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- 10 Mbps cabling specifications
- v1.05
- ******************************************************************
- 10 Mbps cabling specifications for Intel 82557-based PCI adapters:
- EtherExpress(TM) PRO/100B - TX
- EtherExpress(TM) PRO/100B - T4
- ******************************************************************
-
-
- Specifications and recommendations for 10 Mbps cabling
- ======================================================
-
- NOTE: For 100 Mbps operation, refer to the 100 Mbps cabling
- specifications help file.
-
- This document covers the following topics:
-
- Twisted-Pair Ethernet (TPE) cabling
- ===================================
-
- The EtherExpress PRO adapters have a snap-in RJ-45 connector for use with
- TPE cabling. TPE cabling is also known as RJ-45 cabling, Unshielded
- Twisted Pair (UTP), and 10BASE-T cabling.
-
- For more information on the 10BASE-T 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 10BASE-T standard for Category 3, 4,
- or 5.
-
- The cable between the computer and the hub must be less 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
-
- Silver Satin is not within the 10BASE-T specification and may not work or
- may work intermittently.
-
- 82557-based PCI adapters don't support pre-10BASE-T concentrators.
-
- 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.
-
- Function Pin# Pin#
- ------------------------------------
- TX+ 1 <--------> 1
- TX- 2 <--------> 2
- RX+ 3 <--------> 3
- RX- 6 <--------> 6
-
- Use only four of the eight pins. Pins 1 and 2 must be a pair, and pins 3
- and 6 must be a pair.
-
- To allow for a straight-through cable, hubs 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.
-
- Pinout for the RJ45 connector
- -----------------------------
- ---------- -------------------------
- 1 |-- | 8 |------------ |
- 2 |-- | 7 |------------ |
- 3 |-- --- 6 |------------ |
- 4 |-- | 5 |------------ |
- 5 |-- | 4 |------------ |
- 6 |-- --- 3 |------------ |
- 7 |-- | 2 |------------ |
- 8 |-- | 1 |------------ |
- ---------- -------------------------
- END TOP
-
- Pin name and function:
-
- 1 Transmit Data Plus. The positive signal for the TD differential pair.
- This signal contains the serial output data stream transmitted onto
- the network.
-
- 2 Transmit Data Minus. The negative signal for the TD differential pair.
- This contains the same output as pin 1.
-
- 3 Receive Data Plus. The positive signal for the RD differential pair.
- This signal contains the serial input data stream received from the
- network.
-
- 4 Not used.
-
- 5 Not used.
-
- 6 Receive data minus. The negative signal for the RD differential pair.
- This signal contains the same input as pin 3.
-
- 7 Not used.
-
- 8 Not used.
-
- Connecting two workstations without a hub
- -----------------------------------------
-
- 10BASE-T uses a star topology. This means a hub or concentrator is in the
- center of a star, and each workstation or server is connected to this
- hub.
-
- For test purposes, you can directly connect two workstations or a
- workstation and a server without using a hub. This setup requires a
- special cable incorporating the crossover function described earlier in
- this document.
-
- Function Pin# Pin# Function
- ----------------------------------------------
- TX+ 1 <--------> 3 RX+
- TX- 2 <--------> 6 RX-
- RX+ 3 <--------> 1 TX+
- RX- 6 <--------> 2 TX-
-
- NOTE: This is not an IEEE-supported configuration and should be used for
- test purposes only.
-
-
-
- Link integrity
- ==============
-
- There are two or three LEDs on Intel PRO adapters:
-
- 1. A LNK light for link
-
- 2. An ACT light for activity
-
- 3. 100 Mbps models also have a 100 light
-
- Refer to your adapter Installation Guide or the "Diagnostic LEDs" Readme
- file for complete information.
-
- Note: The ACT LED indicates read/write activity on the network, not
- necessarily activity on the adapter.
-
-
- Common problems
- ===============
-
-
- A hub can't detect a workstation
- --------------------------------
-
- This is often the result of a crossed wire in the cable or wiring closet.
- Make sure the wiring is correct.
-
-
- Workstations can't connect to the network
- -----------------------------------------
-
- Reset or power off/on your concentrator or hub.
-
-
- Polarity problems
- -----------------
-
- A common problem in 10BASE-T wiring is crossing the positive and negative
- phases of the transmit and receive signals (for example, crossing pins 1
- (TX+) and 2 (TX-)).
-
- EtherExpress PRO adapters automatically detect this problem and adjust
- for it internally. However, it's best to check your wiring and correct
- this problem if you find it.
-
-
-
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-