3.5.
OPTICAL-FIBRE-CABLE CONNECTION - RULES
Optical signals are transmitted by use of optical fibres. When connecting these fibres
observe the following instructions.
Note: Care should be taken when connecting and disconnecting
fibre-optic cables. Scratches and dust significantly affect system
performance and may permanently damage the connector. Always
use protective caps on fibre-optic connectors not in use.
In general, optical fibres do not need special protective measures. However,
protection against environmental influences e.g. rodents and humidity must be
considered.
The optical fibre is a single-mode fibre. Type is E9/125 µm with the following
minimum requirements.
Attenuation: <0.36 dB / km @ 1310 nm
/
<0.26 dB / km @ 1550 nm
Dispersion: <3.5 ps / nm km @ 1310 nm
/
<18.0 ps / nm km @ 1550 nm
The specified bending radius of the optical fibres must not be exceeded. The pigtails
for the connection between mini master and remote unit must have a sufficient
length. A protection for the feeding into units must be given. For ION-M8P S, the
system attenuation of the optical fibres, including the connectors, must not exceed 10
dB.
System attenuation and attenuation of optical components must be determined. This
can be achieved by measuring attenuation and reflection with an appropriate
measuring instrument. For pigtails, a total value of < 0.4 dB (measured to a reference
plug) can be assumed due to the dead zone of the reflectometer. These
measurements must be made with a sufficient length of optical fibre, at the input and
output of the device which has to be measured.
Fibre-cable connectors have to be of the same type (E2000APC) as the connectors
used for the unit. The fibre-optic cables are connected to the optical transceiver.
Angled connectors are not compatible with straight optical connectors;
non-compatibility of connectors will result in permanent damage to
both connectors.
Before connecting the fibre cables, follow the procedure below to ensure optimized
performance. It is important for these procedures to be carried out with care:
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