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Rev. 1.3

A–1

Appendix A.

SUMMARY OF SPECIFICATIONS

A.1 Modulator

Data rate range

Overall, 2.4 - 512 kbps
2.4 kbps - 256 kbps, Rate 1/2 BPSK
4.8 kbps - 512 kbps Rate 1/2 QPSK
7.2 kbps - 512 kbps Rate 3/4 QPSK
8 kbps - 512 kbps Rate 7/8 QPSK

Operating modes

Transparent, Closed Network
Proprietary EDMAC framed mode - 5% overhead
addition

Scrambling

Transparent mode - per CCITT V.35
EDMAC mode - externally synchronized

FEC

Convolutional, k=7, standard polynomials
BPSK: Rate 1/2
QPSK: Rate 1/2, Rate 3/4 and Rate 7/8

Transmit filtering

6th order Butterworth, aperture and group delay
equalised per INTELSAT IESS 308 (32 to 256 tap FIR
digital filter implementation)

Output frequency

52 - 88 MHz, 100 Hz resolution
(140 MHz band optional, 104 - 176 MHz)
Stability ±1ppm, 0 to 40

Harmonics and
spurious

Better than -55 dBC/4 kHz (typically <-60 dBC/4kHz)

Transmit on/off
ratio

55 dB minimum

Output phase
noise

< 0.24 rms double sided, 100 Hz to 250 kHz
(minimum of 22 dB better overall than the INTELSAT
IESS 308/308 requirement)

Output power

0 to -20 dBm, 0.1 dB steps

Accuracy

±0.5 dB over frequency and temperature

Содержание CDM-500

Страница 1: ...Part Number MN CDM500 IOM Revision 1 3 CDM 500 Satellite Modem Installation and Operation Manual...

Страница 2: ...n the USA Comtech EFData 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 CDM 500 Satellite Modem Installation and Operation Manual Part Number MN CDM500 IOM Revision 1 3 Jul...

Страница 3: ......

Страница 4: ...333 2161 FAX or E Mail can be sent to the Customer Support Department at service comtechefdata com Contact us via the web at www comtechefdata com 1 To return a Comtech EFData product in warranty and...

Страница 5: ......

Страница 6: ...ts or Suggestions Concerning this Manual vii SAFETY NOTICES viii Electrical Safety viii Fuses viii Environmental viii Installation ix Telecommunications Terminal Equipment Directive ix EMC Electromagn...

Страница 7: ...le 5 3 5 4 Auxiliary Serial Connector He1402 3 Pin Header 5 3 CHAPTER 6 FRONT PANEL OPERATION 6 1 6 1 Description 6 1 6 2 Menu Trees 6 3 6 3 OPENING SCREEN 6 4 6 4 SELECT 6 4 6 5 CONFIG 6 5 6 5 1 CONF...

Страница 8: ...2 BUS ADDRESS 6 13 6 5 35 CONFIG REM INTFC ADDR RS485 BUS ADDRESS 6 13 6 5 36 CONFIG MASK Alarm mask 6 13 6 5 37 CONFIG MASK AGC 6 14 6 5 38 CONFIG MASK Eb No 6 14 6 5 39 CONFIG MASK RX AIS 6 14 6 5 4...

Страница 9: ...al Clock 7 1 7 1 2 External Clock 7 1 7 1 3 Loop Timed 7 2 7 2 Receive Clocking 7 2 7 2 1 Buffer Disabled 7 2 7 2 2 Buffer Enabled Rx Tx 7 2 7 2 3 Buffer Enabled Rx Tx 7 2 7 3 X 21 Notes 7 2 CHAPTER 8...

Страница 10: ...lite Modem Preface Rev 1 3 v B 5 Packet Structure B 3 B 5 1 Start Of Packet B 3 B 5 2 Address B 3 B 5 3 Instruction Code B 4 B 5 4 Instruction Code Qualifier B 4 B 5 5 Message Arguments B 5 B 5 6 End...

