Cambium Networks 58XX-T User Manual

13 Annex A - Gemini OS 58XXC

13.1 Scope

This Annex details the changes and additional features relevant to the connectorised
variant of the Gemini Product, OS 58XXC.

13.2 Product Description

13.2.1 Hardware

The OS58XXC is a variant designed to provide the system integrator and installer with
the ability to provide extra capability to cope with very difficult radio links compared to
the basic Gemini product. The variant allows the use of a variety of externally mounted
antennas, either Flat Plate or Dish, which have higher gains than provided by the
integrated antenna that is normally used.
The OS 58XXC is shown as Fig 38.

Figure 1 : 58XXC Outdoor Unit

13.2.2 Antenna Choices

The integrated antenna has a gain of 23dBi. External antennas from the list in Table 10
can be used with the OS58XXC. These are approved by the FCC for use with the
product and are basically constrained by the following limits:

• Single Polarisation Flat Plate Antennas – up to 28dBi per antenna

• Single/Dual Polarisation Parabolic Dish Antennas – up to 37.7dBi per polarisation

or antenna
All external antennas – cable loss between OS 58XXC and the antenna ports must not be
less than 1.2dB

13.3 Software/Features

The variant operates in the same way as the basic Gemini product and is released initially
with the feature set of the OS 5815 product. The areas where the functionality is
modified are

13.3.1 Status Page

The link loss calculation presented on the Status Page on the management interface has to
be modified to allow for the increased antenna gains at each end of the link. The
manufacturing process of the OS5815C configures the standard hardware of the unit for
use with external antennas. The installer is prompted, as part of the installation process,
to enter the gain of the external antenna(s) and cable losses at each end of the link. Peer­Peer messaging is used to pass the effective antenna gain to each end of the link so that
the link loss calculations can be correctly computed.

Figure 2 : Example Status Page (showing new hardware Version data for Connector
Version)

13.3.2 Installation Pages

The installer is prompted to enter the Antenna Gain and Cable Loss (OS 5815C to
antenna) at each end of the link. The Installation Page(s) is shown as Fig 40/41

Figure 3 : Amended Installation Wizard Page

Note: In the event that there is a significant difference in length of the antenna cables for
the two antenna ports, then the average value should be entered.