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The second block diagram shows the combination of the sat-nms LSM L-Band Switch Matrix with
the sat-nms LFRX L-Band Fibre Optical Receivers. So you use the LFRX card directly in our
switch matrix.

5.1 Frequency bands

While the fibre optical links where designed by SatService GmbH mainly for the transmission of
the satellite L-Band frequency band (950 to 2150MHz) also a broadband version from 50MHz to
2150MHz is available. So this link type can also be used to transmit the traditional 70 or 140MHz
IF bands of satellite ground stations and a microwave link. But also other terrestrial applications
are feasible like the transmission of GSM signals in the 800 and 1800MHz frequency bands.

sat-nms LFRX-L and LFTX-L --- 950 to 2150MHz
sat-nms LFRX-B and LFTX-B --- 50 to 2150MHz
sat-nms LFRX-10 and LFTX-10 --- 950 to 2150MHz and 10MHz reference frequency for
BUC
sat-nms LFRXO10 and LFTXO10 --- 10MHz only

As a unique feature the sat-nms LFTXRX modules can transmit L-Band and 10MHz signals
together on one single fibre connection. This is a growing application for VSAT and satellite
ground station transmit chains which make use of Block Up-Converter (BUC). These BUCs very
often need a 10MHz reference frequency signal for their internal local oscillators. This is
generated within the satellite modem and also transmitted via the coaxial L-Band output.

By using the LFRX-10/LFTX-10 link, it is not possible to monitor or to adjust the level of the
10Mhz signal with the internal adjustable attenuator. If you have to do so, or if you want to set up
a 10MHz only link, sat-nms LFRXO10/LFTXO10 Version is the right choice. It provides internal
attenuation function as well as signal level measurement for your 10MHz signal.

The sat-nms LFTXRX fibre optical link can transmit this combined/multiplexed frequency signals.
Each fibre optical link (FOL) consists of two destinations which are interconnected via a fibre
optical cable. On one side of the link is the optical transmitter and on the other side is the optical
receiver. Both modules are Euro card sized (100x160mm) printed circuit boards which are

(C) 2021, SatService GmbH

www.satnms.com

LF20-UM-2107 Page 39/43

Содержание SatService sat-nms LF20

Страница 1: ...nms LF20 User Manual Version 1 2 008 Copyright SatService Gesellschaft f r Kommunikationssysteme mbH Hardstrasse 9 D 78256 Steisslingen satnms support satservicegmbh de www satnms com www satservicegm...

Страница 2: ...Optical Links 17 3 Operation 17 3 1 The Web based User Interface 17 3 2 State Display Readings 18 3 2 1 Reading of LFRX receiver card 19 3 2 2 Reading of LFTX transmitter card 20 3 2 3 Reading of LFS...

Страница 3: ...39 5 1 Frequency bands 40 5 2 Connectors 40 5 3 Controller Module 41 5 4 Redundancy switching 41 5 5 Outline Drawing 42 6 Specifications C 2021 SatService GmbH www satnms com LF20 UM 2107 Page 2 43...

Страница 4: ...LFTXRX 2 5 1 Optical receiver transmitter and switch cards 2 5 2 Power connectors and power supplies 2 5 3 DC and data connectors 2 5 4 RF connectors 2 5 5 Optical connectors 2 5 6 optional 75Ohm conv...

Страница 5: ...optical transmitter which converts from IF input spectrum to optical output at 1310nm sat nms LFRX optical receiver which regenerates the optical signal back to an IF spectrum SatService offer the LF...

Страница 6: ...the sat nms LFTXRX either through a TCP IP network connection or through the RS232 interface of the sat nms LFTXRX This chapter describes the communication protocol used for remote control and lists...

Страница 7: ...d directly with a crossover cable The initialization program does not work through routers intelligent or network switches Hence the typical sequence of tasks when putting an sat nms LFTXRX into opera...

Страница 8: ...rfacing equipment will behave switch off the LNC supply voltage in the Setup menu or in case of local controlling by hardware switch before you connect the cable The LFTXRX can be damaged if the total...

Страница 9: ...d Ethernet network card A CAT5 crossover network cable or a Ethernet hub switch and standard network cables to connect the LFTXRX and the computer The CD ROM shipping with the sat nms LFTXRX Setting t...

Страница 10: ...he Yes button to set the new parameters at the LFTXRX chassis Now the IP configuration of the chassis is completed You may finally want to test if the LFTXRX chassis is reachable now Start your web br...

Страница 11: ...sing a hub you need a crossover cable for this with swapped RX TX lines To meet mentioned EMC standards use double shielded twisted pair CAT7 S FTP Network cable e g DRAKA UC900 SS27 Cat 7 PUR Take ca...

Страница 12: ...the chassis On the front side of the enclosure you find 20 slots where up to 20 cards can be placed in Read chapters Config Parameters and Setup Parameters for instructions how to use this configurat...

Страница 13: ...th the connectors on the backplane ATTENTION To avoid the possibility of an electrical shock never handle with a power supply that is connected to mains 2 5 3 DC and data connectors The Alarm and data...

Страница 14: ...sed if ok open in fault state 7 COM2 common for fault relay 2 te ts 8 9 not connected J1 3 Serial connector Pin RS232 serial interface DCE DSUB 9 female 1 not connected 2 TxD output 3 RxD input 4 not...

Страница 15: ...FTX card the attenuator is additionally taken into account see block diagram 2 5 5 Optical connectors ATTENTION Optical Radiation If connected to a power supply the sat nms LFTXRX provides invisible l...

