Cisco WS-C3750G-48PS-S Ethernet Switch
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WS-C3750G-48PS-S Cisco Catalyst 3750 48 Ports Manageable Refurbished

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Part Number#: WS-C3750G-48PS-S
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Short Description:
WS-C3750G-48PS-S Catalyst 3750 Series 48 Ports 10/100/1000T RJ-45 Power Over Ethernet (PoE) Manageable Layer 3 Rack Mountable Ethernet Switch | Made by Cisco | Refurbished

Interface Types of This Product: Switch 48 Port

Product Condition:
Warranty provided by ALLHDD.COM:
90 Days
We are providing specifications below to explain why you should consider purchasing the Cisco 48 Port Switch Networking, including a general overview, performance specifications, relevant images, media files, and technical information about the WS-C3750G-48PS-S compatibility.

Power Supply and Power Consumption Considerations

The WS-C3750G-48PS-S Cisco Catalyst 3750 48 Ports Manageable Switch has two power supply options: a 715W AC power supply and a 440W DC power supply. When selecting a power supply, consider the following factors:

  • Power Consumption of the Switch:
    • The power consumption of the switch is dependent on the number of ports used, the type of modules installed, and the level of network activity.
    • The WS-C3750G-48PS-S switch has a maximum power consumption of 530W.
  • Redundancy:
    • It is recommended to have redundant power supplies for high availability and to ensure uninterrupted operation in the event of a power supply failure.
    • The switch can support up to two power supplies, and they can be configured in either redundant or combined mode.
  • Power Supply Compatibility:
    • Ensure that the selected power supply is compatible with the switch and the power input voltage.
    • The 715W AC power supply can accept an input voltage range of 100-240VAC, while the 440W DC power supply can accept an input voltage range of -40 to -60VDC.
  • Environmental Conditions:
    • Consider the environmental conditions of the installation site, such as temperature and humidity, which can affect the performance and lifespan of the power supply.
  • Power Management:
    • Configure power management settings to optimize power usage and reduce energy costs.
    • The switch supports features such as Energy Efficient Ethernet (EEE) and Power over Ethernet (PoE) to help conserve power.

When configuring the switch, use the "show power inline" command to check the power consumption of each PoE device connected to the switch. Use the "show power" command to check the power supply status and power usage of the switch.

It is important to properly size and configure the power supply to ensure reliable operation and prevent power-related issues. It is recommended to consult the Cisco documentation or consult with a certified Cisco professional for specific power supply and power consumption considerations for the WS-C3750G-48PS-S switch.

Troubleshooting Common Issues on the Switch

When troubleshooting common issues with the WS-C3750G-48PS-S Cisco Catalyst 3750 48 Ports Manageable Switch, you can use the following steps:

  • Check Physical Connections:
    • Ensure that all cables are securely connected to the switch and the external devices.
    • Verify that the power and status LEDs are illuminated on the switch.
  • Check Interface Status:
    • Use the "show interface" command to check the status of the switch interfaces. For example, "show interface GigabitEthernet1/0/1" displays the status of interface GigabitEthernet1/0/1.
    • Verify that the interface is up and running, and that the link status is also up.
  • Check VLAN Configuration:
    • Use the "show vlan" command to check the VLAN configuration of the switch. Verify that the VLANs are configured correctly and match the requirements of the external devices.
    • Check that the switch ports are assigned to the correct VLANs.
  • Check for Errors:
    • Use the "show interface" command to check for errors on the switch interfaces. Look for errors such as CRC errors, input/output errors, or framing errors.
    • If errors are present, try resetting the interface by using the "shutdown" and "no shutdown" commands.
  • Check for Spanning Tree Protocol (STP) Issues:
    • Use the "show spanning-tree" command to check the STP configuration of the switch. Verify that the STP settings are correct and match the requirements of the external devices.
    • Check that the switch ports are in the correct STP state.
  • Check for Quality of Service (QoS) Configuration:
    • Use the "show running-config" command to check the QoS configuration of the switch. Verify that the QoS settings are correct and match the requirements of the external devices.
    • Check that the switch ports are assigned to the correct QoS classes.
  • Check for Firmware Updates:
    • Check for any available firmware updates on the Cisco website and download the latest firmware if available.
    • Upgrade the firmware using the "copy" command and verify that the upgrade was successful.

