Application with EK1501-xxxx

The EK1501, EK1501-0010, EK1501-0100 is intended for application with fiber optic cables with the following characteristics:

SC duplex connector
EK1501, EK1501-0100: Duplex multi-mode 50/125 µm or 62.5/125 µm (inner/outer core diameter). The use of both diameters is possible. However, the use of 50/125 µm is recommended due to the lower attenuation.
EK1501-0010: Duplex single-mode 9/125 µm (inner/outer core diameter). A typically usable cable can be manufactured according to the specification ITU-T G.652.D (0.4 dBm/km at 1310 nm).

	Recommended connectors The use of SC/PC connectors is recommended for connecting the EK1501-xxxx Couplers. The advantage of the "PC" (physical contact) version of this connector is the crowned end face, which allows the region of the fiber core that is relevant to transmission to be optimally joined when the connector is pushed together. Other versions include, for instance, the SC/UPC(ultra-polish PC), SC/HRL (high return loss) and the SC/APC plug (angled physical contact). An additional feature of these connectors is that light that is reflected by the connector's end face, which is at an angle of about 8° to the fiber axis, is refracted from the core by the cladding glass into the air. This avoids interference with the data transmission, optimizing the core size of the back-scatter.

In fiber optic the wavelengths 850 nm and 1310 nm are usually used for data transmission. Commercially available fiber optic cables are usually optimized for application in one of these ranges, since signal attenuation is frequency-dependent (like in copper cable), so that large ranges of several km can be achieved for the respective wavelength. Fiber optic cables in the 1310 nm window generally have lower attenuation than cables in the 850 nm window.

In the EK1501-xxxx a transceiver with the wavelength of 1310 nm is used.

	Range and bandwidth product Fiber optic cables are available in different qualities from reputable manufacturers. One of the relevant parameters for the user is the frequency-dependent bandwidth product of a cable, specified in [MHzkm]. The greater the bandwidth product, the lower the attenuation, and therefore the larger the range that can be achieved with this cable (see ITU-T G-651). To achieve the maximum range with the EK1501-xxxx, fiber optic cables with the highest possible bandwidth product at 1310 nm should therefore be used - the use of class OM2 fiber optic cables (EN50173:2002) is recommended. Standard fiber optic cables have a bandwidth product of at least 500 MHzkm at 1310 nm, higher quality ones for distances > 500 m over > 1000 MHz*km. In order to achieve the maximum range, the device to which the EK1501-xxxx is connected must also support such ranges.

	Installation notes permitted bending radius permitted tensile strength sensitivity of the exposed contact ends

Further information can be found in the following documents:

ITU recommendation ITU-T G.651 - G.655
EN 50173:2002
EN 60793-2

Connecting and disconnecting the fiber optic cable at the junction

Notice

Risk of damage to the cable!

To disconnect the fiber optic cable always pull the connector to release the locking mechanism - never pull the fiber optic cable itself!

	Cross-over cables Please note that when connecting the EK1521, EK1521-0010 to the EK1501-xxxx, "cross-over" cables may have to be used to establish a connection. Practical tip: In many cases, the infrared light emission can be made visible using a digital/mobile phone camera on the junction or coupler (see illustration). Avoid "light meeting light" when connecting the fiber optic cable (Tx → Tx). In this case, no connection can be established and the cables must be crossed (Tx → Rx). Figure: Visualization of infrared light at the SC Duplex connector

	Use of blind plugs To protect the transceiver against environmental influences, unused sockets should be sealed using the blind plugs provided! Figure: Blind plugs in unused sockets