Cabling and Technology Information
| Mode Conditioning Patch Cord |
| The following information applies to installations in which multimode fiber- |
| optic cables are connected to a |
| characteristic called “Differential Mode Delay”, which requires the |
| transmission signals be “conditioned” to compensate for the cable design and |
| thus prevent resulting transmission errors. |
| Under certain circumstances, depending on the cable used and the lengths of |
| the cable runs, an external Mode Conditioning Patch Cord may need to be |
| installed between the |
| network cable to provide the transmission conditioning. If you experience a |
| high number of transmission errors on those ports, usually CRC or FCS errors, |
| you may need to install one of these patch cords between the |
| in your switch and your multimode |
| of the network link. |
| The patch cord consists of a short length of single mode fiber cable coupled |
| to |
| multimode cable on the receive side. The section of single mode fiber is |
| connected in such a way that it minimizes the effects of the differential mode |
| delay in the multimode cable. |
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|
N o t e | Most of the time, if you are using good quality |
| cable that adheres to the standards listed in Appendix B, there should not be |
| a need to use mode conditioning patch cords in your network. This is |
| especially true if the fiber runs in your network are relatively short. |
| Installing the Patch Cord |
| |
| As shown in the illustration below, connect the patch cord to the ProCurve |
| transceiver with the section of single mode fiber plugged in to the Tx |
| (transmit) port. Then, connect the other end of the patch cord to your network |
| cabling patch panel, or directly to the network multimode fiber. |
| If you connect the patch cord directly to the network cabling, you may need |
| to install a |
| together. |
Information | Technology and Cabling |
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