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10-3
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 10 Configuring LRE
LRE Links and LRE Profiles
Your data rates will always be less than the gross data rate listed in table. A small percentage of the link
rate is used by 2950 LRE switch for supervisory functions with the CPE device connected remotely.
In general, profiles are named for the data rate that you expect to achieve and not the gross data rate as
given in the table. All system-defined profiles have the prefix LRE, followed by the downstream user
data rate and then the upstream user data rate. If the profile is symmetric, only one data rate is given.
The two profiles defined to comply with public frequency usage plans 998 and 997 (LRE-998-15-4 and
LRE-997-10-4) are exceptions to this. These two uniquely named profiles work in any private
deployment.
• If you are not using sequences and you have not assigned a profile to an LRE port, the port has a
default value of LRE-10. Port profiles have priority over global profiles. If you assign a global
profile to the switch, the switch uses the global profile except on any LRE ports on which a specific
profile was assigned.
When you assign a different profile to a switch LRE port, the port immediately resets and uses the
newly assigned profile.
Table 10-1 LRE Profiles
Profile Name
LRE Link
Downstream Rate
(Mbps)
LRE Link
Upstream Rate
(Mbps)
Theoretical
Min SNR
Downstream
Theoretical
Min 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-4-1LL 4.167 1.563 19 13