Andrew Wireless Innovations Group RPT-MMR8-19I User Manual
User’s Manual for Remote Unit
MMR8/19
Page 28
M0106A7E.doc
4.2.6. Optical Fibre Cable Connection
Optical signals are transmitted by use of an optical fibre for each remote unit.
F
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.
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.
protection against environmental influences e.g. rodents and humidity must be
considered.
The optical fibre is a single mode fibre. Type is E9/125µm with the following minimum
requirements.
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 master unit and remote unit must have a sufficient length.
A protection for the feeding into units must be given. The system attenuation of the
optical fibres, including the connectors, must not exceed 10 dB.
for the connection between master unit and remote unit must have a sufficient length.
A protection for the feeding into units must be given. 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.
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 (E2000/APC8°) as the connec-
tors used for the unit. The fibre optic cables are connected to the optical transceiver.
tors used for the unit. The fibre optic cables are connected to the optical transceiver.
F
Note:
Angled connectors are not compatible with straight optical
connectors; non-compatibility of connectors will result in
permanent damage to both connectors.
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:
performance. It is important that these procedures are carried out with care:
Ø
Remove fibre optic protective caps.
Ø
Do not bend the fibre optic cable in a tight radius (< 4 cm) as this may cause
cable damage and interrupt transmission.
cable damage and interrupt transmission.