4190-9010 coupler requirements
The 4190-9010 Coupler (271-012) is used with the 565-261 Fiber-Optic Media Board, revision “C” or higher, the 566-376, or the 746-109. 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)
Figure 21: Coupler wiring
The available communications distance is determined by the properties of the specific fiber cable used, the overall link topology, and the
available power budget.
Table 4: Dual fiber-optic cable communications distance examples
Fiber Type 1* MIFL 2 Power margin Distance 3 Budget 3 Coupler/Splice Loss
50/125
numerical aperture = 0.2
3 dB/km 3 dB 15,000 ft (4.57 km) 17 dB
62.5/125
numerical aperture = 0.275
3.50 dB/km 3 dB 15,000 ft (4.57 km) 20.4 dB
0.75dB max for each mated pair
connection
0.30dB max for each fusion splice
* See notes at bottom of page
Table 5: 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:
1. Fiber Type: 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. Distance: The maximum distance between nodes is determined by the total loss from the transmitter to the associated receiver (fiber loss,
connector loss, splice loss and safety margin) or the maximum distance listed, whichever is smaller. Budget using 4190-9010 Bi-Directional
Coupler is the same with either size cable. The coupler input cables are 62.5/125 fiber which allows launch power to be the same.
4. Link Budget: Measure attenuation at wavelength 850nm.
5. Dual fiber optic distances are for 746-109, 565-261 and 565-376 fiber media modules. Single fiber-optic distances require use of 4190-9010 Bi-
Directional Couplers.
page 20 579-182 Rev. V
4100/4120-6014, 4100-6078 NICs and 4100/4120-Series Media Modules Installation Instruction
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