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LRE - Long Reach Ethernet
Long Reach Ethernet is a technology used by Cisco to extend the distance at
which an Ethernet device may operate. Normally, Ethernet, Fast Ethernet,
and Gigabit Ethernet over copper can only travel 100 meters (328 feet) and be
within specified operational parameters. LRE can reach distances as far as
3500 to 5000 feet depending upon wiring conditions, desired data rates, and
profiles used. Higher transfer rates imply shorter distances.
The following table is reproduced from Cisco documentation and defines the
default profiles defined within LRE equipment and their theoretical operational
speeds and signal to noise ratios.
| Profile Name |
Downstream
Rate (Mbps) |
Upstream
Rate (Mbps) |
SNR Down |
SNR Up |
| LRE-15 |
16.667 |
18.750 |
31 |
25 |
| LRE-10 (default) |
12.500 |
12.500 |
25 |
19 |
| LRE-5 |
6.250 |
6.250 |
16 |
13 |
| LRE-998-15-4 |
16.667 |
4.688 |
31 |
25 |
| LRE-997-10-4 |
12.500 |
4.688 |
31 |
25 |
| LRE-15LL |
16.667 |
18.750 |
31 |
25 |
| LRE-10LL |
12.500 |
12.500 |
25 |
19 |
| LRE-5LL |
6.250 |
6.250 |
16 |
13 |
| LRE-10-5 |
12.500 |
6.250 |
25 |
13 |
| LRE-10-3 |
12.500 |
3.125 |
25 |
19 |
| LRE-10-1 |
12.500 |
1.563 |
25 |
13 |
| LRE-8 |
9.375 |
9.375 |
25 |
25 |
| LRE-7 |
8.333 |
8.333 |
19 |
19 |
| LRE-15-5 |
16.667 |
6.250 |
31 |
13 |
| LRE-15-3 |
16.667 |
3.125 |
31 |
19 |
| LRE-15-1 |
16.667 |
1.563 |
31 |
13 |
| LRE-4 |
4.167 |
4.167 |
13 |
13 |
| LRE-3 |
3.125 |
3.125 |
13 |
13 |
| LRE-2 |
2.083 |
2.083 |
13 |
13 |
| LRE-4-1 |
4.167 |
1.563 |
19 |
13 |
| LRE-4-1LL |
4.167 |
1.563 |
19 |
13 |
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