Nortel Networks 450 manual Receive Characteristics, Worst-Case Power Budget and Penalties

Gigabit Fiber Optical Characteristics

Receive Characteristics

Table B-3 lists the receive characteristics for the 1000BASE-SX models:

Table B-3.	1000BASE-SX Receive Characteristics
		62.5 Micron	50 Micron
Description		Multimode Fiber	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		– 12.5	– 13.5	dBm
Receive electrical 3 dB upper cutoff frequency		1500	1500	MHz
(maximum)
Vertical eye-closure penalty 3		2.60	2.20	dB

1 Measured with conformance test signal at TP3 for BER = 10–12at 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.

3Vertical eye-closure penalty is a test condition for measuring stressed receive sensitivity. It is not a required characteristic of the receiver.

Worst-Case Power Budget and Penalties

Table B-4 lists the worst-case power budget and penalties for the 1000BASE-SX models:

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.

302401-D Rev 00 B-3