Chapter 3: Troubleshooting

ˆVerify that the operating specifications of the fiber optic port on the remote network device are compatible with the port on the media converter. For port specifications, refer to “100Base-FX Port Specifications” on page 55.

ˆVerify that the correct type of fiber optic cabling is being used. For specifications, refer to “Fiber Optic Cabling and Distance Specifications” on page 35 or “100Base-FX Port 1 Specifications” on page 55.

ˆTry connecting another network device to the fiber optic port using a different cable. If the twisted pair port is able to establish a link, then the problem is with the cable or the other network device.

ˆIf the remote network device is a management device, use its management firmware to determine whether its port is enabled.

ˆTest the attenuation on the fiber optic cable with a fiber optic tester to determine whether the optical signal is too weak (i.e., sensitivity) or too strong (i.e., maximum input power). The specifications of the fiber optic ports on the media converter can be found in “100Base-FX Port 1 Specifications” on page 55.

Problem 4: The Link LEDs for the two ports are on but the network devices are unable to forward traffic to each other through the media converter.

Solution: Try the following:

ˆIf the network devices are managed devices, use their management firmware to determine whether they are configured and operating properly.

ˆIf one of the network devices is a switch using a spanning tree protocol, use its management firmware to determine the status of the switch port connected to the media converter. The port may have been placed in the blocking mode by the switch if it is part of a redundant path.

Problem 5: Two network devices are forwarding traffic through the media converter, but performance is slow.

Solution: Try the following:

ˆThere might be a duplex mode mismatch between the twisted pair port and the network device connected to the port. A duplex mode mismatch occurs when a twisted pair port using Auto-Negotiation is connected to a device with a fixed duplex mode of full duplex. If this is the cause of the problem, you must adjust the duplex mode of the port on the network device or the twisted pair port on the media converter so that both ports are using the same duplex mode.

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Section II: Advanced Operations

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Allied Telesis AT-PC232/POE manual Troubleshooting
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AT-PC232/POE specifications

Allied Telesis AT-PC232/POE is a versatile and robust power-over-Ethernet (PoE) switch that effectively meets the needs of small to medium-sized networks. Designed for user-friendly operation and scalability, this switch caters to the increasing demand for power and data connectivity in various environments, from small offices to larger enterprise applications.

One of the main features of the AT-PC232/POE is its capability to deliver both data and electrical power over a single Ethernet cable. This functionality simplifies installations of network devices such as IP cameras, VoIP phones, and wireless access points, reducing cabling costs and improving site aesthetics. The switch can supply up to 15.4 watts of power per port, adhering to the IEEE 802.3af PoE standard. This enables straightforward connection to devices without needing additional power sources, making it a convenient choice for businesses looking to streamline their operational efficiency.

In terms of design, the AT-PC232/POE is compact and rack-mountable, allowing for efficient use of space in server rooms and network closets. Its fanless operation ensures quiet performance, making it suitable for noise-sensitive environments. The switch is also equipped with LED indicators that provide at-a-glance updates on power status, network activity, and port statistics.

The AT-PC232/POE utilizes advanced networking technologies such as VLAN (Virtual Local Area Network) support and QoS (Quality of Service). VLAN support allows network administrators to segment network traffic for better performance and security, while QoS capabilities prioritize critical data packets, ensuring that important applications such as video conferencing and VoIP operate smoothly without interruption.

Another significant characteristic of this switch is its management capabilities. Allied Telesis provides a web-based graphical user interface (GUI) for easy configuration and monitoring, allowing administrators to quickly set up networks and troubleshoot issues. Security features such as port security and access control lists help prevent unauthorized access and ensure that the network remains secure.

In summary, the Allied Telesis AT-PC232/POE switch combines efficient power delivery with sophisticated networking features, making it an excellent choice for businesses looking to enhance their network infrastructure. Its compact design, ease of use, and management capabilities position it as a reliable solution for modern networking demands.
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