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- 100 Mbps cabling specifications
- v1.06
-
-
- 100 Mbps cabling specifications for Intel 82557-based PCI adapters:
-
- EtherExpress(TM) PRO/100B - TX
- EtherExpress(TM) PRO/100B - T4
-
-
- The EtherExpress PRO adapters have a small, snap-in RJ45 connector. RJ45
- cabling is also known as Twisted-pair Ethernet (TPE), Unshielded twisted
- pair (UTP), and 10BASE-T cabling.
-
- The type of cabling you must use depends on the adapter you're using.
-
- This document covers the following topics:
-
- - EtherExpress PRO/100B - TX adapters
- - EtherExpress PRO/100B - T4 adapters
- - Link integrity
- - Common problems
-
- NOTE: For 10 Mbps operation, refer to the 10 Mbps cabling
- specifications help file.
-
-
-
- EtherExpress PRO/100B TX adapters
- =================================
-
- Recommended cables
- ------------------
-
- The cable must comply with the IEEE 802.3 10BASE-T standard for 2-pair,
- Category 5, UTP cable. Select a high-quality brand of Category 5 cable
- from your local supplier.
-
- The cable between the computer and the hub must be less than 100 meters
- long.
-
- EtherExpress PRO/100B TX adapters do not 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, the hub provides 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 (TD+). The positive signal for the TD differential
- pair. This signal contains the serial output data stream transmitted
- onto the network.
-
- 2 Transmit Data Minus (TD-). The negative signal for the TD differential
- pair. This contains the same output as pin 1.
-
- 3 Receive Data Plus (RD+). 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 (RD-). 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
- -----------------------------------------
-
- 100BASE-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. The table below shows which wires need to be crossed over.
-
-
- 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.
-
-
-
-
-
- EtherExpress PRO/100B T4 adapters
- =================================
-
- When operating at 100 Mbps, the cable must comply with the IEEE 802.3u
- 100BASE-T4 specification. Select a high-quality brand of Category 3, 4,
- or 5 cable from your local supplier. Note that 100BASE-T4 configurations
- require using all four pairs of wires.
-
- The cable between the computer and the hub must be less than 100 meters
- long.
-
- The EtherExpress PRO/100B T4 adapters do not support pre-10BASE-T
- concentrators.
-
-
- Cable and connector pinouts
- ---------------------------
-
- Unlike TX cabling, T4 cabling does not use separate, dedicated pairs to
- transmit or receive data. T4 cabling uses all four pairs of wires. Three
- pairs are used to transmit data, while the fourth pair is used to detect
- collisions.
-
- Pin pairings are as follows:
-
- Pins 1 and 2 must be a pair. (TX function)
-
- Pins 3 and 6 must be a pair. (RX function)
-
- Pins 4 and 5 must be a pair. (Bidirectional)
-
- Pins 7 and 8 must be a pair. (Bidirectional)
-
- The pinout is as follows:
-
- Function Pin# Pin#
- -----------------------------------
- TX D1+ 1 <--------> 1
- TX D1- 2 <--------> 2
- RX D2+ 3 <--------> 3
- BI D3+ 4 <--------> 4
- BI D3- 5 <--------> 5
- RX D2- 6 <--------> 6
- BI D4+ 7 <--------> 7
- BI D4- 8 <--------> 8
-
-
-
- To allow for a straight-through cable, the hub provides 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.
-
- Connecting two 100BASE-T4 workstations without a 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. The table below shows which wires need to be crossed over.
-
-
- Function Pin# Pin# Function
- ----------------------------------------------
- TX+ 1 <--------> 3 RX+
- TX- 2 <--------> 6 RX-
- RX+ 3 <--------> 1 TX+
- RX- 6 <--------> 2 TX-
- BI D3+ 4 <--------> 7 BI D4+
- BI D3- 5 <--------> 8 BI D4-
- BI D4+ 7 <--------> 4 BI D3+
- BI D4- 8 <--------> 5 BI D3-
-
- NOTE: This is not an IEEE supported configuration and should be
- used for test purposes only.
-
-
-
-
- Link integrity
- ==============
-
- There are three LEDs on the EtherExpress PRO/100B T4 and TX adapters:
-
- 1. A LNK light for link
-
- 2. An ACT light for activity
-
- 3. A 100 light which indicates a 100 Mbps connection
-
- 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
- -----------------------------------------
-
- Make sure hub port is configured to the correct speed. Also, make sure
- last line in the NET.CFG file reads:
-
- lastdrive=F (for NETX systems)
-
- or
-
- lastdrive=Z (for VLM systems)
-
- Also try resetting the concentrator or hub or turn the power off and on.
-
-
- Polarity problems
- -----------------
-
- A common problem in 10BASE-T wiring is crossing the positive and negative
- phases of the transmit or receive signals (for example, crossing pins 1
- (TX+) and 2 (TX-)).
-
- EtherExpress PRO/100B 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.
-
-
-
- * Third-party trademarks are the property of their respective owners.
-