Cisco HWIC-4A/S= 4 Port Networking Expansion Module
If you need a large quantity of HWIC-4A/S= product - call us at +1 (718) 766 5269 or request a quote at live chat and our sales manager will contact you shortly.
Looking for assistance? Connect with one of our experts
We are accepting NET 30 days purchase orders & offer payment terms of up to 12 months. Get a decision in seconds, without affecting your credit.

HWIC-4A/S= Cisco 4 Ports Async/Sync Serial HWIC Expansion Refurbished

Availability: In Stock
Part Number#: HWIC-4A/S=
List Price was: $276.92
Your Price:
You Save: $204.92 (74% off)

3% Discount on Checkout

Short Description:
HWIC-4A/S= Cisco 4 Ports Async/Sync Serial Adapter High Speed Wan Interface Card (HWIC) Expansion Module | Made by Cisco | Refurbished

Interface Types of This Product: Expansion Module 4 Port

Product Condition:
Warranty provided by ALLHDD.COM:
90 Days
We are providing specifications below to explain why you should consider purchasing the Cisco 4 Port Expansion Module Networking, including a general overview, performance specifications, relevant images, media files, and technical information about the HWIC-4A/S= compatibility.

Installation and Configuration

The HWIC-4A/S is a Cisco expansion module that provides 4 asynchronous/synchronous serial ports for use in Cisco routers. Here is a step-by-step guide on how to install and configure the module:


  • Power off the router and unplug it from the power source.
  • Insert the HWIC-4A/S module into the HWIC slot on the router.
  • Make sure the module is properly seated in the slot and the retaining clips are engaged.
  • Power on the router and wait for it to boot up.


  • Connect to the router console using a terminal emulator program such as PuTTY or HyperTerminal.
  • Enter the router's enable mode by typing "enable" and the enable password if configured.
  • Enter the configuration mode by typing "configure terminal".
  • Enter the command "interface serial x/y/z" to configure each of the serial ports on the HWIC-4A/S module. Replace x/y/z with the slot number and port number of the serial port you want to configure (e.g. serial 0/0/0).
  • Configure the desired settings for each serial port using the appropriate commands. For example, to configure the serial port for asynchronous operation, enter the command "line 1 16" to specify the range of available asynchronous lines, then enter "no exec" to disable user access to the router's command prompt from the serial port, and finally enter "transport input all" to enable all types of input on the serial port.
  • Save your configuration changes by entering the command "write memory" to write the configuration to non-volatile memory.

That's it! You should now have successfully installed and configured the HWIC-4A/S module on your Cisco router, and be able to use the asynchronous/synchronous serial ports as desired.

Hardware and Technical Specifications

The HWIC-4A/S is a Cisco 4-port high-speed WAN interface card (HWIC) that provides asynchronous/synchronous serial connectivity for integrated services routers. The module offers four high-speed serial interfaces that can be configured as either asynchronous or synchronous ports, enabling communication with various devices, including modems, routers, switches, and other networking equipment.

Here are some technical specifications of the HWIC-4A/S:

  • Port Type: Four asynchronous/synchronous serial ports
  • Connector Type: DB-60 male (DTE)
  • Data Rate: Asynchronous up to 115.2 kbps, synchronous up to 8 Mbps
  • Protocols: HDLC, PPP, X.25, Frame Relay
  • Buffer Size: 64 KB per port
  • Operating Temperature: 32 to 104°F (0 to 40°C)
  • Dimensions (HxWxD): 0.8 x 3.1 x 4.7 inches (2.03 x 7.87 x 11.94 cm)
  • Weight: 0.16 lb (0.07 kg)

The HWIC-4A/S is designed for use with Cisco integrated services routers that support HWICs, such as the Cisco 1800, 1900, 2800, 2900, 3800, and 3900 series routers. The module is ideal for businesses that need to connect to remote sites or devices using serial interfaces, including those in retail, financial, healthcare, and government sectors.

Overall, the HWIC-4A/S provides reliable and flexible serial connectivity for various applications and is a great choice for businesses that require high-speed data transfer rates and extensive protocol support.

Setting up Async and Sync Serial Interfaces

The HWIC-4A/S is a Cisco expansion module that provides four serial ports, which can be configured as asynchronous (A) or synchronous (S) interfaces. These interfaces can be used for connecting devices such as modems, routers, switches, and other networking equipment.

