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

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