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by Cisco
Product Line: Cisco Series
Product Type: Shared Port Adapter
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Title: Surplus

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Product Description

The SPA-4XT-SERIAL interface card features four synchronous serial ports with Smart Serial connectors, designed for Cisco 7600 Series Routers, Cisco XR 12000 Series Routers, and Cisco ASR 1000 Series Routers. It supports HDLC, PPP, Frame Relay, and MLPPP encapsulations, with a maximum synchronous speed of 8 Mbps, and is equipped with LED indicators for SPA status, CD detect, and local loopback. The card operates within a temperature range of 5 °C to 40 °C, consuming 11 W of power, and is intended for transporting synchronous legacy protocols over IP networks in enterprise and service provider environments.


  • What is the maximum synchronous speed of the networking hardware?
    The maximum synchronous speed is 8 Mbps.
  • How many ports does the device feature?
    The device has 4 ports.
  • Can this hardware be used with Cisco 7600 Series Routers?
    Yes, it is compatible with Cisco 7600 Series Routers, among others.
  • What type of connectors does the hardware use?
    It uses Smart Serial connectors.
  • Are LED indicators available on this device?
    Yes, it includes SPA Status, CD Detect, and Local Loopback LED indicators.
  • What encapsulations does the device support?
    It supports HDLC, PPP, Frame Relay, and MLPPP encapsulations.
  • What are the dimensions of the hardware?
    The dimensions are 0.8 in. in height, 6.75 in. in width, and 7.28 in. in depth.
  • What is the power consumption of the device?
    The device consumes 11 W of power.
  • What is the operating temperature range?
    The operating temperature ranges from 5 °C to 40 °C.
  • Does the device support asynchronous protocols?
    No, the device does not support asynchronous protocols.

Product Review

The Cisco SPA-4XT-SERIAL adapter offers four synchronous serial ports, enhancing connectivity for enterprise and service provider networks, particularly in the transportation of legacy protocols over IP networks. However, its lack of support for asynchronous protocols and a maximum synchronous speed of 8 Mbps may limit its application in environments requiring higher bandwidth or asynchronous data transmission. Designed for compatibility with Cisco 7600, XR 12000, and ASR 1000 series routers, it provides a versatile solution for integrating smart serial connections, though its operational temperature range and power consumption should be considered in deployment planning.


The Cisco SPA-4XT-SERIAL is a specialized networking hardware module designed for integration with Cisco 7600 Series Routers, Cisco XR 12000 Series Routers, and Cisco ASR 1000 Series Routers. This module offers four synchronous serial ports, facilitating efficient WAN connectivity, particularly for enterprise and service provider networks. It plays a crucial role in the transportation of synchronous legacy protocols, including X.25, over an IP network, ensuring seamless communication and data transfer. Equipped with Smart Serial connectors, the SPA-4XT-SERIAL ensures a reliable connection and compatibility with a variety of networking setups. The module supports multiple encapsulation formats like HDLC, PPP, Frame Relay, and MLPPP, providing flexibility in configuring network protocols according to specific requirements. Additionally, its maximum synchronous speed of 8 Mbps allows for high-speed data transmission, suitable for a range of network applications. The SPA-4XT-SERIAL is designed with efficiency and durability in mind. It measures 0.8 inches in height, 6.75 inches in width, and 7.28 inches in depth, with a power consumption of 11 W, making it a compact and energy-efficient option for networking hardware. The module operates effectively within a temperature range of 5 °C to 40 °C, and can withstand storage temperatures from -40 °C to 70 °C, ensuring reliability under various environmental conditions. Furthermore, its operational and storage relative humidity ranges from 5% to 85% and 5% to 95%, respectively, highlighting its adaptability in different humidity conditions. The SPA-4XT-SERIAL module features LED indicators for SPA Status, CD Detect, and Local Loopback, providing immediate visual feedback on the operational status and facilitating troubleshooting. Despite its support for synchronous serial port types, it does not support asynchronous protocols, focusing instead on high-performance, synchronous connectivity. Port configuration is versatile, including EIA-232, EIA-449, EIA-530, EIA-530A, V.35, and X.21 specifications, which enhances the module's compatibility with a wide range of devices and network configurations. The design of the SPA-4XT-SERIAL follows the I-Flex standard, ensuring it meets the high expectations for Cisco networking hardware in terms of both functionality and reliability. In summary, the Cisco SPA-4XT-SERIAL is a critical component for networks requiring high-speed, synchronous data transmission capabilities, especially in environments that rely on legacy protocols. Its compatibility with major Cisco routers, support for multiple encapsulations, and high-speed performance make it an essential tool for enterprises and service providers aiming to maintain efficient, reliable network operations. Key Features: -
  • Four synchronous serial ports for high-speed data transmission
  • Support for multiple encapsulation formats, including HDLC, PPP, Frame Relay, and MLPPP
  • Designed for use with Cisco 7600 Series, Cisco XR 12000 Series, and Cisco ASR 1000 Series Routers


Item NumberCisco SPA-4XT-SERIAL
Port Count4
Compatible DevicesCisco 7600 Series Routers, Cisco XR 12000 Series Routers, Cisco ASR 1000 Series Routers
Connection InterfaceSmart Serial
Indicator LightsSPA Activity, Carrier Detect, Local Loopback Mode
Supported Encapsulation MethodsHDLC, PPP, Frame Relay, MLPPP
Peak Synchronous Rate8 Mbps
Unit Height0.8 inches
Unit Width6.75 inches
Unit Depth7.28 inches
Energy Consumption11 Watts
Operational Temp Range (Low)5 °C
Operational Temp Range (High)40 °C
Storage Temp Range (Low)-40 °C
Storage Temp Range (High)70 °C
Operational Humidity Range (Low)5%
Operational Humidity Range (High)85%
Storage Humidity Range (Low)5%
Storage Humidity Range (High)95%
Asynchronous Protocol SupportNo
Interface SpecificationsEIA-232, EIA-449, EIA-530, EIA-530A, V.35, X.21
Interface CategorySynchronous Serial
Network Connection CapabilityYes
Intended Use EnvironmentEnterprise and service provider networks
Primary Use CaseTransport of synchronous legacy protocols (e.g., X.25) over IP networks

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