Allied Telesis AT-SB4008 2.0dB for single-mode, SWITCHBLADE 4000 Layer 3 Modular Switch, 1300

SWITCHBLADE® 4000 Layer 3 Modular Switch

Power Outputs for Optical Ports

Card	Wave Length	Fibre Type	Transmitter	Receiver	dBm loss allowed	Minimum distance	Received Power
			dBm Min	Sensitivity Max	Max. 1	using IEEE 802.3	Max. dBm avg.4
				dBm		fibre attenuation
				(of same card)		(Km)2 3
AT-SB4352	1310nm	50.0um	-20	-31	6	4.0	-14
32 port (MT-RJ)
AT-SB4352	1310nm	62.5um	-23.5	-31	2.5	1.7	-14
32 port (MT-RJ)

Maximum fibre attenuation per km from IEEE 802.3 Table 38-12

Description	62.5um MMF		50um MMF		10um SMF Unit
Nominal fibre specification wavelength (nM)	850	1300	850	1300	1310
Fibre cable attenuation (max) (dB/km)1	3.75	1.5	3.5	1.5	0.5

1	dBm loss allowed Max = Transmitter dBm min avg. - Receiver sensitivity max avg. - (2 x 1dBm per connector) - 3dBm buffer
2	Minimum distance using IEEE 802.3 fibre attenuation = dBm loss allowed max / Fibre cable attenuation (max)
3	Note, when calculating the actual distance the attenuation of the fibre optical cable,	and all attenuators, must	be used.	Measurements may be required to determine this attenuation.
4	Max power received before transceiver stops receiving correctly.
5	Maximum distances calculated based on an allocation of 1.5dB total connections and	splice loss for multi-mode	fibre and	2.0dB for single-mode.

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