Gigabit Fiber Optical Characteristics302401-D Rev 00 B-5Transmit CharacteristicsTable B-6 lists the transmit characteristics for the 1000BASE-LX models:Receive CharacteristicsTable B-7 lists the receive characteristics for the 1000BASE-LX models:Table B-6. 1000BASE-LX Transmit CharacteristicsDescription62.5 MicronMultimode Fiber50 MicronMultimode Fiber10 MicronSingle-ModeFiber UnitTransmitter type Longwave Laser Longwave Laser Longwave LaserSignaling speed (range) 1.25 ± 100 ppm 1.25 ± 100 ppm 1.25 ± 100 ppm GBdWavelength (range) 1270 to 1355 1270 to 1355 1270 to 1355 nmT rise /T fall(maximum 20-80% response time)0.26 0.26 0.26 nsRMS spectral width (maximum) 4 4 4 nmAverage launch power (maximum) – 3 – 3 – 3 dBmAverage launch power (minimum) – 11.5 – 11.5 – 11.0 dBmAverage launch power of OFFtransmitter (maximum)– 30 – 30 – 30 dBmExtinction ratio (minimum) 9 9 9 dBRIN (maximum) – 120 – 120 – 120 dB/HzCoupled Power Ratio (CPR)11 Due to the dual media (single-mode and multimode) support of the LX transmitter, fulfillment of this specification requiresa single-mode fiber offset-launch mode-conditioning patch cord described in IEEE 802.3, Clause 38.11.4 for MMFoperation. This patch cord is not used for single-mode operation.28 < CPR < 40 12 < CPR < 20 N/A dBTable B-7. 1000BASE-LX Receive CharacteristicsDescription Value UnitsSignaling speed (range) 1.25 ± 100 ppm GBdWavelength (range) 1270 to 1355 nmAverage receive power (maximum) – 3 dBm(continued)kombk.book Page 5 Tuesday, June 29, 1999 3:25 PM
