Honeywell Series 8 I/O - Allowable standard I;O Link extender cable signal loss

9. Series 8 I/O Link Fiber Optic Extenders (FOE)
9.4. Defining the Fiber Optic topology
254 Series 8 I/O User's Guide R500
Honeywell April 2017
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 communication delay difference between
Link A and Link B.
Allowable standard I/O Link extender cable signal loss
The Standard I/O Link Extender cable:
 Must have a total signal loss equal to or less than -5.5 dB at a wavelength of 850
nanometers.
 Fiber loss is measured at 22degrees C ±3 degrees and is usually stated as a mean
value.
 Individual fiber losses may be as much as 25% greater than the mean.