Accton Technology CheetaHub Power Fast Ethernet Dual-Speed Stackable Hubs manual State, Indication

CheetaHub Power-3008N/3016N

Restrictions on Cascade Length - When cascading to another repeater, note that the attached repeaters will function as a single logical repeater, with all ports attached to the same collision domain.

•10 Mbps Cascade - Based on the IEEE 802.3 recommendation, you may cascade up to four 10 Mbps hubs.

•100 Mbps Cascade - When cascading to a Fast Ethernet hub, limit the daisy- chain to two hubs. Another limitation for cascading Fast Ethernet concerns connection length. All end-node devices (e.g., workstations or servers) must be within 100 meters (328 feet) of the connected hub; and the overall length between any two nodes should not exceed 205 meters (672 feet). The easiest way to cascade two Fast Ethernet hubs is to connect the MDI daisy-chain port on the front panel to an MDI-X port on the other hub. For example, if both node A and B are linked to separate repeaters in a two hub system, each using 100 meters of cable to connect to their respective hub, then the inter-hub cabling will be limited to 5 meters (16 feet). The only way to extend the inter-hub cabling, would therefore be to reduce the length of the cabling used to attach the end nodes to the hubs.

•Ethernet Switch - There are no formal restrictions on cascade length if a device is connected to a switch, which effectively breaks up the collision domain. When a collision domain is broken up by a device like a switch, cascade length is limited only by the time-out requirements of the particular applications

running over the network.

Connecting to the Stack’s Backplane

Plug one end of the stacking cable (provided with this package) into the “Out” port of the top hub and the other end into the “In” port of the next hub. Repeat this step for each hub in the stack so that there is a simple chain starting from the “Out” port of the top hub and ending at the “In” port of the last hub.

You can stack up to six units using the stack ports.

Notes: 1. If more than one hub with internal switching (either the EH3008N-SW or EH3016N-SW) is placed in the stack, switching between stack segments will be managed by the highest unit in the stack, and internal switching will be disabled for all other units.

2.If any hubs in the stack are powered off, traffic flowing across the stack’s backplane will automatically bypass those units.

Powering On the Hub

1.Plug the power cord into the power socket at the rear of the hub, and the other end into a power outlet.

2.Check the LED marked Power on the front panel to see if it is on. The unit will automatically select the setting that matches the connected input voltage. Therefore, no additional adjustments are necessary when connecting it to any input voltage within the range marked on the rear panel.

Quick Installation Guide

Verifying Port Status

Check each connection by viewing the port status indicators shown in the following figure and table.

LED	State	Indication
Power	On (green)	Hub is receiving power.
Act	Flashing (green)	Traffic is traversing the 10M or 100M repeater bus.
Col	Flashing (yellow)	Packet collision detected in the 10M or 100M segment.
Link	On (green)	Port has established a valid 100M network connection.
	On (yellow)	Port has established a valid 10M network connection.
Partition	On (yellow)	The port has been partitioned from the network.
10M Util%	On (green/yellow)	10M segment utilization at 4/16/32% (green), 64% (yellow).
100M Util%	On (green/yellow)	100M segment utilization at 4/16/32% (green), 64% (yellow).
BNC	On (yellow)	Port partitioned from network. (EH3016N, EH3016N-SW only).

Verifying System Operation

Verify that all attached devices have a valid connection. The hub monitors the link status for each port. If any device is properly connected to the hub and transmitting a link beat signal, the Link indicator will light up for the corresponding port. If the Link indicator fails to light when you connect a device to the hub, check the following items:

•Be sure the twisted-pair cable is properly attached to the connected device and the hub. Verify that the media connector snaps into place when attached.

•See if your cable is functioning properly by using it for another port and attached device that displays valid indications when connected to the network.

•Check the length of each twisted-pair cable to be sure it does not exceed 100 meters (328 feet). If you have cascaded two Fast Ethernet hubs together, be sure the interhub cabling is no longer than 5 meters (16 feet).

•Verify that the workstation's adapter card is functioning properly by trying it in another computer that has been successfully connected to the network.

Applications

These dual-speed CheetaHubs allow great flexibility in configuring your network. You can use them in a stand-alone or multiple hub configuration to mix and match both legacy Ethernet and Fast Ethernet network resources on your local network. Moreover, you can easily extend your LAN by making a high-speed connection to a collapsed backbone device (e.g., a switch or a router).

Stand-Alone Network - The CheetaHubs with the internal switching function (EH3008N-SW, EH3016N-SW) can be used in a simple stand-alone configuration as illustrated in the figure below. Regardless of whether you are making 10 or 100 Mbps connections with twisted-pair cable, limit the distance for each cable to 100 meters (328 feet).

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