D2B FIBER OPTIC CONFIGURATION AND VERSION CODING
D2B general notes
1. Fibers are easily damaged and must be handled with care to prevent cuts, nicks, abrasions, kinks and/or crushing.
2. The minimum bend radius for fibers is 25 mm. A bend radius less than 25-mm will permanently damage the fiber, thus necessitating replacement.
3. Fibers optics have a ring type configuration (i.e. The output of the preceding component is coupled to the input of the following component in a daisy chain type loop. The ring must form a closed loop in order to function [Figure 1]).
4. Light enters the clear fiber (input) and exits the red fiber (output). Each active D2B connector must therefore contain one red and one clear fiber (Figure 1).
5. The red fiber is always on the chamfered side and the clear fiber on the square side of the connector (Figure 1).
6. All fiber connections or couplings should follow a clear to red logic. A coupling must never contain two fibers of the same color (Figure 1).
Note: Due to the keying of the fibers, this would only be possible through forced insertion.
7. Fiber optic (D2B) cables are identified by orange/brown semi-rigid insulation.
8. The fibers are loosely pre-wired with the vehicle electrical harnesses in most applications. The fibers are not affected by electromagnetic interference (EMI) from the bundled vehicle electrical harnesses.
B. Configuring the D2B ring
1. Vehicles delivered from the factory may have active fibers (e.g. optical amplifier and/or factory installed CD), inactive fibers (e.g. no amplifier or accessories installed), or no fibers. Vehicles will vary in accordance with installed equipment. Some vehicles will have all required fibers installed while others will contain additional fiber links in the accessory kit(s). Refer to the respective accessory reference for fiber location information.
2. To remove/install components, the D2B ring must be “broken” and the appropriate adjustments made to the configuration. One or all of the following optical connector styles may be present.
a) In-line couplers (Figure 2) Disassemble by gently prying up from the side of the clip closest the connector, one or both metal spring clips on either side of the connector.
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