| • Science | • People | • Locations | • Timeline |
10BASE-T uses RJ-45 jacks wired to either the TIA-568A or TIA-568B standard. Only the second and third pairs are used (orange and green). If the wiring standard is identical on both ends the segment is a patch cable suitable for transmission between a hub/switch/patch panel and a node. If the wiring standards are opposite on either end the segment is a crossover cable suitable for connecting a node to a node or a hub/switch to another hub/switch. The EIA/TIA 586 standards are as follows:
| Pin | Pair | Wire | Color |
|---|---|---|---|
| 1 | 3 | 1 | white/green |
| 2 | 3 | 2 | green/white |
| 3 | 2 | 1 | white/orange |
| 4 | 1 | 2 | blue/white |
| 5 | 1 | 1 | white/blue |
| 6 | 2 | 2 | orange/white |
| 7 | 4 | 1 | white/brown |
| 8 | 4 | 2 | brown/white |
| Pin | Pair | Wire | Color |
|---|---|---|---|
| 1 | 2 | 1 | white/orange |
| 2 | 2 | 2 | orange/white |
| 3 | 3 | 1 | white/green |
| 4 | 1 | 2 | blue/white |
| 5 | 1 | 1 | white/blue |
| 6 | 3 | 2 | green/white |
| 7 | 4 | 1 | white/brown |
| 8 | 4 | 2 | brown/white |
10BASE-T was the first vendor-independent standard implementation of Ethernet on twisted pair wiring. However, it was in fact an evolutionary development from AT&T StarLAN which had both 1 Mbit/s and 10 Mbit/s versions. 10BASE-T is essentially StarLAN-10 with the addition of the link-beat.
In the OSI model, 10BASE-T is at the physical layer. Ethernet encompasses both addressing at the data link layer and a number of physical-layer implementations. In this model, 10BASE-T is one of the possible physical layer standards for ethernet-- some others include 10BASE2, 10BASE5, and 100BASE-TX100BASE-TX is the predominant form of Fast Ethernet, providing 100 Mbit/s Ethernet. 100BASE-TX runs over two pairs of wires in category 5 cable. Like 10BASE-T, the proper pairs are the orange and green pairs (canonical second and third pairs) in the TIA-5. Network layerThe network layer is level three of the seven level OSI model. It responds to service requests from the transport layer and issues service requests to the data link layer. The network layer addresses messages and translates logical addresses and names int protocols, such as IPThe Internet Protocol IP is a data-oriented protocol used by source and destination hosts for communicating data across a packet-switched internetwork. Data in an IP internetwork are sent in blocks referred to as packets or datagrams (the terms are basica, do not generally need to know whether they are being hosted on 10BASE-T or not, provided they know that they are being hosted on Ethernet.