Examples: Max. span calculation for cables with fusion or mechanical splices:
Variable values: Available optical power = 5.5 dB, two splices.
Two fusion splices (5.5 dB) - (2 splices x 0.3 dB max loss per splice) / (4 dB/km) = 1.22 km
Two mechanical splices: (5.5 dB) - (2 splices x 0.5 dB max loss per splice) / (4 dB/km) = 1.12 km
13.4.12 Honeywell ST-type connector cable assemblies
Honeywell can provide short fiber optic ST-type connector cable assemblies. You order by part
number and cable length.
13.4.13 Link A and B cable length differences
The maximum difference in fiber optic cable length between Link A and Link B must be less than
500 meters (1640 feet) to limit the communications delay difference between Link A and Link B.
13.4.14 Allowable standard I/O Link extender cable signal loss
The Standard I/O Link Extender cable:
l Must have a total signal loss equal to or less than -5.5 dB at a wavelength of 850 nanometers.
l Fiber loss is measured at 22 degrees C ±3 degrees and is usually stated as a mean value.
l Individual fiber losses may be as much as 25% greater than the mean.
13.5 Single mode fiber optic extender
The single mode fiber optic module is built by a third-party company and the IOTA by Honeywell for
use with Experion Series C I/O Family or HPM I/O Family. The single mode FOE supports the
extension of the I/O Link beyond the Series C Cabinet with the C300, enabling remote applications
of the Series C I/O and PM I/O.
The single mode FOE is available in two mounting options.
l IOTA - The FOE modules are mounted on the dedicated IOTA board and installed within the
Series C Control Cabinet on vertically mounted carrier channel assemblies
l DIN RAIL - The FOE modules are mounted on the DIN rail within the cabinet.
The following figure displays a sample single mode FOE and its IOTA.