Страница 11: ...FRONT AND BACK PANELS 4 2 FIGURE 6 1 PRINCIPLE MENU TREE 6 3 FIGURE A 1 BER VITERBI DECODING A 4 Tables TABLE 4 1 FRONT PANEL LED INDICATORS 4 2 TABLE 5 1 25 PIN D TYPE FEMALE 5 1 TABLE 5 2 ALARMS CON...

Страница 12: ...or moderate injury CAUTION may also be used to indicate other unsafe practices or risks of property damage WARNING WARNING indicates a potentially hazardous situation that if not avoided could result...

Страница 13: ...ody of the IEC power inlet connector behind a small plastic flap For 230 volt AC operation use T0 5A 20mm fuses For 115 volt AC operation use T1A fuses 20mm fuses FOR CONTINUED OPERATOR SAFETY ALWAYS...

Страница 14: ...ted to the Public Telecommunications Network EMC Electromagnetic Compatibility The CDM 500 VSAT Modem has been demonstrated by independent testing to comply with the following standards Emissions EN 5...

Страница 15: ...her warranty is expressed or implied Comtech EFData specifically disclaims the implied warranties of merchantability and fitness for particular purpose Exclusive Remedies The remedies provided herein...

Страница 16: ...inches deep and consumes only 18 watts It has a front panel VFD display and keypad for local configuration and control although it can be fully remote controlled For 1 1 applications the CDM 500 is su...

Страница 17: ...who has traditionally had to offer both options The CDM 500 eliminates this problem by offering both impedances in the same unit The user simply selects from the front panel which impedance he wishes...

Страница 18: ...damage report Be sure to keep all shipping materials for the carrier s inspection If the unit needs to be returned to Comtech EFData please use the original shipping container 2 1 Mounting If the CDM...

Страница 19: ...details on how to fully configure the unit for the desired operating parameters The auto sensing AC power supply does not require any adjustments Simply plug in the supplied line cord and turn on the...

Страница 20: ...scrambled and then convolutionally encoded Following the encoder the data is fed to the transmit digital filters which perform spectral shaping on the data signals The resultant I and Q signals are th...

Страница 21: ...Following this the data passes to the Plesiochronous Doppler buffer which has a programmable size or may be bypassed From here the receive clock and data signals are routed to the terrestrial interfa...

Страница 22: ...uorescent Display VFD is an active display showing 2 lines each of 24 characters It produces a pleasing blue light the brightness of which can be controlled by the user It has greatly superior viewing...

Страница 23: ...is On Line and carrying traffic On line Off The Unit is Off Line standby forced by externally connected 1 1 or 1 N redundancy system Orange There is a Stored Event in the log which can be viewed from...

Страница 24: ...is provided in the next section Note that currently selected interface type is indicated by a small orange LED which is located immediately above the connector This provides aa easy visual indication...

Страница 25: ...Physical Description CDM 500 Closed Network Satellite Modem 4 4 Rev 1 3 This page is intentionally blank...

Страница 26: ...RR A RLSD CF 109 9 Receive Clock B Modem to DTE RT B SCR B 115 10 Receiver Ready B Modem to DTE RR B 109 11 Transmit Clock B DTE to Modem TT B SCTE B 113 12 Internal Transmit Clock B Modem to DTE ST...

Страница 27: ...Type Male Table 5 2 Alarms Connector Pin Description 1 Ground 5 Unit Fault Relay Normally Open 12 Unit Fault Relay Normally Closed 4 Unit Fault Relay Common 8 Receive Traffic Relay Normally Open 15 Re...

Страница 28: ...cription 1 Ground 5 Ground 9 RS485 Transmit Data A 8 RS485 Transmit Data B 7 RS485 Receive Data A 6 RS485 Receive Data B 2 RS232 Transmit Data 3 RS232 Receive Data 4 Reserved do not connect to this pi...

Страница 29: ...Connector Pinouts CDM 500 Closed Network Satellite Modem 5 4 Rev 1 3 This page has been intentionally left blank...

Страница 30: ...solid block cursor would obscure the item being edited for example a numeric field the cursor will automatically change to an underline cursor If the user were to display the same screen for weeks at...

Страница 31: ...meric field this will decrement the value ENTER ENT Used to accept an edited entry Most menus prompt the user to press this key by displaying the text PRESS ENTER ENTER or ENT This results in the entr...

