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Introduction The I/O Link Extender provides the ability to locate 7-Slot or 15-Slot IOP card files and associated FTAs up to 8 kilometers (5 miles) from the HPMM(s). Two types of I/O Link Extenders and their associated fiber optic couplers are available, the “Standard” I/O Link Extender that provides up to a 1.3 kilometer (4000 feet) link, and the “Long Distance” I/O Link Extender which provides up to an 8 kilometers (5 miles) link. The connection is made using a pair of fiber optic transmission cables, driven and terminated by a fiber optic coupler that mates with the connector located directly below the card file slot in which the I/O Link Extender card is installed. Features An I/O Link Extender consists of two pairs I/O Link Extender cards, one for Link A and one for Link B, and associated fiber optic couplers at each end of the fiber optic link. The I/O Link Extender cards and their fiber optic couplers occupy two slots in an HPMM or IOP card file. Remote card files Every remote card file, or complex of IOP card files, requires two I/O Link Extender cards and two fiber optic couplers, one for Link A and one for Link B. Fiber optic cable length The maximum fiber optic cable length is dependent upon the number of splices and quality of the cable (dB loss per meter of cable). This maximum can be between 0.98 and 1.3 kilometers for the Standard I/O Link Extender and 8 kilometers for the Long Distance I/O Link Extender. I/O Link Extender planning I/O Link Extender planning can be found in Section 11 in this manual. Standard I/O Link Extender Each Standard I/O Link Extender card has an associated fiber optic coupler that can drive up to three pair of fiber optic cables. Each cable pair is terminated by a fiber optic coupler that terminates one fiber optic pair. The Standard I/O Link Extender card will drive and terminate Link A or Link B, depending upon the card file number and slot number number. If the card file number and slot number number are both odd or both even, the card will drive Link A. If the card file number and slot number number are not both odd or both even, the card will drive Link B. Two Standard I/O Link Extender cards, connecting up to six remote card files, can be installed in a HPMM card file, but the maximum number of primary IOPs is still 40 (plus 40 redundant IOPs).