Nortel Networks 450 - Manual (Page 243)

Gigabit Fiber Optical Characteristics
302401-D Rev 00 B-3
Receive Characteristics
Table B-3 lists the receive characteristics for the 1000BASE-SX models:
Worst-Case Power Budget and Penalties
Table B-4 lists the worst-case power budget and penalties for the 1000BASE-SX
models:
Table B-3. 1000BASE-SX Receive Characteristics
Description
62.5 Micron
Multimode Fiber 50 Micron
Multimode Fiber
Units
Signaling Speed (range) 1.25 ± 100 ppm 1.25 ± 100 ppm GBd
Wavelength (range) 770 to 860 770 to 860 nm
Average receive power (maximum) 0 0 dBm
Receive sensitivity – 17 – 17 dBm
Return loss (minimum) 12 12 dB
Stressed receive sensitivity 1 , 2
1 Measured with conformance test signal at TP3 for BER = 10 –12 at the eye center.
2 Measured with a transmit signal having a 9 dB extinction ratio. If you use another extinction ratio, correct the stressed
receive sensitivity according to the extinction ratio penalty.
– 12.5 – 13.5 dBm
Receive electrical 3 dB upper cutoff frequency
(maximum) 1500 1500 MHz
Vertical eye-closure penalty 3
3 Vertical eye-closure penalty is a test condition for measuring stressed receive sensitivity. It is not a required
characteristic of the receiver.
2.60 2.20 dB
Note: The link power penalties ( Table B-4 ) are used for link power budget
calculations only. They are not requirements and are not meant to be tested.
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