Страница 16: ...nal attenuation therefore unused ports do not have essentially to be terminated A special Version with lower attenuation is available on request Up to 10 LFRXv4 might be installed to one sat nms LFTXR...

Страница 17: ...e optical links you have to take care that the input signals do not exceed the maximum levels see Specifications on last page of this document Start with 0dB gain settings on LFRX and LFTX card In thi...

Страница 18: ...the optical links for the chassis Alarm log The alarm log shows all occurred alarms with time and date Setup This button switches to the Setup page which lets you inspect or change less common paramet...

Страница 19: ...e first of 2 redundancy switching criteria if the redundancy switching option is installed and activated When this value falls below 0 22mW redundancy switching will be initiated RF Pwr This value sho...

Страница 20: ...ware remote local switch on the corresponding card is shown here Gain An integrated attenuator makes it possible to attenuate the RF signal in 1dB steps from 16 to 15dB The selected value is displayed...

Страница 21: ...page and the remote interface This is the second of 2 redundancy switching criteria if the redundancy switching option is installed and activated When this value falls below configured threshold valu...

Страница 22: ...layes the actual position setting A or B path No Card Pos A Display the Slot number of switch position A This is a Config Parameter in the software but also the hardware interconnection from the switc...

Страница 23: ...a drop down box You may change the parameter to the desired value and then click to the Submit button to pass the changed value to the LFTXRX The receiver automatically returns to the settings page wh...

Страница 24: ...the displayed value matches the real values at the I O RF connectors without options about 42 RF Thresh The RF threshold defines the RF fault level If the RF level under runs the threshold the RF thre...

Страница 25: ...ng that has not to be changed by the customer Depending on the LFTXRX chassis configuration the card has different internal RF attenuation This value defines the offset to guarantee that the displayed...

Страница 26: ...re the desired slot name and press the submit button Card Type To change the card type click on the field and a new page will be opened Now choose the desired parameter RX TX SW NONE from the drop dow...

Страница 27: ...are assumed to be changed less frequently than the operational parameters on the configuration page The page displays a table with the parameters actually set Each parameter value is a hyper link to a...

Страница 28: ...n text protocol SNMP Configuration Read Community Sets the SNMP community string expected for read access The default is public Write Community Sets the SNMP community string expected for write access...

Страница 29: ...erface IP RS232 SNMP If you switch to local the local setting of the gain DC out switch position will taking in acount If you switch back to remote the local settings will transfer to the MNC settings...

Страница 30: ...ont panel keyboard of the LFTX RX chassis Additionally you can measure the following parameters Parameter Description TPout 10dB The testport gives you the opportunity to measure the RF Level on the F...

Страница 31: ...M LC This DIP switch defines if the card is controlled remote RM or local LC If the switch is in the LC position it is not possible to change the parameters of this card via remote Interface IP RS232...

Страница 32: ...t gives you the opportunity to measure the RF Level of the standby link 4 Remote Control The sat nms LFTXRX L Band Optical Link chassis may be controlled remotely by a monitoring and control applicati...

Страница 33: ...yntax is OK but contains an unknown parameter name is used the reply is UNKNOWN Numeric parameters are cut to the limits defined for this particular parameter Misspelled choice values cause the LFTXRX...

Страница 34: ...n as MOD95 or Miteq protocol The LFTXRX also packs it s reply in a protocol frame as described above incomplete frames checksum errors or address mismatches let the device ignore the message The time...

Страница 35: ...tor present of each slot 1 installed 0 not installed remm r o card1 card20 0 1 Remote 1 or Local 0 setting of each card rdsw r w card1 card20 0 1 Redundancy switched indication of each slot 1 has swit...

Страница 36: ...stm r w card1 card20 n a u d gain step u 1dB up d 1dB down n a response lnbm r o card1 card20 OFF ON LNB DC supply for each slot rdpr r w card1 card20 OFF ON Redundancy setting for each individual slo...

Страница 37: ...lt Message The commands alrm return a text string which shows the fault status of the master or slave chassis Syntax S power supply faults R rf faults O optical faults L lnb faults T threshold faults...

Страница 38: ...e lines are wrapped in this example for better readability Plugged unplugged Cards The commands plcm and return a comma separated list of the state of all boards http 10 0 0 1 rmt plcm This returns fo...

Страница 39: ...s a satellite receive and transmit application with two antennas and at different locations but with one sat nms LFTXRX chassis which handles all signals from both antennas and the uplink signal to th...

Страница 40: ...nals together on one single fibre connection This is a growing application for VSAT and satellite ground station transmit chains which make use of Block Up Converter BUC These BUCs very often need a 1...

Страница 41: ...and other features are always included wherever possible This is only not the case in the broadband and 10MHz boards as this makes no sense here in any case and the inductors of the LNC voltage supply...

Страница 42: ...capability The redundancy switching capability is defined by the use of the sat nms LFSW switch card in the sat nms LFTXRX chassis and how the switches are route internally to that card There is no l...

Страница 43: ...hm as option L band input test connector Transmitter SMA female 50 Ohm L band output test connector Receiver SMA female 50 Ohm Optical connectors E2000 APC or FC APC Input Return Loss 17dB Output Retu...

Страница 44: ...C Interface Specification Ethernet interface for M C and user interface 10 100 Base T Via http GET requests RS232 M C Interface D SUB 9 female Summary fault indication Relay contact D SUB 9 male Elect...

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