9.620 Scopus-IRD2900-SNMP

This page describes the device driver and the device window for the Scopus 2900 IRD family, accessed by SNMP. Actually, the driver supports IRDs housing a single RF frontend and a single MPEG decoder.

Device window pages

The following table shows which device window pages are available with this individual device type. Tool-bar functions not mentioned here are described at the general description of device windows .

• --- Contains the main receiver settings and status display.
• --- Contains the parameters concerning decoder input signal selection and the digital video output.
• --- Contains the conditional access parameters (BISS).
• --- Contains the parameters concerning the video output (Analog video format selection etc.)
• --- Contains the audio output parameters for all four audio outputs of the receiver.
• --- The faults page.
• --- The device info page.
• --- The maintenance page. The configuration parameters described below are set at this page.

Configuration parameters

At the maintenance page of the device window there are a couple of configuration parameters which must be set to make the software talk to the Scopus IRD.

LO Frequency Calculation

The IRD itself does not provide a method to select two free definable LO frequencies which are selected by the desired input frequency. The sat-nms device driver works around this with the following trick:

With the configuration parameters frequencyRange=Ku-BAND and loType=NUMERIC-Ku-Band (or C-Band and NUMERIC-C-BAND respectively) are set, the device driver sets the applicable LO frequency at the IRD every time before the receive frequency is set. This tunes the receiver to the correct L-band frequency and displays the receive frequency in Ku-band or C-band as expected. Unlike the LO-frequency calculation built into the receiver, this also works with non-standard LO frequencies.

Remark: If you change the LO frequencies in the configuration dialog, this will not become effective until you set a new receive frequency at the IRDs main page.

DVB Mode Selection With RX-Channel-Select-CDB

The Scopus IRD2900 does not provide a separate parameter to set the DVB-S / DVB-S2 mode. It instead uses the modulation parameter to set the DVB mode and the modulation mode as a combined setting.

To make the sat-nms RX-ChannelSelect-CDB logical device set the DVB mode properly with a channel definition, the driver provides a parameter called hidden.dvbMode . This parameter sets the modulation setting to DVBS-QPSK for DVBS and to DVBS2-N-8PSK for DVBS2. When reading back this parameter, the driver interprets everything which is not DVBS-QPSK as DVBS2. This means, the DVBS/DVBS2 setting may be reported wrong if the setting has been made from another source than the RX-ChannelSelect-CDB device. As soon as there is another channel definition applied from the RX-ChannelSelect-CDB device, the parameter ist set correctly.

Variables defined by this device driver