User Manual

4 Installation
ID No: 163511 Page 21
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 MMR8L L 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 in- 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.
) Note: 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 that these procedures are carried out with care:
¾ Remove fibre optic protective caps.
¾ Do not bend the fibre optic cable in a tight radius (< 4 cm) as this may cause
cable damage and interrupt transmission.
¾ Using high-grade alcohol and lint-free cotton cleaning swabs, clean the end of
the fibre optic cable that will be inserted in the optical connectors on the donor
interface box.
¾ Blow out the laser receptacle with clean and dry compressed air to remove
any particulate matter.
¾ Connect the fibre optic cables by inserting the cable end into the laser
receptacle and aligning the key (on the cable end) with the keyed slot.
¾ Do not use any index matching gels or fluids of any kind in these connectors.
Gels are intended for laboratory use and attract dirt in the field.