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12-3
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 12 Configuring LRE
Understanding LRE Features
Note Use the rates and distances in Table 12-1 and Table 12-2 only as guidelines. Factors such as the type of
cable that you use, how it is bundled, and the interference and noise on the LRE link can affect the actual
LRE link performance. Contact Cisco Systems for information about limitations and optimization of
LRE link performance. The downstream and upstream rates in the table are slightly less than the gross
data rates shown by the show controllers lre profile names privileged EXEC command output.
Ta b l e 12-1 LRE Profiles for the Catalyst 2950ST-8 LRE and the 2950ST-24 LRE Switches
Profile Name
LRE Link
Downstream
Rate (Mbps)
LRE Link Upstream Rate
(Mbps)
Theoretical
Minimum SNR
Downstream
Theoretical
Minimum SNR
Upstream
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-4-1-LL 4.167 1.563 19 13
Ta b l e 12-2 LRE Profiles for the Catalyst 2950ST-24 LRE 997 Switches
Profile Name
LRE Link
Downstream
Rate (Mbps)
LRE Link Upstream Rate
(Mbps)
Theoretical Minimum
SNR Downstream
Theoretical
Minimum SNR
Upstream
LRE-12-9 12.500 9.375 31 25
LRE-12-3 12.500 3.125 31 13
LRE-9 9.375 9.375 25 25