To set up the async and sync serial interfaces on the HWIC-4A/S module, follow these steps:

  • Insert the HWIC-4A/S module into an available slot on the Cisco router or switch.
  • Power on the router or switch.
  • Access the router or switch command line interface (CLI) using a terminal emulator program such as HyperTerminal or PuTTY.
  • Enter the "enable" command to access privileged mode.
  • Enter the "configure terminal" command to enter global configuration mode.
  • Enter the "interface serial" command to access the serial interface configuration mode.
  • Enter the number of the serial port you want to configure (e.g. "interface serial 0/0/0" for the first port).
  • Enter the "no shutdown" command to bring the interface up.
  • Enter the "encapsulation" command to specify the protocol used on the interface. For asynchronous interfaces, use "encapsulation ppp" or "encapsulation slip". For synchronous interfaces, use "encapsulation ppp" or "encapsulation hdlc".
  • Enter any other necessary commands to configure the interface, such as IP addressing, clock rate, or data rate.
  • Repeat steps 7-10 for each serial port you want to configure.
  • Save the configuration using the "write memory" command.

By following these steps, you can set up the async and sync serial interfaces on the HWIC-4A/S module and begin using it for your networking needs.

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

About Refurbished Products

Refurbished products are typically refurbished by an Original Manufacturer or an affiliate of the manufacturer or 3rd party facility. This product may have minor blemishes due to normal product usage and doesn't necessarily come with documentation and software unless indicated, but has been well tested and generally has never had any defects.

For all your expansion module needs, we've got you covered with high-performance devices that increase functional capability and ease business processes.

You can talk to any of our staff and consult on what would be the best way forward when getting an expansion module to complement and enhance existing infrastructure, meet your immediate and future needs.

We have hardware level 12 with firmware 3.0 or higher modules that allow for the installation of up to 14 expansion modules below the base module for resilient performance. Expansion modules connect to the base module using USB Type-A connectors. That's not all, we have hardware level 11 and lower that supports up to 9 expansion modules.

With an expansion module, you get additional cartridge storage as well as tape drive capacity. We have expansion modules that contain up to two drives and two power supplies. You can choose to have the expansion module with tape drives and power supply installed so that it makes setup easier from your end. Expansion modules will need a power supply only if you install a tape drive in it. A single power supply can actually power two drives. However, you can add a second power supply for redundancy purposes. Without a tape drive, the expansion module is powered via the USB cable connected to the base module.

Expansion modules require 2U rack space and will be shipped with the necessary mounting hardware used to secure it to the rack.

The top features of the expansion modules we've listed include:

  • High-resolution LCD screens of up to 5" with backlight for a vibrant visual experience and ease of use. The expansion modules have programmable line keys ensuring that the interface is intuitive and interactive.
  • Straightforward setup to facilitate easy installation.
  • Availability of a wide range of custom configurations
  • Advanced call handling and contact management capabilities to help increase productivity.
  • XML browser functionality
  • Compatibility across systems which helps to leverage on existing IT infrastructure investment. All the expansion modules we've made available will help to enhance your existing desktop solutions.
  • Seamless fusion with planar and fiber technology
  • Compatibility with phone models such as SIP-T27P and SIP-T29G helping to expand functionality.
  • Availability of color icons that enhance the visual experience for users. There are color-coded independent actionable control keys that facilitate fast switching between pages.
  • Ability to link together a maximum of six phone systems and up to two expansion modules from a single host phone.
  • Support for up to 3 modules on a daisy-chain
  • Reduced excess loss and PDL
  • Support for advanced call functions including call forwarding, call transfers, multi-person conferencing, call pickup, LDAP, speed dial, and BFL list.
  • Shipped with a stand that has two adjustable angles

You can find almost every module option in our catalog, we have modules with different numbers of ports, from 1-port options to 50- and 90-port options, you can also check out our 20 Gigabit, 48 Gigabit, and 100 Gigabit expansion modules. Browse through our categories to find the best option for your needs.

All expansion modules make for ideal solutions for administrative assistants, receptionists, and contact center employees due to the ability to easily manage large call volumes and to monitor a large number of contacts.

Here, you can check more available conditions of your desired product HWIC-4A/S= at a competitive price. We are trying our best to meet your needs on the enterprise-level computer, server, data centre, and networking hardware. You are welcome to ask our live chat or get live representative support over the phone.


Please choose your location for calculate shipping cost.


ALLHDD guarantees that the products will not have defects in material that will affect the product's functionality during the Standard Warranty Period. The warranty period starts when the merchandise/items from our warehouse.

