Universal Broadband Router Hardware Installation Guide

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Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
OL-18259-01
Chapter 2 Preparing for Installation
Site Requirements
• Distance limitations for each signal type
• The specific cables you need to connect each interface
• Any additional interface equipment you need, such as transceivers, hubs, switches, modems,
channel service units (CSUs), or data service units (DSUs)
The extent of your network and the distances between network interface connections depend in part on
the following factors:
• Signal type
• Signal speed
• Transmission medium
The distance and rate limits referenced in the following sections are the IEEE-recommended maximum
speeds and distances for signaling purposes. Use this information as a guideline in planning your
network connections prior to installing the Cisco
uBR10012 router.
Ethernet and Fast Ethernet Connections
The maximum distances for Ethernet and Fast Ethernet network segments and connections depend on
the type of transmission cable being used. The terms 10Base-T and 100Base-T are industry shorthand
nomenclature for the following:
• 10 Mbps transmission rate (10), or 100 Mbps transmission rate (100)
• Using baseband technology (Base)
• By means of twisted pair wires (T)
Table 2-2 shows the maximum transmission distances between stations for Ethernet and Fast Ethernet
connections.
Fiber-Optic Connections
The specifications for single-mode, fiber-optic transmissions are outlined in Table 2-3.
Caution Do not exceed the specified distance limits.
Ta b l e 2-2 Ethernet and Fast Ethernet Maximum Transmission Distances
Transceiver Speed Cable Type Transmission Mode Maximum Distance between Stations
10 Mbps Category 3 Full and half duplex 328 ft (100 m)
100 Mbps Category 5 Full and half duplex 328 ft (100 m)
Ta b l e 2-3 Fiber-Optic Transmission Characteristics
Characteristic Permissible Value Characteristic Permissible Value
Transmitter output power –15 to –8 dBm Wavelength 1261 to 1360 nm
Receiver sensitivity –28 to –8 dBm Maximum span 9 miles (14.5 km)