Страница 32: ...CDM 500 Closed Network Satellite Modem Front Panel Operation Rev 1 3 6 3 6 2 Menu Trees Figure 2 shows the menu structure of the CDM 500 Figure 6 1 Principle Menu Tree...

Страница 33: ...opbacks for example INFO Information This menu branch permits the user to view information on the unit without having to go into configuration screens MONIT Monitor This menu branch permits the user t...

Страница 34: ...d over the satellite so that M C information may be passed to the distant end INTFC Interface This menu sub branch permits the user to define which electrical interface type is active at the data conn...

Страница 35: ...cting the digit to be edited using the LEFT RIGHT arrow keys Change the value of the digit using the UP DOWN arrow keys Press ENTER The overall range of data rates is from 2 4 to 512 kbps NOTE The min...

Страница 36: ...icates that the CDM 500 will supply a clock to the DTE which is derived from its internal high stability source EXTERNAL indicates that the CDM 500 expects to receive a clock from the DTE to which the...

Страница 37: ...g the UP DOWN arrow keys Press Enter The range of frequencies is from 52 88 MHz 70 MHz factory option or 104 176 MHz 140 MHz factory option 6 5 14 CONFIG RX DATA Data Rate EDIT RX DATA RATE 64 000 kbp...

Страница 38: ...er When Transparent mode is selected a V 35 descrambler is used In Framed mode a frame synchronised descrambler is used It is recommended that scrambling descrambling be used at all times 6 5 18 CONFI...

Страница 39: ...r Note that in BPSK mode the demodulator will automatically synchronize to either the normal time ordering of bits FEC codeword pairs or the inverted ordering used by certain other manufacturers 6 5 2...

Страница 40: ...which passes messages via the overhead to a distant end modem An EDMAC SLAVE is a unit which is not local to the M C computer which is at the distant end of a satellite link If MASTER is selected the...

Страница 41: ...s the equivalent of putting the unit into Remote Control mode no local control is possible 6 5 28 CONFIG INTFC Interface Select RS422 EIA 530 V 35 or RS232 synchronous using the LEFT RIGHT arrow keys...

Страница 42: ...rrow keys then press Enter At this point the user will be further prompted to enter the bus address In RS232 mode the bus address is fixed at 0 and the following screen will be displayed 6 5 34 CONFIG...

Страница 43: ...CTIVE or MASKED using the LEFT RIGHT arrow keys then press Enter If the user selects ACTIVE then a Receive Traffic fault will be generated whenever the demodulator determines that the Eb No of the rec...

Страница 44: ...ASK TX AIS SEL TX AIS ALARM MASK ACTIVE MASKED PRESS ENT Select ACTIVE or MASKED using the LEFT RIGHT arrow keys then press Enter If the user selects ACTIVE then a Transmit Traffic fault will be gener...

Страница 45: ...e Modulator IF LOOP IF Loopback This test mode invokes an internal IF loop This is a particularly useful feature as it permits the user to perform a quick diagnostic test without having to disturb ext...

Страница 46: ...cuit ID string which is entered via the UTIL ID screen To return to the previous menu then press Enter 6 7 2 INFO TX Transmit information Tx 140 0000M 512 000k F Q R1 2 S LOP 20 0 ON I The information...

Страница 47: ...ize Press Enter to return to the previous menu 6 7 5 INFO EDMAC Framing and EDMAC information FRAMING ON EDMAC MODE ON SLAVE This screen shows the framing mode EDMAC mode and shows if the unit is an E...

Страница 48: ...hows the status of the serial link between the two units Redundancy status either online or standby 1 1 or 1 N IMPORTANT NOTE If the asterix shown in the top right is present this means that the hardw...

Страница 49: ...MON ALARMS UNIT Unit alarms UNIT FAULT 12 VOLT PSU IS UNDER VOLTAGE The screen will indicate if there are any Unit Faults If not it will display NONE Press Enter to return to the previous menu 6 8 3...

