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1 © 2000, Cisco Systems, Inc. 1 Long Reach Ethernet - LRE
2 © 2000, Cisco Systems, Inc. 2 Challenges to Overcome Overcome Ethernet distance limitation More bandwidth over Category 1/2/3 support advanced media-rich applications Drive down per-line costs while driving up performance by utilizing Ethernet components Retain key QoS, security, provisioning and management features Ensure equipment is easy to use and provides platform for future applications
3 © 2000, Cisco Systems, Inc. 3 Technology Solution: LRE (Ethernet Over VDSL) 5, 10 or 15 Mbps symmetric throughput Maps directly to full duplex Ethernet Allows for true high speed BANs Co-exists with POTS and digital phones Requires splitter Up to 5000 ft over single pair Cat 3 Runs over Cat 1, 2 as well unstructured wiring Based on robust Catalyst switching platform
4 © 2000, Cisco Systems, Inc. 4 Solution Components Catalyst 2924-LRE-XL Switch Cisco 575-LRE CPE PS-1M-LRE-48 POTS Splitter 10/100 L2 or L3 Ethernet switch: Stack aggregator Cisco Building Broadband Service Manager (Radius Authentication, NAT, DHCP, DNS, User Self-Activation, Dynamic Bandwidth Selection), Third-party Account/Billing
5 © 2000, Cisco Systems, Inc. 5 Catalyst 2900-LRE-XL Based on industry leading Catalyst 2900-XL platform IOS Based 802.1Q VLANs 802.1p COS Management CLI Embedded web console CPE Monitoring Switch Clustering Security Private VLAN Access (unicasts to uplink port only) Multicast control TACACS+ (management authentication) 12 or 24 LRE Ports (RJ21) 4 10/100 Ethernet Ports (RJ45) For stacking or connection to router or server 1 RU High
6 © 2000, Cisco Systems, Inc. 6 Cisco 575-LRE CPE Converts VDSL to standard Ethernet Integral POTS splitter for telephone attach Passive function 2 RJ11s for Line input and telephone Supports 2-line phones 1 RJ45 for Ethernet Monitoring remotely from switch using web interface or CLI
7 © 2000, Cisco Systems, Inc. 7 PS-1M-LRE-48 POTS Splitter Non-homologated version Supports 48 ports No power supply - Passive device 1 RU High ADC & Corning to provide homologated splitter Requires specific splitter
8 © 2000, Cisco Systems, Inc. 8 LRE Overview Add-on as Needed Main Closet PBX POTS Splitters LRE Switches Internet Router Management Gateway Floor 1 Floor 2 Floor 3 Floor 4 Floor 5 Up to 4000’
9 © 2000, Cisco Systems, Inc. 9 LRE Room Detail Main Closet PBX POTS Splitter LRE Switch Internet Router Management Gateway Guest RoomPC Connection Up to 4000’ Existing Phone Wiring
10 © 2000, Cisco Systems, Inc. 10 LRE EQUIPMENT LAYOUT
11 © 2000, Cisco Systems, Inc. 11 LRE EQUIPMENT LAYOUT
12 © 2000, Cisco Systems, Inc. 12 LRE Technology Overview Enables the use of Ethernet over existing, unconditioned, telephone-grade wire Enables Ethernet to coexist with “plain old telephone service” (POTS), Integrated Services Digital Network (ISDN) or private branch exchange (PBX) signaling services Uses DSL coding and digital modulation techniques with Ethernet Provides a point-to-point transmission that can deliver a symmetrical, full duplex, data rate of up to 15 Mbps LRE products are simple to install and interface with any existing Ethernet solution
13 © 2000, Cisco Systems, Inc. 13 LRE Technology—Bandwidth LRE technology can operate at up to 17 Mbps Enables transport of Ethernet data up to 15 Mbps Transport overhead does not reduce the Ethernet bandwidth
14 © 2000, Cisco Systems, Inc. 14 Standard xDSL Frequency Bands Downstream kHz 3.75 MHz 12 MHz5.2 MHz 8.5 MHz Upstream-1 Downstream-2 Upstream-2 Upstream and downstream transmissions separated by frequency (FDD) 4 bands gives more flexibility for performance vs reach
15 © 2000, Cisco Systems, Inc. 15 LRE Frequency Bands Downstream TX - Switch RX - CPE Upstream RX - Switch TX - CPE 900 KHz3.75 MHz9 MHz5.2 MHz Downstream band reduced to allow use of digital “SmartPhones” Upstream band may use standard frequencies or may use wider band for “private” installations Maximum data rates 15Mb/s full duplex (private) or 15/5 for standard installations
16 © 2000, Cisco Systems, Inc. 16 Summary of LRE Key Technology Features Standard 10 Mbps Ethernet over regular twisted pair copper wire Distances of up to 4000 ft (1.2 km) at full-duplex 10 Mbps, 15 Mbps high-speed mode (3500 ft, 1 km) Simultaneous data and POTS, ISDN or PBX signaling services over the same line Utilizes the most advanced multi-QAM modulation techniques Minimum interference with other wire pairs and other services Full-duplex point-to-point transmission Longer distances can be reached at lower rates Low power-implementation, minimum heat-dissipation issues Supports testing and management capabilities
17 © 2000, Cisco Systems, Inc. 17 Design Examples
18 © 2000, Cisco Systems, Inc. 18 Broadband Ethernet Solution Hotel Telecommuter Design Cisco 1700/2600 POTS Splitter CPE Catalyst 2924-LRE Catalyst 2900 XL LRE Room 1 CPE Room 2 Catalyst 2900 XL - Local services/intranet - Video Servers Conference Room Aironet 340 Long Reach Ethernet Internet/ VPN PSTN Network PBX Cache Engine (Optional) POTS Phone LRE LRE BBSM Accounting/Billing/Security
19 © 2000, Cisco Systems, Inc. 19 Cisco 1700 Cisco 1700 POTS Splitter Multi Dwelling Unit Gigabit to the Central Office Catalyst 2924-LRE LRE LRE Catalyst 6500 GSR Central Office Catalyst 3512 XL Telecommuter Aironet CPE Apartment Telecommuter CPE Apartment Aironet VPN LRE LRE LRE LRE CPE PSTN Network
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