4-14
Chapter 4 Networking
Step 4. Wiring Network Cards (continued)
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 number FO200
Fiber Instrument Sales, part number F1-8101
Newark Electronics, part number 95F2097
(or the equivalent)
Notes for Table 4-3 and Table 4-4:
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, which-
ever 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
Table 4-3. Dual Fiber Optic Cable Communications Distance Examples
Fiber Type
1
*MIFL
2
Power
Margin
Distance
3
Budget
3
50/125
numerical
aperture = 0.2
4 dB/km 4 dB 10,000 ft
(3.05 km)
17 dB
3 dB/km 3 dB 15,000 ft
(4.57 km)
62.5/125
numerical
aperture = 0.275
4 dB/km 4 dB 13,000 ft
(3.96 km)
20.4 dB
3.75 dB/km 3 dB 15,000 ft
(4.57 km)
*See notes at bottom of page.
Table 4-4. Single Fiber Optic Cable Communications Distance Examples*
Fiber Type
1
MIFL
2
Power
Margin
Distance
3
Budget
3
4190-9010
Coupler Loss
ST to ST
Coupler Loss
50/125 numerical
numerical = 0.2
3 dB/km
2 dB
7,650 ft(2.33
km)
21.4 dB 9.4 dB
3 dB
62.5/125 numerical
aperture = 0.275
3.2 dB/km 8,200 ft (2.5
km)
2 dB
*Examples made using 4190 9010 Bi-Directional Couplers