3Com 5104M-FL1 BASE-FL Module Optical Power Budget, DBm, ONline to

Note: The values in Table 2-3 are peak power values. You determine average optical power by subtracting 3 dBm from the peak value. All of the examples provided in the pages that follow refer to peak optical power. Note that higher optical power is represented by a smaller negative number (for example, -12 dBm is greater than -20 dBm).

Table 2-3. 10BASE-FL Module Optical Power Budget

Cable Size	Transmit	Receive	Optical	Link Loss
	Power	Power	Power	Required
Used
	(dBm)	Range	Budget	(dB)
(microns)
	(Peak)	(dBm) (Peak)	(dB)	(ONline to
				ONline)
50/125	-16.5 ± 3.0	-8.0 to -29.5	10.0	None
NA 0.20
62.5/125	-12.0 ± 3.0	-8.0 to -29.5	14.5	None
NA 0.275
85/125	-9.0 ± 3.0	-8.0 to -29.5	17.5	>2.0 dB
NA 0.29
100/140	-6.5 ± 3.0	-8.0 to -29.5	20.0	>4.5 dB
NA 0.29

Attenuation

It is possible for receivers to receive too much light when:

❑Using 85/125 and 100/140 micron fiber cables

❑Ports are close together on a link

2 - 8 ONline Ethernet 10BASE-FL Installation and Operation Guide