5-14
The 4190-9010 Coupler (271-012) is used with the 565-261 Fiber Optic Media Board,
revision “C” or higher. Two 4190-9010 Bi-Directional Couplers are required per
connection, one at each node.
The 4190-9010 is equipped with type ST connectors. To make type ST to type ST
connections, an ST to ST coupler, by others, is required. ST to ST Couplers are available
from:
Black Box, part # FO200
Fiber Instrument Sales, part # F1-8101
Newark Electronics, part # 95F2097
(or equivalent)
Table 5-3. Dual Fiber Optic Cable Communications Distance Examples
Fiber Type
1*
MIFL
2
Power
Margin
Distance
3
Budget
3
4 dB/km 4 dB 10,000 ft (3.05 km)
50/125
numerical
aperture = 0.2
3 dB/km 3 dB 15,000 ft (4.57 km)
17 dB
4 dB/km 4 dB 13,000 ft (3.96 km)
62.5/125
numerical
aperture = 0.275
3.75
dB/km
3 dB 15,000 ft (4.57 km)
21.4 dB
*See notes at bottom of page.
Table 5-4. Single Fiber Optic Cable Communications Distance Examples
Using 4190-9010 Bi-Directional Couplers
Fiber Type
1
MIFL
2
Power
Margin
Distance
3
Budget
3
4190-9010
Coupler Loss
ST to ST
Coupler Loss
50/125
numerical
aperture = 0.2
3 dB/km
7,650 ft
(2.33 km)
3 dB
62.5/125
numerical
aperture = 0.275
3.2 dB/km
2 dB
8,200 ft
(2.5 km)
21.4 dB 9.4 dB
2 dB
Notes for Tables Above:
1. Cable specifications are for 50 or 62.5 micron core with 125 micron cladding, multi-
mode graded index fiber. Wavelength = 850 nm.
2. MIFL = Maximum Individual Fiber Loss. Numbers shown are for example reference
only, refer to specific cable for exact specification.
3. Maximum cable length is determined by distance listed or by reaching budget value,
whichever is shorter. Maximum distances listed for dual fiber cable are shorter than
would be calculated. Budget using 4190-9010 Bi-Directional Coupler is the same with
either size cable because the coupler input cables are 62.5/125 fiber allowing launch
power to be the same.
Continued on next page
Step 4. Wiring Network Cards, Continued
4190-9010 Coupler
Requirements
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