With DMD, single laser light pulse excites few modes equally within MMF cable.
Distributed Leakage G‘
Copper screened Copper
It describes the insulation losses, the dielectric losses well the Corona losses between the wires.
ELFEXT
Equal Level FEXT calculation that normalizes the results FEXT measurement, because takes attenuation into account. corresponds the difference between the capacitance wire the screen and the capacitance wire the screen. With DMD, distinct pulse propagating down the cable longer remains distinct pulse or, extreme cases, can become two independent pulses.3z Gigabit Ethernet Task Force has identified the DMD condition that occurs certain circumstances with particular combinations lasers and MMF cable. influences the transmission characteristics the cable. The IEEE 802. Lasers function the baud rates and longer distances required for Gigabit Ethernet.Technical terms used data cable technology
Distributed Inductance L’
The distributed inductance consists several parts. The outer inductance determined line geometry and the magnetic material qualities. The value the loss factor depends the insulant, the insulation design, the frequency and the temperature. The inner inductance can explained the current flow and the magnetic fields connected with that the conductor. derived subtracting the attenuation the interfering pair from the far end crosstalk (FEXT) that has caused the interfered pair.
Informations
Technical changes reserved.
EMC (Electro Magnetic Compatibility)
The ability for electrical device not influence other devices with its electromagnetic field and also work satisfactorily within the electromagnetic fields other devices.
U-277
Accessories
Systems
Fibre optic
Communication technology
. Due the current superseding, disappears high frequencies.
DMD
DMD-Measureme4nt (differentialmode delay). These paths may different lengths and have different transmission delays the light travels through the cable. These modes, light pathways, then follow two more different paths. The resulting characteristics create additional element ”jitter“ that limits the reach Gigabit Ethernet over MMF cable
Copper unscreened
Earth unbalance
The measurement the difference the electrical performance the individual wires pair earth and the screen. frequency-independent. Strings pulses tend interfere with each other, making difficult recover data reliable fashion. should small possible and generally constant. For shielded, symmetrical cables the frequency dependent cover inductance well the inductance produced proximity effect must taken into account. Instead the often strongly frequency dependent parameter G’s the factor (Q=theta) indicates the loss factor. Since mainly nonferromagnetic metals are used conductor, also independent the current intensity
