Andrew Wireless Innovations Group RPT-MMR8L User Manual
User’s Manual for Remote Unit
MMR8L L
Page 20
M0106ASB.doc
4.2.5. Connection of the Antenna Cables
The remote unit has an N-type antenna connector or can be delivered with a 7/16
adapter. For its location please refer to figure 4-3 Connector flange. For mounting the
cable connectors, it is recommended to refer to the corresponding documentation of
the connector manufacturer. The bending radius of the antenna cables must remain
within the given specifications.
For the selection of cable and antenna it should be considered that a cable with
higher loss is less expensive but on the other hand it impairs performance.
It is sufficient to tighten the N-type (or 7/16) antenna connectors hand-
tight. The use of a tool (like pliers) may cause damage to the connector
and, therefore, lead to a malfunctioning of the remote unit.
tight. The use of a tool (like pliers) may cause damage to the connector
and, therefore, lead to a malfunctioning of the remote unit.
4.2.6. Optical Fibre Cable Connection
In case of a backbone structure it has to be guaranteed that there is a
minimum wavelength difference of 20 nm. This will be guaranteed by
using four different optical interfaces with four different wavelengths
according to ITU grid. Thus, there are also four different remote units.
In one optical backbone, each type of unit can only be used once!
minimum wavelength difference of 20 nm. This will be guaranteed by
using four different optical interfaces with four different wavelengths
according to ITU grid. Thus, there are also four different remote units.
In one optical backbone, each type of unit can only be used once!
Rules for optical fibre connection
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.
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 E9/125µm 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