With DMD, distinct pulse propagating down the cable longer remains distinct pulse or, extreme cases, can become two independent pulses. frequency-independent.
U-277
Accessories
Systems
Fibre optic
Communication technology
.
DMD
DMD-Measureme4nt (differentialmode delay). The value the loss factor depends the insulant, the insulation design, the frequency and the temperature. Due the current superseding, disappears high frequencies.
Informations
Technical changes reserved. derived subtracting the attenuation the interfering pair from the far end crosstalk (FEXT) that has caused the interfered pair. The outer inductance determined line geometry and the magnetic material qualities. Instead the often strongly frequency dependent parameter G’s the factor (Q=theta) indicates the loss factor.
ELFEXT
Equal Level FEXT calculation that normalizes the results FEXT measurement, because takes attenuation into account. The IEEE 802. should small possible and generally constant. With DMD, single laser light pulse excites few modes equally within MMF cable. Lasers function the baud rates and longer distances required for Gigabit Ethernet. Strings pulses tend interfere with each other, making difficult recover data reliable fashion. These paths may different lengths and have different transmission delays the light travels through the cable. corresponds the difference between the capacitance wire the screen and the capacitance wire the screen. These modes, light pathways, then follow two more different paths. For shielded, symmetrical cables the frequency dependent cover inductance well the inductance produced proximity effect must taken into account. Since mainly nonferromagnetic metals are used conductor, also independent the current intensity. influences the transmission characteristics the cable. 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.
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.3z Gigabit Ethernet Task Force has identified the DMD condition that occurs certain circumstances with particular combinations lasers and MMF cable.Technical terms used data cable technology
Distributed Inductance L’
The distributed inductance consists several parts. The inner inductance can explained the current flow and the magnetic fields connected with that the conductor.
Distributed Leakage G‘
Copper screened Copper
It describes the insulation losses, the dielectric losses well the Corona losses between the wires
