3Com 3CB9LF20R Installation Guide - Page 2

2 70-km Gigabit Ethernet GBIC Transceiver Installation Guide Table 1 shows the transmission range and other data for this connection. Table 1 70-km Gigabit Ethernet GBIC Single-Mode Transmission Range Fiber Type Single-mode Diameter (microns) 9µm core Minimum Connector End Polish PC Transmission Range 10 - 70 km (6.2 - 43.4 mi) Table 2 shows the optical parameters of the 70-km Gigabit Ethernet GBIC. Table 2 Optical Parameters Parameter Transmitter Symbol Min Wavelength λc 1540 Optical output Pout -4 power Receiver Typ 1550 N/A Max 1570 N/A Units nm dBm Notes/Conditions Average power coupled into single-mode fiber Optical input power Pin -24 N/A N/A dBm BER< 10-12 with PRBS 27 -1 test data pattern @ 1.25Gb/s Safety Precautions Be sure to follow all safety precautions when you replace a GBIC transceiver in the system. To avoid electric shocks and burns to yourself and damage to the equipment, read and follow these warnings: WARNINGS: When the system is on: s Never insert a metal object such as a screwdriver or a finger with jewelry into open module slots. s Do not touch any connections inside the chassis with your hands or fingers. Fiber Safety Precautions The GBIC ports on your system use lasers. To ensure your safety when you install or work with these GBIC systems, read and comply with the precautions in this section.