10 Mbps cable specifications This is an ASCII file called CABLE10.TXT in the Allied Telesyn CardAssistant INFO directory. Use a text editor or a word processor with a mono-space font such as Courier to print this file if needed for reference. ************************************************************ ** ** ** Specifications and recommendations for 10 Mbps cabling ** ** ** ************************************************************ NOTE: For 100 Mbps operation, refer to the "100 Mbps cabling specifications" information file. This document covers the following topics: Unshielded Twisted-Pair Cabling (UTP) =================================== The Allied Telesyn AT-2500TX PCI 10/100 Ethernet adapter has a RJ-45 connector for use with UTP cabling. For more information on the 10BaseT specification, contact your local network supplier or call the IEEE at 800-678-IEEE. Recommended cables ------------------ The RJ45 connector can use 22, 24, or 26-gauge UTP cabling. The cable must comply with the IEEE 802.3 10BaseT standard. The cable between the computer and the hub or switch must be no more than 100 meters long. These UTP cables work well: Manufacturer Model number No. of pairs ---------------------------------------------------- Belden 9562 2 Data Set 2402 4 Belden 9566 6 Belden 1588A 2 Silver Satin is not within the 10BaseT specification and may not work or may work intermittently. Cable and connector pinouts --------------------------- If you need to repair a cable or provide connectors for UTP cable, wire straight through as shown in the following table.(A very few applications require a cross-over cable. To allow for a straight-through cable, the vast majority of hubs and switches provide an internal transmit/receive crossover function. This means the transmit circuit of the network card is connected to the receive circuit of the hub and vice-versa. Many hubs also have an external interface switch, the MDI/MDI-X switch. Straight-through cable pinout: Function Pin# Pin# ----------------------------------- TX+ 1 <--------> 1 TX- 2 <--------> 2 RX+ 3 <--------> 3 RX- 6 <--------> 6 Cross-over cable pinout: Function Pin# Pin# ----------------------------------- TX+ 1 <--------> 3 TX- 2 <--------> 6 RX+ 3 <--------> 1 RX- 6 <--------> 2 10BaseT and 100BaseTX uses only four of the eight pins. Pins 1 and 2 must be a pair within the cable, and pins 3 and 6 must be a pair. Link integrity ============== There are three LEDs on the Allied Telesyn AT-2500TX PCI adapter: 100 light for 100 Mbps operation ACT light for activity LNK light for link (10Mb or 100Mb) Refer to the "Diagnostic LEDs" information file for brief descriptions. Note: The ACT LED indicates read/write activity on the network, not necessarily activity on the adapter. Common problems =============== No Link Light -------------------------------- 1. Check to cable pinout. Make sure the cable is a straight-through when connecting to a hub, or a cross-over cable if connected to another network interface card (workstation or server). 2. Make sure that the link light on both sides of the connection is on, ie both the AT-2500 and the device it is connected to has the link light illuminated. If the AT-2500 is not showing link, check the receive pair for the bad connection (pins 3 and 6). Conversely, check the transmit pair (pins 1 and 2) if the device on the other side has no link light illuminated. Workstations cannot connect to a server ----------------------------------------- 1. Check to make sure the same protocol is being used by the workstation and the server, i.e. TCP/IP, IPX/SPX, Netbeui, etc. 2. Check for frame type mismatches with Novell NetWare servers. For example, the server is set to use the 802.2 frame type, but the workstation is using the 802.3 frame type. 3. Check for valid TCP/IP address, router, and DNS (Domain Name Server) settings when browsing the Internet, or Intranet Web-servers. High Amount of Collisions ------------------------- This is usually caused by a loose connection, or by exceeding the recommended limit of 100 meters (~333 ft.). Try a different cable. Also check for duplex mismatches (half vs. full) between the two devices. ------------------------- When all else fails, cycle power on your hub or switch to clear any anomalies that may be occurring internally. Polarity problems ----------------- A common problem in 10BaseT wiring is crossing the positive and negative phases of the transmit and receive signals (for example, crossing pins 1 (TX+) and 2 (TX-)). Follow the EIA/TIA 768b specification to ensure proper polarity. * Third-party trademarks are the property of their respective owners.Download Driver Pack
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