Many papers and articles have been contributed to the comparison between copper cabling and fiber cabling. Admittedly, fiber optic cabling have advantages over copper lines in terms of speed, capacity, bandwidth, etc. But this article will touch on another topic about copper-based Ethernet: 1000BASE-T vs. 1000BASE-TX.

The 1000BASE designation is an IEEE shorthand identifier. The "1000” in the media type designation refers to the transmission speed of 1000 Mbps. The "BASE” refers to base-band signaling, which means that only Ethernet signals are carried on the medium. The physical layer standard available for 1000 Gigabit Ethernet is twisted-pair cables (1000BASE-T). Before a deep discussion about comparison between 1000BASE-T and 1000BASE-TX is going on, the respective introduction to these two standards is included.

1000BASE-T (also known as IEEE 802.3ab) is a standard for Gigabit Ethernet over copper wiring. It uses four pairs of Category 5 unshielded twisted pair to achieve the Gigabit data rate. Each 1000BASE-T network segment can be a maximum length of 100m (330 feet). Typical applications of 1000BASE-T involve server witching in data centers, uplinks from desk computer switches. Or it is used directly to the desktop for broadband applications. Nowadays, 1000BASE-T modules are still widely used for Gigabit Ethernet transmission. For example, Fiberstore’s compatible Cisco 1000BASE-T Copper RJ45 (SFP-GE-T) operates on standard Category 5 unshielded twisted-pair copper cabling with link lengths up to 100 m, and supports LAN 1000Base-T Fibre Channel, switch to switch interface, server interface, and so on.

1000BASE-TX, also known as TIA/EIA-854, was a standard created and promoted by the Telecommunications Industry Association (TIA). This standard is similar to 1000BASE-T, but uses two pairs of wires for data transmission: one for sending data at speeds of 500Mbps, and the other for receiving data at comparable speeds on Category 6 or 7 cables. Though the simplified design of 1000BASE -TX has, in theory, reduced the cost of the required electronics by two pairs of wires, actually, this 1000BASE-TX solution has not been widely recognized because of the high costs of the required Category 6 and 7 cables and the falling price of 1000BASE-T products.

First, let's begin with their designs to differ the two standards. The 1000Base-T configuration adds a significant amount of complexity because of the bi-directional transmission (two-way transmission on a single pair). This design requires the use of hybrids to separate the transmission path from the receive path.It also requires high-powered digital signal processors (DSPs) to cancel the echoes generated by the near and far-end hybrids. By contrast, the design of 1000BASE-TX is simpler, requiring no hybrids, nor echo cancellation.

Second, difference lies in their transmission aspects. Each employs a different transmission technique and bit rate. 802.3ab (1000Base-T) calls for a 250 Mbits/sec bit rate, applied bi-directionally on each of the four pairs, in full duplex, while TIA/EIA-854 (1000Base-TX) calls for a 500 Mbits/sec bit rate, applied unidirectionally on each pair, so that the transmit path is physically separated from the receive path.

Last, the difference falls on cost. Just as what has been discussed above, the design of 1000Base-TX does not require hybrids, but its requirements for electronics and Category 6 and 7 cables are more expensive than 1000BASE-T configuration requirements.

After discussion, you may already have a choice in your mind as which one is better to be deployed according to budget and application of your project. As for 1000BASE-T SFPs, Fiberstore supplies 100% compatible copper SFP modules for your copper Ethernet. Besides Cisco SFP-GE-T, HP JD089B can also be found in Fiberstore. Of course, Fiberstore 1000BASE-T Auto Negotiation 1000BASE-TRJ45 Copper SFPs are also in large stock. You can visit Fiberstore to find a suitable 1000BASE-T SFP module for your copper network.

Posted by: fernxu123 at 03:46 AM | No Comments | Add Comment
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