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Chapter 7
Configuring the Switch Ports
Types of LRE Profiles
The LRE switches are shipped with predefined profiles
and private (per-port) mode profiles. By default, all LRE ports on the switch are enabled with the
LRE-10 private profile. This default profile allows the upstream and downstream transmission rate on
the LRE link to be 10 Mbps.
•
Note
Note
•
Note
Use the rates and distances in
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 net data rates in the table are slightly less than the gross data rates displayed by the
show controllers lre profile names privileged EXEC command. The actual bandwidth is somewhat
less.
Table 7-1
LRE Profiles
Profile Name
Profile Type
PUBLIC-ANSI
Public
PUBLIC-ETSI
Public
LRE-5
Private
LRE-10 (default)
Private
LRE-15
Private
LRE-10-1
Private
LRE-10-3
Private
78-6511-08
Public—We strongly recommend using a public profile if the switch is used with equipment directly
connected to a Public Switched Telephone Network (PSTN) without a private branch exchange (PBX)
between the LRE switch and the public telephone lines. When the switch is configured with a public
profile, all LRE ports use the same configuration to prevent the switch from causing interference
with the other lines on the PSTN.
Consult the regulations for connecting to the PSTN in your area.
Cisco LRE products can share lines with analog telephones, Integrated Services Digital Network
(ISDN), and digital PBX switch telephones that use the 0 to 700 kHz frequency range.
The standards for spectral profiles have not yet been ratified. The PUBLIC-ANSI profile
corresponds to ANSI Plan 998. The PUBLIC-ETSI profile corresponds to ETSI Plan 997. Both
plans are draft standards. Contact Cisco Systems for the latest information about standards
ratification or for updates to the public profiles.
Private—You can use a private profile if the LRE switch is not used with equipment connected to a
PSTN. The switch supports a variety of private profiles that offer different link speeds and
maximum distances. In general, the higher the link speed, the shorter the maximum distance. Private
profiles are assigned on a per-port basis. The ports on an LRE switch can be assigned the same or
different private profiles.
LRE Link
Downstream Rate (Mbps)
15.17
11.38
5.69
11.38
15.17
11.38
11.38
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
(Table
Table 7-1
as guidelines only. Factors such as the type of cable that you
LRE Link
Upstream Rate (Mbps)
4.27
4.27
5.69
11.38
17.06
1.43
2.87
Configuring the LRE Ports
7-1) categorized as public (global) mode
Maximum Distance between
the LRE Switch and LRE CPE
4101 ft (1250 m)
4101 ft (1250 m)
4921 ft (1500 m)
4101 ft (1250 m)
3445 ft (1050 m)
4101 ft (1250 m)
4101 ft (1250 m)
7-17
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