WS-C3750G-48PS-S

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.