What does ALLHDD.Com warranty cover?

30-days to 3 years warranty:

Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

What is not covered by our warranty?

The reason why our warranty does not cover any problem caused by the following conditions:

(a) misuse of hardware; accidental damage; carelessness product(s) damage; shock; temperature beyond the specification of any product; faulty installation; operation; modification of goods;

(b) any misuse outside the instructions in the user manual for any specific product;

(c) damaged caused by other hardware or equipment. The warranty will void if the item is returned with physical damage, damage to the retail box, removed from the box, counterfeit labels/labelled by them, or any modifications of internal and external covers. Data loss or damages to any other equipment we do not cover by our offered warranty.

What is the Manufacturer/Brand Warranty?

In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).

For the server parts (i.e., Dell, HPE) to get Full coverage of the warranty server must have a full 3- 5 years warranty. However, ALLHDD.COM will cover the warranty duration if any Manufacturer doesn't support the advertised warranty and there is no refund for those.
Final Sale items are non-returnable/refundable in any situation. Any question? please ask our team before the shipment.

Important notes:

We can provide additional warranty service/support for any product you purchase from us if you need additional warranty coverage before finalizing the order from ALLHDD.Com. You need to ask in live chat/help or call us for more information.

Individual product warranty mentioned on each item product description page/detail page.

Free Technical support on purchased items, our expert consultancy over the phone, by email, by live chat, or by remote login.


Shipping Options and Estimated Delivery Time

UPS Shipping Options:

FREE UPS® Ground (Free shipping to all orders for 48 states!)
Estimated delivery time: 4-7 business days

UPS 3 Day Select®
Estimated delivery time: 3 business days

UPS 2nd Day Air®
Estimated delivery time: 1-2 business days, Delivery by 10:30 AM or 2:00 PM

UPS Next Day Air® Standard Overnight
Estimated delivery time: Overnight 2-5 PM, Standard Overnight Delivery.

UPS Next Day Air® - Priority Overnight
Estimated delivery time: Overnight Delivery (Next Business Day) Delivery by 10:30 AM or 12:00 PM

UPS Next Day Air® First Overnight - Early A.M
Estimated delivery time: Overnight 8:00 AM, Early morning, overnight delivery for your time-critical shipments.

UPS® First Overnight - Saturday
Estimated delivery time: Overnight 8:30 AM – Saturday

FedEx Shipping Options:

FedEx Ground®
Estimated delivery time: (4–7 business days in the contiguous 48 states)
*For residential delivery via FedEx Ground use FedEx Home Delivery®
Estimated delivery time: 4−7 business days, based on the distance to the destination.

FedEx Express Saver®
Estimated delivery time: 3 business days (by 4:30 PM to U.S. businesses; by 8:00 PM to residences)
Available throughout all 50 states (except Hawaii and Alaska)

FedEx 2Day®
Estimated delivery time: 2 business days (by 4:30 PM to U.S. businesses; by 8:00 PM to residences)
Available throughout all 50 states

FedEx Standard Overnight®
Estimated delivery time: Next-business-day (by 4:30 PM to U.S. businesses and by 8:00 PM to residences)
Available throughout all 50 states (Hawaii is outbound only)

FedEx Priority Overnight®
Estimated delivery time: Next-business-day (by 10:30 PM to U.S. businesses, noon to most residences)
Available throughout all 50 states

FedEx First Overnight®
Estimated delivery time: Next-business-day (by 8:30 or 9 AM to most areas)
Available throughout all 50 states

Worldwide Shipping Options:

UPS®/FedEx® International Economy

Estimated delivery time: 4-7 business days

UPS®/FedEx® International Priority

Estimated delivery time: 2-4 business days

UPS®/FedEx® Ground Shipping Canada

Estimated delivery time: 5-8 business days

Important notes:

  • The processing of orders with Ground Shipping can take up to 24-48 hours. But we try to process all orders the same day.
  • We are not responsible for weather problems that may affect the delivery of goods by carriers. We cannot guarantee the exact delivery time, regardless of the carriers' claims.
  • If you have any specific delivery time requirements, please contact our customer support and someone from our customer service team will be able to help you.
  • You can estimate the shipping cost from the products detail page, also available on the checkout page
  • The shipping cost depends on box dimensions, weight, and zip/postal code
  • To get a FedEx® delivery service you need to mention it on the checkout page notebox.
  • For urgent shipments, please contact our customer service.
  • Shipping cut off 4:00 PM (Monday-Friday) and available blind drop shipment.