Cisco Systems CISCO7201 manual Connecting Native Gigabit Ethernet Cables

Chapter 2 Installing the Cisco 7201 Router

Connecting I/O Cables

When in a fixed-speed configuration and MDI mode:

•Use a crossover cable to connect to an MDI port

•Use a straight-through cable to connect to an MDI-X port

Connecting Native Gigabit Ethernet Cables

The Cisco 7201 router has four native Gigabit Ethernet interfaces and six physical Gigabit Ethernet ports, four SFP ports (optical) and two RJ-45 ports (copper). The use of an RJ-45 port or SFP port on a common Gigabit Ethernet interface is mutually exclusive at any one time.

Gigabit Ethernet SFP Connection Equipment

The SFP port is a 1000-Mbps optical interface in the form of an LC-type duplex port that supports IEEE 802.3z interfaces compliant with the 1000BASEX standard. (See Figure 2-16.)

Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. Statement 70

Figure 2-14shows the Class 1 warning label that appears on the Gigabit Ethernet optical ports.

Figure 2-14 Laser Class 1 Warning Label

CLASS 1 LASER PRODUCT LASERPRODUKT DER KLASSE 1

PRODUIT LASER DE CLASSE 1

PRODUCTO LASER CLASE 1

11772

Figure 2-16shows the duplex LC-type connectors on your multimode or single-mode optical fiber cables. For simplex connectors, two cables are required, one cable for transmit (TX) and a second cable for receive (RX). For duplex connectors, only one cable that has both TX and RX connectors is required. You can use either simplex or duplex connectors to the SFP ports on the Cisco 7201 router.

Appendix A, “Specifications,” provides cabling specifications and configuration information for the SFP modules that you install in the Gigabit Ethernet SFP ports.

The following SFP modules are supported on the Cisco 7201:

•100BASE-FX SFP—The SFP-GE-F=,100BASE-FX SFP module is a hot-swappable device that plugs into a Gigabit Ethernet SFP port. It provides full-duplex 100-Mbps connectivity over multimode fiber (MMF) infrastructures. The 100BASE-FX SFP operates on ordinary MMF optical link spans of up to 2 kilometers (km) in length.

•1000BASE-LH/LX SFP module—The SFP-GE-L= (1000BASE-LH/LX SFP module) operates on ordinary single-mode fiber-optic link spans of up to 32,808 feet (10,000 meters) in length.

•1000BASE-SX SFP module—The SFP-GE-S= (1000BASE-SX SFP module) operates on ordinary multimode fiber-optic link spans of up to 1804 feet (550 meters) in length.

1000BASE-ZX SFP module—The SFP-GE-Z= (1000BASE-ZX SFP module) operates on ordinary single-mode fiber-optic link spans of up to 43 miles (70 kilometers) in length. Link spans of up to 100 km are possible using premium single-mode fiber or dispersion-shifted single-mode fiber. The SFP module provides an optical link budget of 23 dB—the precise link span length depends on multiple factors, such as fiber quality, number of splices, and connectors.

	Cisco 7201 Installation and Configuration Guide
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