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B.4.2
LNB Power and Control
The Multi-Format Receiver provides LNB power and control signals through the
active RF input connector. LNB power and controls are enabled through the Satellite
Input Menu, see Annex C, Menus.
The Multi-Format Receiver supports voltage controlled LNBs only. The LNB power
circuit provides automatic protection against short circuits in the LNB or its cable.
When the short circuit has been removed recovery is automatic. Switchable boost of
the LNB voltage to allow for losses in long cables and control of 22 kHz tone
insertion are provided. The LNB power characteristics comply with IEC 1319-1 and
are as per Table B.13.
Table B.13 LNB Power and Control
Parameter
Voltage
Current
LNB control
Tone amplitude
Boost voltage
B.4.3
TTV G.703 (DS3 and E3) OTTV G.703 (DS3 and E3) (Option Card)
Table B.14 TTV G.703 Input Specification
Input
Safety status
Connector type
Input impedance
Data rate
Network Type
Network
Specification
Reed-Solomon
7
Receive Polarisation: As specified in ETS 300 784: Satellite Earth Station and Systems (SES); Television Receive-only (TVRO) earth
stations operating in the 11/12 GHz frequency bands.
EN/LZT 790 0003/2 R1A
Specification
Voltage V (nominal)
13
18
350 mA maximum
22 ± 2 kHz tone
0.65 ±0.2 Vp-p
1 V typical
Specification
SELV
BNC, Female
75 Ω
DS3: 45 Mbps
E3: 34 Mbps
PDH
CCITT (ITU-T) G.703
On/Off, Not available in 188-packet mode
Technical Specification
Receiver
Polarisation
7
Vertical/circular right
Horizontal/circular left
B-15
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