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Cisco 6015 Manuel de référence rapide
Chapter 7
Broadband and Dial Access Products
Cisco Long Reach Ethernet Solution
The Cisco Long-Reach Ethernet (LRE) networking
solution delivers cost-effective, high-performance
broadband access to multitenant/dwelling units
(MxU) such as hotels, residential units, multitenant office buildings, shopping malls;
and enterprise campus environments such as manufacturing, educational campuses,
and medical facilities. Cisco LRE technology dramatically extends Ethernet over
existing Category 1/2/3 wiring at speeds from 5 to 15 Mbps (full duplex) and distances
up to 5,000 feet. This technology delivers broadband service over the same lines as
standard telephone (POTS), digital telephone, and ISDN circuits. In addition, Cisco
LRE supports modes compatible with asymmetric digital subscriber line (ADSL),
allowing service providers to provision LRE to buildings where broadband services
already exist. This solution also provides multicast, Layer 2 quality of service (QoS),
security, and Web-based Cisco Switch Clustering network management.
The Cisco LRE solution includes Cisco Catalyst 2900 LRE XL switches, the Cisco 575
LRE Customer Premise Equipment (CPE) device, and the Cisco LRE 48 POTS Splitter.
Catalyst 2900 LRE XL Desktop Switches
Cisco Catalyst 2900 LRE XL switches are based on the Cisco market-leading Catalyst
2900 Series XL 3.2-Gbps switch architecture, and include all Enterprise-class features
available in Catalyst 2900 XL switches. Now, service providers can address a broad
range of wiring environments beyond Category 5 cabling. This gives users a low-cost,
end-to-end solution and eliminates costly training.
The Catalyst 2900 LRE XL switches are one rack-unit (1RU) high, 13-inches deep, and
can be either mounted on a wall or placed on a rack. The switches deliver dedicated
bandwidth per port at rates up to 15 Mbps. LRE transmissions coexist with POTS and
ISDN, and can be compatible with ADSL traffic in the same building. The switches can
be configured on a per-switch basis to support the following modes:
• 5 Mbps symmetrical rate (up to 5,000-feet distance)
• 10 Mbps symmetrical rate (up to 4,000 feet)
• 15 Mbps symmetrical rate (up to 3,500 feet)
The Catalyst 2900 LRE XL switches provide fast and easy connectivity into building
patch panels with one RJ-21 telco connector. The 10/100 Ethernet ports can be used to
connect servers, daisy-chain multiple LRE switches, or uplink to a Cisco Catalyst 3500
XL, 2900 XL, or 2948G-L3 10/100 Ethernet switch. These connectivity options
provide multiple price/performance options to meet building and budget requirements.
Cisco 575 LRE CPE Device
Each LRE port is terminated in the room with the Cisco 575 LRE Customer Premise
Equipment (CPE) device. This compact device bridges LRE and Ethernet, and provides
one RJ-45 Ethernet connection and two RJ-11 connectors—one for the wall and one for
a telephone. The Cisco 575 LRE CPE device can be mounted on or under a desk, or on
a wall. It ships with a mount lock-in mechanism and clip-on Ethernet cable guard to
discourage theft, as well as an Ethernet cord. It supports voice (Plain Old Telephone
Service—POTS) traffic-including ISDN or digital phones-that coexists over the same
LRE line by splitting LRE and POTS traffic at the CPE device. A POTS Splitter is
required for connectivity to the PBX and LRE switch stack.
Cisco Long Reach Ethernet Solution
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