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Anleitung Zusammenfassung
length Wavelength Multi-mode fiber 50/125, 62.5/125. 2km 850 nm www GarrettCom com . . 32 Magnum “14” 10Mb Media Converters Installation and User Guide ( 04/ 01) Fiber Cable Type cable diameter * Max. length Wavelength Single-mode fiber 2/15 - 8/60 10km 1300 nm * xx/ yy are the diameters of the core and the core plus cladding respectively The values shown are typical values Procedure for connecting multi- mode and single-mode fiber cables: 1. Before connecting the fiber cable, remove the protective dust caps from the tips of the connectors on the media converter. Save these dust caps for future use. 2. Wipe clean the ends of the dual connectors with a soft cloth or lint- free lens tissue dampened in alcohol. Make certain the connectors are clean before connecting. Note: One strand of the duplex fiber optic cable is coded using color bands at regular intervals; you must use the color- coded strand on the associated ports at each end of the fiber optic segment. 3. Connect the Transmit ( TX) port ( light colored post) on the Magnum Media Converter to the Receive ( RX) port of the remote device. Begin with the color- coded strand of the cable for this first TX-to-RX connection. 4. Connect the Receive ( RX) port ( dark- colored post) on the product to the Transmit (TX) port of the remote device. Use the non- color coded fiber strand for this. 5. The LINK LED corresponding to the fiber port on the front of the product will illuminate (for standard non- Link- Pass- through models) when a proper connection has been established at both ends ( and when power is ON in the units at each end) . If LINK is not lit www GarrettCom com . . 33 Magnum “14” 10Mb Media Converters Installation and User Guide ( 04/ 01) after cable connection, the normal cause is improper cable polarity. Swap the fiber cables on the product connector to remedy this situation. 6. For the Link Pass- through model, connection is the same except that the LINK indication will not be present unless LINK is made for the cables on both sides. 3.6.3 Power Budget Calculations for Fiber Media Magnum TF14 Receiver Sensitivity and Transmitter Power are the parameters necessary to compute the power budget. To calculate the power budget of different fiber media installations, the following equations should be used: OPB (Optical Power Budget) = PT(min) - PR(min) where PT = Transmitter Output Power, and PR = Receiver Sensitivity Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss) Worst case distance = {Worst case OPB, in dB} / [ Cable Loss, in dB/Km] where the “ Cable Loss” for 62.5/125 and 50/125.m ( M.m) is 2.8 dB/km, and the “ Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km, and the “ Cable Loss” for 9/125 ( Single-mode) is 0.5 dB/km www GarrettCom com . . 34 Magnum “14” 10Mb Media Converters Installation and User Guide ( 04/ 01) The following data has been collected from component manufacturer’s ( HP’s and Siemens’) web sites and catalogs to provide guidance to network designers and installers. Fiber Port Module Speed, Std. Mode Std. km fdx (hdx) Wave - length nm Cable Size µ .... m X’mitr Output PT , dB R’cvr Sens. PR , dB Worst OPB, dB Worst* distance Km, fdx typical OPB, dB typical* distance Km, fdx FPM10MST, MSC 10 Mb FL Multi- mode 2 (2) 850 62.5/125 100/140 50/125 - 15.0 -9.5 - 19.5 -31 -31 -31 14 19.5 9.5 5 5.9 3.4 17 23.5 13.5 6 7 4.8 FPM10SST, SSC 10 Mb FL Single- mode 10 (5) 1300 9/125 -30 - 39 7 14 13 26 3.6.4 Connecting ThinNet 10BASE2 Connect the ThinNet coax cable to the BNC connector on the TB14 Media Converter in the same manner as is done for any standard BNC connection. Be sure that www GarrettCom com. . the BNC segment is properly terminated using a standard “ T” connector and terminator. 35 Magnum “14” 10Mb Media Converters Installation and User Guide ( 04/ 01) 4.0 OPERATION This section describes the operation of the Magnum TF14 and TB14 10Mb Media Converters, including power supply requirements, up-link switch functionality, and a description of all LEDs. 4.1 Power Requirements, Power Supply Types for TF14 vs. TB14 Magnum TF14 Media Converters are very power-efficient. They only require about 2 watts of power and are designed to be used with a tiny external 9- volt power supply. This power supply is different from other power supplies used with any other Magnum products, including even the companion TB14 unit. Magnum TB14 Media Converters require 12v internal for the BNC port.. They typically use about 5 watts of power and are designed to be used with an external 12- volt power supply. This power supply is the same as the power supplies used with several other Magnum products, including 10Mb Magnum Personal Hubs and the TF14 and TB14 models of 10Mb Magnum Media Converters. 4.2 Front Panel LEDs - Magnum TF14, TF14s, and TF14- LP fiber models LED Description www GarrettCom com . . 36 Magnum “14” 10Mb Media Converters Installation and User Guide ( 04/ 01) PWR Illuminates GREEN to indicate the unit is receiving DC power. LIN...