Nortel Networks 450 manual 1000BASE-LX Models, Micron Parameter Multimode Fiber Units

Using the BayStack 450 10/100/1000 Series Switch

Table B-4. Worst-Case 1000BASE-SX Power Budget and Penalties

	62.5 Micron		50 Micron
Parameter	Multimode Fiber		Multimode Fiber		Units
Modal bandwidth as measured at 850 nm	160	200	400	500	MHz · km
(minimum, overfilled launch)
Link power budget	7.5	7.5	7.5	7.5	dB
Operating distance	220	275	500	550	m
Channel insertion loss 1, 2	2.38	2.60	3.37	3.56	dB
Link power penalties	4.27	4.29	4.07	3.57	dB
Unallocated margin in link power budget	0.84	0.60	0.05	0.37	dB

1 Operating distances used to calculate the channel insertion loss are the maximum values specified in Table B-1 on page B-1.

2 A wavelength of 830 nm is used to calculate channel insertion loss, link power penalties, and unallocated margin.

1000BASE-LX Models

The 450-1LX and 450-1LR MDAs provide 1000BASE-LX (1300 nanometers, long wavelength, Gigabit Ethernet) connectivity. The 450-1LX provides one 1000BASE-LXport. The 450-1LR provides one 1000BASE-LX port and one LinkSafe redundant port.

Operating Range

Table B-5 lists the operating range for the 1000BASE-LX models:

Table B-5.	Operating Range for 1000BASE-LX
	Modal Bandwidth @ 1300 Nanometers with
Fiber Type	Minimum Overfilled Launch (MHz · km)	Minimum Range (Meters)
62.5 um MMF	500	2 to 550
50 um MMF	400	2 to 550
50 um MMF	500	2 to 550
10 um SMF	N/A	2 to 5000

B-4 302401-D Rev 00