Страница 50: ...he UP DOWN arrow keys Press ENTER or CLEAR to return to the previous menu The event log can store up to 100 events When a fault condition occurs it is time stamped and put into the log Similarly when...

Страница 51: ...ceived carrier in kHz with a displayed resolution of 100 Hz BER This is an estimate of the corrected BER This figure is derived from an accurate measurement of the uncorrected error rate from the Vite...

Страница 52: ...n to using the UP DOWN arrow keys then press Enter Locations 1 through 10 are available If the selected location does not contain a previously stored configuration the following screen is displayed YO...

Страница 53: ...10 are available If the selected location contains valid data the following screen will be displayed THE NEW CONFIGURATION HAS BEEN LOADED ENTER Press ENTER or CLEAR to return to the previous menu If...

Страница 54: ...EFT RIGHT arrow keys Change the value of the digit using the UP DOWN arrow keys Note that in accordance with international convention the date is shown in DAY MONTH YEAR format Press Enter 6 10 2 UTIL...

Страница 55: ...TEST MESSAGE Edit the Circuit ID string using the LEFT RIGHT and UP DOWN arrow keys Only the bottom line is available 24 characters The cursor selects the position on the bottom line LEFT RIGHT and t...

Страница 56: ...the DCE supplies the clock to the DTE The EIA 422 449 name for this signal is Send Timing or ST The DTE then clocks from this source and gives the modem transmit data Send Data or SD synchronous with...

Страница 57: ...ceive clocking modes in the CDM 500 7 2 1 Buffer Disabled When the buffer is disabled the receive clock Receive Timing or RT is derived directly from the demodulator and hence will be subject to plesi...

Страница 58: ...to find and lock to the start of frame At regular intervals throughout the frame additional data bytes and flag bits are added a further 36 bits in total It is these additional bytes which convey the...

Страница 59: ...ntent only the address will identify it as being for a distant end unit Before the M C data can be successfully transmitted and received pairs of units must be split into EDMAC Masters and EDMAC Slave...

Страница 60: ...nd unit Designate a Master Slave pair Master at the local end Slave at the distant end On the local end unit enable framing and EDMAC define the unit as MASTER then enter the bus address of the SLAVE...

Страница 61: ...EDMAC Channel CDM 500 Closed Network Satellite Modem 8 4 Rev 1 3 This page has been intentionally left blank...

Страница 62: ...ynomials BPSK Rate 1 2 QPSK Rate 1 2 Rate 3 4 and Rate 7 8 Transmit filtering 6th order Butterworth aperture and group delay equalised per INTELSAT IESS 308 32 to 256 tap FIR digital filter implementa...

Страница 63: ...kbps R1 2 QPSK 30kHz acquisition sweep range 6dB Eb No 5 seconds average at 16 kbps R1 2 QPSK 5kHz acquisition range 6dB Eb No 21 seconds average at 8 2 kbps R7 8 QPSK 2kHz acquisition sweep range 6d...

Страница 64: ...al IF digital and near far Fault relays Hardware fault Rx and Tx Traffic Alarms M C Interface RS232 and RS485 addressable multidrop RS485 may be either 2 wire or 4 wire M C Software EDMAC software for...

Страница 65: ...Spec Summary CDM 500 Closed Network Satellite Modem A 4 Rev 1 3 Figure A 1 BER Viterbi Decoding...

Страница 66: ...B 2 EIA 485 For applications where multiple devices are to be monitored and controlled a full duplex or 4 wire plus ground EIA 485 is preferred Half duplex 2 wire plus ground EIA 485 is possible but i...

Страница 67: ...directly to the target via a two wire plus ground connection Controller to target data is carried via EIA 232 electrical levels on one conductor and target to controller data is carried in the other d...

Страница 68: ...code 61 33 or 42 1 character From 0 to n characters CarriageReturn Line Feed ASCII code 13 10 2 characters Example 0654 RSW 32 CR LF Each of the components of the packet is now explained B 5 1 Start...

Страница 69: ...to target is used as the assignment operator and is used to indicate that the parameter defined by the preceding byte should be set to the value of the argument s which follow it For example in a mes...