Configuring Quality of Service (QoS) on the Switch

To configure Quality of Service (QoS) for WS-C3750G-48PS-S Cisco Catalyst 3750 48 Ports Manageable Switch, you can follow these steps:

  • Determine your QoS requirements:
    • Identify which traffic requires priority and which traffic can tolerate delay or packet loss.
    • Determine the amount of bandwidth required for each traffic class.
  • Configure QoS settings on the switch:
    • Use the "class-map" command to create traffic classes based on the requirements identified in step 1. For example, "class-map voice" creates a traffic class for voice traffic.
    • Use the "policy-map" command to create QoS policies for each traffic class. For example, "policy-map voice-policy" creates a policy for the voice traffic class.
    • Use the "priority" command to assign a priority queue to the voice traffic class. For example, "priority percent 50" assigns 50% of the available bandwidth to the voice traffic class.
    • Use the "bandwidth" command to allocate bandwidth to other traffic classes. For example, "bandwidth percent 30" allocates 30% of the available bandwidth to the video traffic class.
  • Apply QoS policies to switch ports:
    • Use the "interface" command to select the switch port to apply the QoS policy to. For example, "interface GigabitEthernet1/0/1" selects port GigabitEthernet1/0/1.
    • Use the "service-policy" command to apply the QoS policy to the selected port. For example, "service-policy input voice-policy" applies the voice QoS policy to the selected port.
  • Verify QoS configuration:
    • Use the "show policy-map interface" command to verify that the QoS policy is applied to the correct ports and traffic classes.
    • Use the "show interface" command to verify that the QoS settings are being applied correctly and that there are no errors or drops on the port.

General Information about this Cisco WS-C3750G-48PS-S

  • Manufacturer: Cisco
  • Model Number or SKU# WS-C3750G-48PS-S
  • Product Line: Catalyst
  • Product Series: 3750
  • Product Model: 3750G-48PS
  • Product Type: Ethernet Switch

Interfaces / Ports of L3 Ethernet Switch

Performance of 48 Ports Switch

  • Media Type Supported: Twisted Pair
  • Twisted Pair Cable Standard: Category 5
  • Ethernet Technology: Gigabit Ethernet
  • Network Technology: 10Base-T
  • Network Technology: 10/100/1000Base-T
  • MTBF: 141005 Hours

I/O Expansions

  • Number of Total Expansion Slots: 4
  • Expansion Slot Type: SFP
  • Number of SFP Slots: 4

Network & Communication

  • Layer Supported 3

Management & Protocols

  • Manageable: Yes


  • Standard Memory: 128 MB
  • Memory Technology: DRAM
  • Flash Memory: 32 MB

Power Description

  • Input Voltage: 110 V AC
  • Input Voltage: 220 V AC
  • Power Source: Power Supply
  • Redundant Power Supply: Yes

Dimensions & Weight

  • Height: 1.7 Inch
  • Width: 17.5 Inch
  • Depth: 16.1 Inch
  • Weight: 15.43 Lbs

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.

Different Types of Switches

Networking switches vary widely depending on the number of devices they can support, network bandwidth/speed, and form factor. Switches for small offices will have anything between 4 and 8 ports and can fit on a desk. For larger office network implementation, switches may have 24 ports, 48 ports, 96 ports, and 128 ports and are rack-mountable between 1U and 4U. Switches come in different types depending on the network speed and tasks they support. These include 40/100 Gbps, 10 Gigabit (up to 10000 Mbps), Gigabit Ethernet (up to 1000 Mbps), Power over Ethernet, and Fast Ethernet (10/100 Mbps).

Unmanaged Switches

The unmanaged switches offer fixed configuration on a plug-and-play basis. It is the most basic switch and there are a few choices in the market. These switches are affordable, but the basic features make them inappropriate for enterprise applications.

Managed Switches

The number of features and level of functionality improves with managed switches, making them ideal for enterprise and business applications. These switches are built with the command-line interface for ease of configuration. Equally, they support SNMP agents that come in handy when troubleshooting network issues.

The security on managed switches is better and will protect different types of traffic. Other features include support for virtual LANs, IP routing, and quality of service settings. Managed switches are more expensive compared to all other types of switches.

Smart Switches

Smart switches refer to switches that possess more features than those of unmanaged switches but do not have the full features of managed switches. Smart switches are more cost-effective than managed switches.

Some of the limitations of the smart switches are a lack of telnet access support, Web GUIs, and a lack of many features for VLANs. They are affordable compared to a fully managed switch and are suitable for a smaller computer network.

Modular Switches

Modular switches allow the addition of expansion modules as the network expands. The expansion modules allow for more networked devices but are application-specific. They may include wireless access points, firewalls, or network analysis tools. The flexibility of a modular networking switch comes at a higher cost.


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