 POS SPA)

Port Density per SPA

2 ports

4 ports

Physical Interface

OC-3c/STM-1c 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


High-Level Data Link Control (HDLC), RFC 2615

Point-to-Point Protocol (PPP), RFC 1662

Frame Relay, RFC 2427


Features and Functions


• Local (internal) or loop timed (recovered from network)
• Pointer activity monitoring

Local (diagnostic) and line (network) loopback

Section data communications channel (SDCC) - platform-dependent feature

Payload mapping

• POS with 1 + x^43 self -synchronous scrambler

SONET/SDH compliance

• Telcordia (Bellcore) GR-253-CORE (as applicable)
• ANSI T1.105 and T1.231
• ITU-T G.707, G.957, and G.825 (as applicable)

Supported SONET/SDH alarm and signal events:

• Signal failure bit error rate (SF-ber)
• Signal degrade bit error rate (SD-ber)
• Signal label payload construction (C2)
• Path trace byte (J1)


• Loss of signal (LOS)
• Loss of frame (LOF)
• Error counts for B1
• Threshold crossing alarms (TCA) for B1


• Line alarm indication signal (LAIS)
• Line remote defect indication (LRDI)
• Line remote error indication (LREI)
• Error counts for B2
• TCA for B2


• Path alarm indication signal (PAIS)
• Path remote defect indication (PRDI)
• Path remote error indication (PREI)
• Error counts for B3
• TCA for B3
• Loss of pointer (LOP)
• Positive stuffing event (PSE)
• Negative stuffing event (NSE)
• Path unequipped indication signal (PUNEQ)
• Path payload mismatch indication signal (PPLM)

Network Management


Simple Network Management Protocol (SNMP)

Reliability and Availability

Online insertion and removal (OIR)

Field-replaceable SFP optical modules

1 + 1 SONET automatic-protection-switching (APS) and SDH linear multiplex-section-protection (MSP) protocols

Single SPA software reset

Physical Specifications

Weight: 0.75 lb (0.34 kg)

Height: 0.8 in. (2.03 cm) (single height)

Width: 6.75 in. (17.15 cm)

Depth: 7.28 in. (18.49 cm)


2-port OC-3c/STM-1c = 13W maximum (no optics)

4-port OC-3c/STM-1c = 14W maximum (no optics)

Environmental Specifications

Operating temperature: 41 to 104°F (5 to 40°C)

Storage temperature: -38 to 150°F (-40 to 70°C)

Operating humidity: 5 to 85% relative humidity

Storage humidity: 5 to 95% relative humidity

Compliance and Agency Approvals


• UL 60950
• CSA 22.2-No.60950
• EN60950
• IEC 60950 CB Scheme
• ACA TS001
• AS/NZS 3260
• EN60825\IEC60825 laser safety (SR, IR-Class 1) (VSR-Class 1M)
• 21CFR1040 - FDA Code of Federal Regulations (USA) laser safety (SR, IR-Class 1) (VSR-Class 1M)1


• FCC Part 15 (CFR 47)
• ICES 003
• EN55022
• CISPR 22
• AS/NZ 3548
• EN55024
• EN50082-1
• EN61000-6-1
• EN61000-3-2
• EN61000-3-3

Network Equipment Building System (NEBS)
This product is designed to meet the following requirements (official qualification may be in progress):

• SR-3580 - NEBS: Criteria levels (Level 3 compliant)
• GR-63-Core - NEBS: Physical protection
• GR-1089-Core - NEBS: EMC and safety


• EN300 386/EN300 386-2 Class B
• ETS 300 019 Storage Class 1.1
• ETS 300 019 Transportation Class 2.3
• ETS 300 019 Stationary Use Class 3.1

Table 2 gives optical specifications of the Cisco 2- and 4-Port OC-3 POS SPAs.

Table 2. OC-3c/STM-1c POS Optical Specifications

SFP Optics

Maximum Distance

Multimode (MM) Short Reach (SR)

Up to 1.2 mi (2 km)

Single-Mode (SM) SR

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 Long Reach (LR-2)

Up to 50 mi (80 km)

Ordering Information

To place an order, visit the Cisco Ordering Home Page or refer to Table 3.

Table 3. Ordering Information

Product Name

Part Number

Cisco 2-Port OC-3c/STM-1c POS Shared Port Adapter


Cisco 4-Port OC-3c/STM-1c POS Shared Port Adapter






OC-3/STM-1 SFP, SM, IR-1


OC-3/STM-1 SFP, SM, LR-1


OC-3/STM-1 SFP, SM, LR-2


Service and Support

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 or contact your local Cisco account representative.