Albedo xGenius - Configuring the Built in GNSS Receiver

To Next Page

To Previous Page

Connection to the Network

2.6.2. Configuring the Built in GNSS Receiver

xGenius units may optionally be equipped with a built in GNSS receiver. These units

have a SMA female connector suitable for connecting an external antenna. Units with

the built in GNSS receiver are also supplied with a compact antenna with 5 m of coaxial

cable plus a 10 m extension cable.Using a different antenna is possible as long as the

specifications of the GNSS module are taken into account.

The GNSS interface can be used to synchronize the system time with a satellite

constellation but in certain test units, some results may depend on the GNSS timing

source. It this case, the test application may enable the GNSS reception on its own. In

both cases, the GNSS state can be verified through the same Clock reference sub-

menu. To display the GNSS status follow this procedure.

1. Attach the GNSS antenna to the unit. Make sure that the antenna sees as much of

the sky as possible. The unit may fail to achieve synchronization if there are not

enough satellites in sight. Some tests may loss accuracy if the number of satellites

in sight is reduced.

1. From the Home panel, go to CONFIG,

The port setup panel is displayed.

2. Go to Reference clock.

3. Configure the clock reference input to GNSS.

4. Go to GNSS receiver.

Termination It configures the input / output impedance of the clock inter-

face where the Port C is going to be connected. The availa-

ble configurations for this field are:

• Endpoint: This connection represents a network termina-

tion point with the nominal impedance (75  for the unbal-

anced port and 120  for the balanced one). The expected

attenuation is the theoretical cable attenuation which

increases with the frequency square root.

• -20 dB monitor: 20 dB protected monitoring point. This is

a connection point that is isolated from the network and it

is specially suited for monitoring purposes. A flat attenua-

tion of 20 dB is expected for these points.

Table 2.12: Clock/PCM input and output interfaces

Parameter Description