Страница 70: ...ion to set a parameter to a particular value then if the value sent in the argument is valid BUT the modem will not permit that particular parameter to be changed at that time the target will acknowle...

Страница 71: ...Remote Control CDM 500 Closed Network Satellite Modem B 6 Rev 1 3 This page is intentionally blank...

Страница 72: ...tion 1 bps Example TDR 511 999 which is 511 999 kbps TDR message ok TDR received ok but invalid arguments found TFQ message ok but not permitted in current mode TDR TDR xxx xxx same format as command...

Страница 73: ...TCK 2 which is External Clock TCK message ok TCK received ok but invalid argument found TCK message ok but not permitted in current mode TCK TCK x same format as command argument Tx Carrier On Off Sta...

Страница 74: ...nd or Query Rx Spectrum Invert selection where 0 Normal 1 Rx Spectrum Inverted All other codes invalid RSI message ok RSI received ok but invalid argument found RSI message ok but not permitted in cur...

Страница 75: ...Terrestrial interface type where 1 RS422 EIA530 DCE 2 V 35 DCE 3 RS232 sync All other codes invalid Example ITF 2 V 35 ITF message ok ITF received ok but invalid args found ITF message ok but argument...

Страница 76: ...er multiples of ten are permitted 0010 0020 0030 0040 etc Example ESA 0890 Important Note Setting the value of the EDMAC Slave Address to 0000 disables this function Setting a valid address here will...

Страница 77: ...as TPL 4 bytes C Tx Clock Source same as TCK 1 byte X Tx Carrier Status same as TXO 1 byte f Rx Frequency same as RFQ 8 bytes d Rx Data Rate same as RDR 7 bytes r Rx FEC Code Rate same as RCR 1 byte m...

Страница 78: ...erical 0 to 9 Command only Forces the unit to retrieve the Configuration Memory location defined by the one byte argument 0 to 9 and to re program the unit with that stored configuration CLD message o...

Страница 79: ...mode N A N A Read EEPROM Value N A 3 bytes Query only FACTORY USE ONLY A query in the form aaa where aaa is a starting bit address in the range 0 127 within the modem s serial EEPROM requesting that...

Страница 80: ...s with RNE If there are less than 5 events to be retrieved the remaining positions are padded with zeros N A RNE RNE CR AB C mmddyyhhm mss CR ABCm mddyyhhmms s CR ABCmm ddyyhhmmss CR ABCmmdd yyhhmmss...

Страница 81: ...d into standby by 1 N or 1 1 Switch 1 On Line normal All other codes invalid Example RED 1 On Line N A RED RED x see description for details of arguments Local Remote Status N A 1 byte value of 0 or 1...

Страница 82: ...status b Tx Traffic status c Rx Traffic Status d Change in Fault Status since last poll 0 none 1 change e Change in Unit Configuration since last poll 0 none 1 change Unit faults 0 No faults 1 Power...

Страница 83: ...Remote Control CDM 500 Closed Network Satellite Modem B 18 Rev 1 3 This page has been intentionally left blank...

Страница 84: ...K TX AIS 6 18 CONFIG RX ACQ 6 10 CONFIG RX DATA Data Rate 6 9 CONFIG RX DESCRAM 6 10 CONFIG RX FEC 6 9 CONFIG RX FRQ Frequency 6 9 CONFIG RX MOD Modulation 6 8 CONFIG RX BUF Buffer size 6 11 CONFIG RX...

Страница 85: ...r A 1 MON ALARMS RECEIVE 6 23 MON ALARMS TRANSMIT 6 23 MON ALARMS UNIT Unit alarms 6 23 MON EVENTS VIEW 6 24 MONIT Monitor 6 22 MONIT ALARMS 6 23 MONIT STORED EVENTS 6 24 Mounting 2 1 O Opening Screen...

Страница 86: ...103 1 609 x 103 1 609 1 mm 0 03937 1 kilometer 0 621 Temperature Conversions Units of Weight Unit Gram Ounce Avoirdupois Ounce Troy Pound Avoir Pound Troy Kilogram 1 gram 0 03527 0 03215 0 002205 0 0...

Страница 87: ......

Страница 88: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...

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