Cisco 2950G 24 Software Configuration Guide - Page 52

Network Configuration Examples Chapter 1 Overview Long-Distance, High-Bandwidth Transport Configuration Note To use the feature described in this section, you must have the EI installed on your Catalyst 2950 switch. This feature does not apply to the Catalyst 2950 LRE switches. Figure 1-7 shows a configuration for transporting Gigabits of data from one location to an off-site backup facility over a single fiber-optic cable. The Catalyst switches have Coarse Wave Division Multiplexer (CWDM) fiber-optic GBIC modules installed. The CWDM GBIC modules can connect to distances of up to 393,701 feet (74.5 miles or 120 kilometers). Depending on the CWDM GBIC module, data is sent at wavelengths from 1470 to 1610 nanometers (nm). The higher the wavelength, the farther the transmission can travel. A common wavelength for long-distance transmissions is 1550 nm. Up to eight CWDM GBIC modules, with any combination of wavelengths, can connect to a Cisco CWDM Passive Optical System. It combines (or multiplexes) the different CWDM wavelengths, allowing them to travel simultaneously on the same fiber-optic cable. The Cisco CWDM Passive Optical System on the receiving end separates (or demultiplexes) the different wavelengths. Using CWDM technology with the switches translates to farther data transmission and an increased bandwidth capacity (up to 8 Gbps) on a single fiber-optic cable. For more information about the CWDM GBIC modules and CWDM Passive Optical System, refer to the CWDM Passive Optical System Installation Note. Figure 1-7 Long-Distance, High-Bandwidth Transport Configuration 74089 8 Gbps CWDM OADM modules Eight 1-Gbps connections Catalyst 2900 XL, Catalyst 2950, Catalyst 3500 XL, and Catalyst 3550 switches Access layer CWDM OADM modules Catalyst 4000 multilayer switches Aggregation layer 1-20 Catalyst 2950 Desktop Switch Software Configuration Guide 78-14982-01