AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Note
In order for a switch port to successfully Auto-Negotiate its duplex mode with an end node, the end node should also be using Auto- Negotiation. Otherwise, a duplex mode mismatch can occur. A switch port using Auto-Negotiation will default to half-duplex if it detects that the end node is not using Auto-Negotiation. This will result in a mismatch if the end node is operating at a fixed duplex mode of full-duplex.
To avoid this problem, when you connect an end node with a fixed duplex mode of full-duplex to a switch port, you should use the AT-S62 management software to disable Auto-Negotiation on the port and set the port speed and duplex mode manually.
Maximum Distance
Each twisted pair port has a maximum operating distance of 100 meters (328 feet).
Type of Cabling
For 10 Mbps operation, Category 3 or better 100 ohm shielded or unshielded twisted pair cabling is required. For 100 Mbps operation, Category 5 or Enhanced Category 5 (5E) 100 ohm shielded or unshielded twisted pair cabling is required.
Auto-MDI/MDI-X
The twisted pair ports are auto-MDI/MDI-X. They automatically configure themselves as either MDI or MDI-X, depending on the configuration of the port on the end node. This feature allows you to use either straight-through or crossover twisted pair cables to connect devices to the ports.
Note
The auto-MDI/MDI-X feature on a port is available only when the port is set to Auto-Negotiation. If you disable Auto-Negotiation and set a port’s speed and duplex mode manually, the port defaults to MDI-X. For instructions on configuring a port, refer to the AT-S62 Management Software User’s Guides.
Port Pinouts
For the port pinouts for the AT-8524M, AT-8550GB, and AT-8550SP switches, refer to Table 12 on page 83. For the port pinouts for the AT-8524POE switch, refer to Table 13 on page 83.
