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Product Overview

The Cisco Catalyst

2950 LRE switches are ﬁxed-conﬁguration, stackable models that provide wire-speed LRE and

Gigabit Ethernet connectivity for small and midsized networks. The Catalyst 2950 Series is an affordable product line

that brings intelligent services, such as enhanced security, high availability and advanced quality of service (QoS), to

the network edge—while maintaining the simplicity of traditional LAN switching. When a Catalyst 2950 LRE switch

is combined with a Catalyst 3550 Series switch, the solution can enable IP routing from the edge to the core of the

network. Embedded in Catalyst 2950 Series switches is the Cisco Cluster Management Suite (CMS) Software, which

allows users to simultaneously conﬁgure and troubleshoot multiple Catalyst desktop switches using a standard Web

browser. In addition to CMS, Cisco Catalyst 2950 LRE switches provide extensive management tools using Simple

Network Management Protocol (SNMP) network management platforms such as CiscoWorks for Switched

Internetworks.

The Cisco 2950 LRE solution includes the Cisco Catalyst

Premise Equipment (CPE) devices, and the Cisco LRE POTS Splitter. Each LRE link is terminated with either the Cisco

575 or 585 LRE CPEs, and a POTS splitter is required when POTS trafﬁc coexists with the LRE link over the same

line.

The Cisco Catalyst 2950 LRE switches consist of the following devices—which are based upon the Enhanced Image

(EI) Software for the Catalyst 2950 Series.

• Catalyst 2950ST-24-LRE— 24 LRE ports + 2 10/100/1000BASE-T ports + 2 Small Form-Factor Pluggable (SFP)

ports (two of the four uplinks active at one time)

• Catalyst 2950ST-8-LRE— 8 LRE ports + 2 10/100/1000BASE-T ports + 2 SFP ports (two of the four uplinks active

at one time)

The two built-in Gigabit Ethernet SFP ports support 1000BASE-SX and 1000BASE-LX modules. The dual SFP-based

and copper Gigabit Ethernet implementation provides customers with tremendous deployment ﬂexibility—allowing

customers increased availability with the redundant uplinks. High levels of stack resiliency can also be implemented

by deploying dual redundant Gigabit Ethernet uplinks and UplinkFast technologies for high-speed uplink and stack

interconnection failover, and Per VLAN Spanning Tree Plus (PVST+) for uplink load balancing.

The LRE technology employs Quadrature Amplitude Modulation (QAM). QAM modulation uses both signal

amplitude and phase to deﬁne each symbol. LRE uses the most sophisticated QAM technology with various

QAM modulations (QAM-256, QAM-128, QAM-64, QAM-32, QAM-16, QAM-8, and QAM-4). The system

administrator may choose proﬁles that use different modulations and frequency plans according to the line

speciﬁcation and rate deﬁnition. LRE is designed to support multiQAM in order to achieve performance as close

to the physical limit as possible, while maintaining low cost and low power.

Cisco LRE facilitates the transport of symmetrical, bi-directional data over unshielded, copper twisted-pair telephone

wires originally intended for the frequency band between 300 Hz and 3.4 KHz. The system employs Frequency

Division Duplexing (FDD) to separate the downstream channel, the upstream channel, and POTS, ISDN, or PBX

signaling services in the frequency domain. This enables service providers to overlay LRE on existing POTS, ISDN,

or analog PBX signaling services without disruption. Both LRE and POTS/ISDN/analog PBX services may be

transmitted over the same line without interfering with each other.

2950 LRE switches, the Cisco 575 and 585 LRE Customer

Cisco Systems, Inc.

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