Справочник Пользователя для Pelco FR85011
C1642M-A (1/05)
29
OPTICAL POWER BUDGET, TRANSMISSION DISTANCE, AND LASER CLASS 1 LIMIT
Fiber
Wavelength
Optical
Power
Budget
Maximum
Transmission
Distance
Laser
Class 1
Limit*
Multimode
1310 nm (video)
20 dB
†
6 km (3.7 mi)
‡
<15.6 mW
850 nm (data)
20 dB
†
6 km (3.7 mi)
‡
<0.78 mW
Single-mode
1310 nm (video)
20 dB
30 km (18.6 mi)
§
<15.6 mW
1550 nm (data)
20 dB
30 km (18.6 mi)
§
<10.0 mW
*The FT85011 transmitter/FR85011 receiver is classified by the FDA as a Class 1 laser product.
†
Optical power budget is specified using 62.5/125 µm fiber. When using 50/125 µm fiber,
subtract 4 dB from the optical power budget.
subtract 4 dB from the optical power budget.
‡
Maximum transmission distance is limited by fiber bandwidth.
§
Maximum transmission distance is based on attenuation of 0.5 dB/km plus a 5 dB buffer for
connector and splice losses.
connector and splice losses.
C1642M-A FT85011.book Page 29 Wednesday, January 19, 2005 12:46 PM