User manual ENCORE ENH905

[. . . ] Changes or modifications to the equipment, which are not approved by the party responsible for compliance, could affect the user's authority to operate the equipment. Copyright © 2002 All Rights Reserved. Company has an on-going policy of upgrading its products and it may be possible that information in this document is not up-to-date. [. . . ] This will ensure correct operation of all ports at 10Mbps or 100Mbps. 2. 2 Key Features The switch provides the following key features: Complies with 10BASE-T specifications of the IEEE802. 3 standard Complies with 100BASE-TX specifications of the IEEE802. 3u standard All RJ-45 ports for 100BASE-TX and 10BASE-T connectivity Supports NWay protocol for speed (10/100Mbps) and duplex mode (Half/Full) auto-detection Supports MDI/MDI-X auto crossover Supports full and half duplex operation on all ports Supports back-pressure (half duplex) and flow control (IEEE 802. 3x) Wire-speed packet filtering and forwarding rate Store-and-forward architecture filters fragment & CRC error packets Supports 2K MAC address entries in whole system 128KB buffer memory Supports extensive LED indicators for network diagnostics External power adapter FCC Class A, CE 4 2. 3 The Front Panel The front panel of the switch is shown below. The auto-negotiation feature of the switch allows each port of the device running at one of the following four operation modes: Speed 100 Mbps 10 Mbps Duplex Mode Half-duplex Full-duplex Half-duplex Full-duplex Each 10/100Mbps port supports auto MDI / MDI-X capability that is the port could connect either the PC or hub without any cable adjustment. 5 2. 3. 1 LEDs 2. 3. 1. 1 Power LED This indicator lights green when the switch is receiving power; otherwise, it is off. 2. 3. 1. 2 100M LED The 100M LED indicates the link speed of each port. If the LED lights green, the connection speed is 100Mbps, off for 10Mbps. Link/Act LED Every port has a Link/Activity LED. Steady green (link state) indicates that the port has good linkage to its associated devices. Flashing green indicates that the port is receiving or transmitting data between its associated devices. If the port is connected but the Link/Activity LED is dark, check the following items: 1. The switch and the connected device's powers are on or not 2. The cable is firmly seated in its connectors in the switch and in the associated device. The connecting cable is good and with correct type 4. The connecting device, including any network adapter is functioning. From the 100M and Link/Activity LED, we could judge the connection speed as following: 100M LED Off Off Green Link/Activity LED Off Green Green Status No Connection Connect as 10Mbps Connect as 100Mbps 2. 3. 1. 3 6 2. 3. 1. 4 FDX/COL LED A collision occurs when two stations within a collision domain attempt to transmit data at the same time. Intermittent flashing amber of the LED is normal; the contending adapters resolve each collision by means of a wait-then-retransmit algorithm. Frequency of collisions is a message of heavy traffic on the network. [. . . ] Therefore, the content of the MAC table will update dynamically. 4. 2 Filtering and Forwarding When one packet comes in from any port of the switch, it will check the destination address besides the source address learning. The switch will look up the address table for the destination address. If not found, this packet will be forwarded to all the other ports except the port where this packet comes in. [. . . ]