BroadR Reach vs 100Base-Tx vs 1000Base-T | Difference between BroadR Reach, 100Base-Tx, 1000Base-T
This page compares BroadR Reach vs 100Base-Tx vs 1000Base-T and mentions difference between BroadR Reach, 100Base-Tx and 1000Base-T.
Introduction:
BroadR-Reach is broadcom point to point Ethernet PHY technology.
It is adopted by OPEN alliance which specifies PHY operating full duplex over one pair of
UTP (Unshielded Twisted Pair) cable at 100 Mbps.
BroadR-Reach is a hybrid of 100Base-Tx and 1000Base-T.
The difference between BroadR-Reach and previous ethernet standards is with respect to PHY layer. The upper levels of ethernet stack and topology is identical to 802.3 standard.
100Base-Tx
Following are the features of 100Base-Tx.
• It uses 3 level signaling
• Dual simplex
• MLT-3, 125 MSPS, 65 to 80 MHz Bandwidth
• Two twisted pairs
• Decision Feedback Equalization (DFE)
1000Base-T
Following are the features of 1000Base-T.
• It uses 5 level signaling
• Full duplex
• PAM-5, 125 MSPS, 65 to 80 MHz Bandwidth
• Four twisted pairs
• Partial reponse transmit filter
• Additional level for error correction coding
• Echo and crosstalk cancellation in DSP
• Decision Feedback Equalization (DFE)
BroadR-Reach
Following are the features of BroadR-Reach.
• It uses 3 level signaling
• Full duplex
• Echo cancellation
• PAM-3, 66.7 MSPS, 33.3 Bandwidth
• Single twisted pair
• Decision Feedback Equalization (DFE)
The major benefits of BroadR-Reach over traditional ethernets are as follows.
• Bandwidth is reduced by over 2 times.
• It operates over lower quality cabling.
• It permits aggressive filtering for improved emissions and immunity.
Following table summarize difference between BroadR Reach, 100Base-Tx and 1000Base-T types.
| BroadR-Reach | 100Base-Tx | 1000Base-T |
|---|---|---|
| 3 level, 66.67 MSPS, 33.33 MHz | 3 level, 125 MSPS, 65 to 80 MHz | PAM-5, 125 MSPS, 65 to 80 MHz |
| Full duplex | Half duplex | Full duplex |
| Single twisted pair | Two twisted pairs | Four twisted pairs |
Refer features of automotive ethernet and its requirement in automotive vehicles.
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