Using the BayStack 450 10/100/1000 Series SwitchB-2 302401-D Rev 00Transmit CharacteristicsTable B-2 lists the transmit characteristics for the 1000BASE-SX models:Table B-2. 1000BASE-SX Transmit CharacteristicsDescription62.5 MicronMultimode Fiber50 MicronMultimode Fiber UnitsTransmitter type Shortwave Laser Shortwave LaserSignaling speed 1.25 ± 100 ppm 1.25 ± 100 ppm GBdWavelength (l, range) 770 to 860 770 to 860 nmT rise/T fall (maximum; 20% - 80%; > 830 nm) 0.26 0.26 nsT rise/T fall (maximum; 20% - 80%; < = 830 nm) 0.21 0.21 nsRMS spectral width (maximum) 0.85 0.85 nmAverage launch power (maximum) 11 The 1000BASE-SX launch power shall be the lesser of the class 1 safety limit, as defined by the IEEE 802.3z standard,Clause 38.7.2, or the average receive power (maximum), as defined in Table B-3.See footnote 1 See footnote 1 dBmAverage launch power (minimum) – 9.5 – 9.5 dBmAverage launch power of OFF transmitter(maximum) 22 Examples of an OFF transmitter are: no power supplied to the PMD, laser shutdown for safety conditions, activation of a“transmit disable” or other optional laser shutdown conditions. During all conditions when the PMA is powered, the ACsignal (data) into the transmit port will be valid encoded 8B/10B patterns (this is a requirement of the PCS layers),except for short durations during system power-on-reset or diagnostics when the PMA is placed in a loopback mode.– 30 – 30 dBmExtinction ratio (minimum) 9 9 dBRIN (maximum) – 117 – 117 dB/HzCoupled Power Ratio (CPR) minimum 33 Avoid radial overfilled launches even if the launch parameters are within the CPR range.9 < CPR 9 < CPR dbkombk.book Page 2 Tuesday, June 29, 1999 3:25 PM
