Cisco Systems Cisco uBR10012 Ethernet and Fast Ethernet Connections, Fiber-Optic Connections

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 2-2shows the maximum transmission distances between stations for Ethernet and Fast Ethernet connections.

Table 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)

Fiber-Optic Connections

The specifications for single-mode, fiber-optic transmissions are outlined in Table 2-3.

Table 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)

Caution Do not exceed the specified distance limits.

Cisco uBR10012 Universal Broadband Router Hardware Installation Guide

OL-18259-01 2-9