Cisco HWIC-4A/S= 4 Port Networking Expansion Module
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HWIC-4A/S= Cisco 4 Ports Serial HWIC Expansion Module New

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Part Number#: HWIC-4A/S=
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Short Description:
HWIC-4A/S= Cisco 4 Ports Async/Sync Serial Adapter High Speed Wan Interface Card (HWIC) Expansion Module | Made by Cisco | New Factory Sealed
Product Condition:
New Retail Factory Sealed
Warranty provided by ALLHDD.COM:
90 Days
Troubleshooting and Maintenance

The HWIC-4A/S is a Cisco 4 Ports Async/Sync Serial HWIC Expansion Module that provides four high-speed serial interfaces for connectivity with asynchronous and synchronous networks. Troubleshooting and maintenance of this module can be done using the following steps:

  • Verify the Configuration: Check the configuration of the HWIC-4A/S module to ensure it is set up correctly. This can be done using the "show running-config" command. If the configuration is incorrect, make the necessary changes and save the configuration.
  • Check the Cable Connections: Ensure that the cables connected to the HWIC-4A/S module are properly seated and connected to the correct ports. Loose or improperly connected cables can cause connectivity issues.
  • Check for Errors: Use the "show interfaces" command to check for any errors or drops on the interfaces. If any errors or drops are found, investigate and resolve the issue.
  • Check for Compatibility: Verify that the HWIC-4A/S module is compatible with the router or switch it is installed in. Incompatible hardware can cause the module to not function properly.
  • Check for Firmware Updates: Check for any available firmware updates for the HWIC-4A/S module. Updating the firmware can address any bugs or issues with the module's operation.
  • Reset the Module: If all else fails, try resetting the HWIC-4A/S module to its default settings. This can be done using the "hw-module slot x reset" command, where "x" is the slot number of the module.

Regular maintenance of the HWIC-4A/S module can also help prevent issues. This can include cleaning the module and its connectors, as well as checking for any physical damage or wear and tear. Additionally, keeping the firmware up to date and ensuring the module is properly cooled can help prolong its lifespan and prevent issues from occurring.

Compatibility and Integration

The HWIC-4A/S is a Cisco expansion module that provides four asynchronous/synchronous serial ports for connecting devices such as modems, routers, and other networking equipment. The module is designed to be used with compatible Cisco routers and switches that have a High-Speed WAN Interface Card (HWIC) slot.

To ensure compatibility and integration, the following steps need to be taken:

  • Ensure the Cisco router or switch has an available HWIC slot: The HWIC-4A/S module is designed to fit into a specific type of slot on Cisco routers and switches. Before purchasing the module, verify that the router or switch has an available HWIC slot and that it is compatible with the HWIC-4A/S module.
  • Install the HWIC-4A/S module: Once the router or switch is verified to have an available HWIC slot, the module can be installed. This involves removing the cover plate over the HWIC slot, carefully inserting the module into the slot, and securing it in place with screws.
  • Configure the module: After the HWIC-4A/S module is installed, it needs to be configured to work with the router or switch. This involves configuring the serial ports on the module with the appropriate settings such as speed, parity, and flow control.
  • Test the module: Once the module is configured, it is important to test it to ensure that it is working correctly. This can involve connecting devices to the serial ports and verifying that they are able to communicate with each other.
Advantages and Benefits

The HWIC-4A/S is a Cisco expansion module that provides four asynchronous/synchronous serial ports for routers and switches. Here are some advantages and benefits of using the HWIC-4A/S module:

  • Increased connectivity: With the HWIC-4A/S module, you can connect up to four serial devices to your router or switch, providing increased connectivity options for your network.
  • Flexibility: The module supports both asynchronous and synchronous serial interfaces, which allows you to connect a wide range of devices such as modems, routers, and switches. This makes the HWIC-4A/S a flexible expansion option for your network.
  • Efficient use of space: The HWIC-4A/S module is designed to fit into a single High-Speed WAN Interface Card (HWIC) slot on a Cisco router or switch, which means you can expand your network without sacrificing additional space.
  • High-performance: The HWIC-4A/S module supports data rates of up to 8 Mbps per port, making it suitable for high-performance applications such as video streaming, data transfer, and VoIP.
  • Cost-effective: The HWIC-4A/S module is a cost-effective solution for expanding your network's connectivity options. Instead of purchasing a new router or switch with more built-in serial ports, you can simply add the HWIC-4A/S module to your existing device.
General Information
  • Manufacturer: Cisco Systems, Inc
  • MPN: HWIC-4A/S=
  • Product Name: 4-Port Async/Sync Serial HWIC
  • Product Type: HWIC
  • SKU: HWIC-4A/S=
Technical Information
  • Application/Usage: Wide Area Network
Interfaces / Ports
  • Interfaces/Ports: 4 x Synchronous /Asynchronous Serial WAN
  • Interfaces/Ports Details: 4 x Asynchronous/Synchronous Serial WAN

Media & Performance

  • Connectivity Media: Serial Cable
  • Data Transfer Rate: 230.40 Kbps Maximum Asynchronous Serial Per Port
  • Data Transfer Rate: 256 Kbps Maximum Synchronous Serial Per Port

Management & Protocols

  • Protocols SLIP
  • Protocols PPP
  • Protocols HDLC
  • Protocols X.25
  • Protocols SDLC
  • Protocols TCP/IP

Controls / Indicators

  • Status Indicators: CONN LED

Environmental Conditions

  • Temperature -4°F (-20°C) to 149°F (65°C) Storage
  • Temperature 32°F (0°C) to 104°F (40°C) Operating
  • Humidity 10% to 90% Non-condensing Relative Humidity


  • Height: 0.8 Inch
  • Width: 5.6 Inch
  • Depth: 5.6 Inch


  • Additional Information
  • The HWIC-4A/S provides four serial async/sync ports using Smart Serial connectors and cabling
  • DCN (Data Communications Network)
  • Serial & Legacy Concentration
  • Bisync Support
  • Network Clock Synchronization
  • Interfaces supported:
  • In both DTE and DCE formats: V35, X.21, RS-232, and RS-449
  • In DTE format only: EIA-530 and EIA-530A
Product Condition:
New Retail Factory Sealed
Warranty provided by ALLHDD.COM:
90 Days

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