| OPF2412 | 
                                        TT Electronics / Optek Technology | 
                                        24 | 
                                        RECEIVER FIBER OPTIC 5MB ST | 
                                    
                                                                    
                                        | OPF2416 | 
                                        TT Electronics / Optek Technology | 
                                        5,000 | 
                                        RCVR MOD FIBR OPTIC 125 MHZ DIP | 
                                    
                                                                    
                                        | OPF2416T | 
                                        TT Electronics / Optek Technology | 
                                        5,000 | 
                                        RECEIVER FIBER OPTIC 125MHZ | 
                                    
                                                                    
                                        | OPF2416TC | 
                                        TT Electronics / Optek Technology | 
                                        5,000 | 
                                        RCVR MOD FIBR OPTIC 125 MHZ DIP | 
                                    
                                                                    
                                        | OPF2418 | 
                                        TT Electronics / Optek Technology | 
                                        5,000 | 
                                        RECEIVER FIBER OPTIC 155MHZ ST | 
                                    
                                                                    
                                        | OPF2418T | 
                                        TT Electronics / Optek Technology | 
                                        5,000 | 
                                        RECEIVER FIBER OPTIC 155MHZ ST | 
                                    
                                                                    
                                        | OPF2418TC | 
                                        TT Electronics / Optek Technology | 
                                        5,000 | 
                                        RECEIVER FIBER OPTIC 155MHZ ST |