| F-TEL | Fiber Optic Phone Adapter | 283-100-03/01 | 180 KB |   |
| FCD-155 | STM-1/OC-3 Terminal Multiplexer | 180-100-09/07 | 642 KB |   |
| FCD-155E | STM-1/OC-3 Add/Drop Multiplexer | 460-102-04/08 | 710 KB |   |
| FCD-1L | T1 or Fractional T1 CSU/DSU | 170-100-01/97 | 147 KB |   |
| FCD-24 | Integrating E1 Multiplexer | 214-100-05/98 | 152 KB |   |
| FCD-2L | E1 or Fractional E1 Access Unit | 171-100-11/05 | 386 KB |   |
| FCD-E1A | E1 or Fractional E1 Access Unit | 201-100-01/06 | 764 KB |   |
| FCS-155 | Fibre Channel to STM-1/OC-3 Converter | 393-100-12/05 | 399 KB |   |
| FCS-622 | Fibre Channel to STM-4/OC-12 Converter | 396-100-12/05 | 388 KB |   |
| FOM-5A, FOM-6A | Asynchronous Fiber Optic Modems | 307-100-02/08 | 245 KB |   |
| FOM-6MP | Asynchronous Fiber Optic Multipoint Modem | 314-100-01/06 | 402 KB |   |
| FOMi-40 | Fiber Optic Modem with Remote Management | 315-100-12/07 | 1358 KB |   |