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INSTALLATION & SET-UP

  9

3. 2 LV2000 Crypto Resynch Operation

When operating with a serial encryption unit, it is possible that the decryption function will 
lose synchronisation, with the result that the data being received by the LV2000 unit is 
invalid. When synchronisation is lost, it is useful for the LV2000 to be able to detect this and 
automatically  take action to resynchronise and restore the data link.

The LV2000 uses HDLC encapsulation for the serial data link and uses this protocol to detect 
synchronisation loss. HDLC uses a checksum to validate all frames and the LV2000 will 
declare loss of synch if 10 consecutive frames are received containing errors.

Providing that Crypto resynch function is ENABLED, when the LV2000 finds that it has lost 
synch it will pulse the RS output signal for half a second before then restoring it to its normal 
state. It will then wait for 5 seconds to allow the crypto to perform its initialisation and 
synchronisation functions before checking for synch again. If the link is still out of synch, the 
process will repeat with another RS pulse.

To ensure maximum flexibility, the state of the RS pulse can be set to either High or Low to 
initiate Resynch action. When Crypto resynch is DIASABLED, the RS output will assume the 
normal High (ON) state.

In addition, in order to support the widest range of Crypto equipment, the RS signal may be 
set to be driven as either Differential LVDS, or as a single ended LVTTL signal.

3. 3  Connecting up
Safety Notice: 

Ports that are identified as SELV in this manual should only be connected to 

SELV ports on other equipment in accordance with EN 60950 clause 2.3.

Step 1: Mounting

.

The LV2000 is housed in a convenient 1U table top enclosure.  19 inch  rack nests for two 
or 18 units are available as options.

Step 2: Set up Bit-switches 

These switches are located on the base of the unit and are used to configure the unit.

Step 3: Power Supply

Finally, connect the main power lead and re-check all connections for security. Then turn on 
the power supply. 

Warning: 

Do not connect the LV2000 to excessive voltage. Read the safety information 

before continuing.

Step 4: LAN ports

Connect the LV2000 to the RJ45 LAN port on the rear panel. The indicator lights on the lower 
corners of the RJ45 socket indicate the LAN speed and activity status.

Step 5: LVDS port

Connect the satellite modem to the EIA-644 LVDS port using an appropriate cable type for 
the satellite modem interface. The DTE activity LED on the rear panel will indicate the link 
status.

Содержание 80-05-558

Страница 1: ...Way Egham Surrey TW20 8RY United Kingdom tel 44 0 1784 744700 fax 44 0 1784 744730 email sales metrodata co uk Part No 76 02 063B website www metrodata co uk Metrodata LV2000 Ethernet LAN to EIA 644 L...

Страница 2: ...to the LAN port If the FCS is incorrect the packet is discarded The LV2000 has an auto negotiating 10 100BaseT Ethernet port and an EIA 644 LVDS DTE port for LVDS connection mounted on the rear panel...

Страница 3: ...compliance all signal and data cables and connectors must use a screened connector shell with a screened cable The cable screen must be terminated to the screened connector shell and not connected to...

Страница 4: ...red using leaded solder 1 7 Power Supply The LV2000 is powered by an internal mains fed power supply The input voltage is 100 250VAC 50 60Hz with an input current of 50 mA An alternative unit fitted w...

Страница 5: ...ed unit is available The input voltage and current ranges are minus 36 to minus 72 volts DC 200 100mA A Buccaneer type socket is fitted to the rear panel and a plug is provided with the unit for the c...

Страница 6: ...riven LVDS or LVTTL outputs Pin Direction Signal name 1 2 SD A Send Data A 3 RD A Receive Data A 4 RS A Request to Send A 5 6 7 Ground Signal Ground 8 RR A Receiver Ready A 9 RT B Receive Timing B 10...

Страница 7: ...tly selects half duplex operation Such operation is prone to errors and should be avoided by setting AUTONEGOTIATION to DISABLED and manually selecting the correct SPEED and DUPLEX mode of operation u...

Страница 8: ...ONVERTER AC LV2000 For product manual and other information Metrodata Ltd TW20 8RY UK Tel 44 0 1784 744700 Fax 44 0 1784 744730 17 08 637A Part No 80 05 558 OFF ON www metrodata co uk Manufactured in...

Страница 9: ...esynch control will be single ended LVTTL 3 1 5 Data Invert Bit switch ON Normal operation Bit switch OFF The data is inverted 3 1 6 Duplex Bit switch ON LAN port operates Half Duplex in manual mode i...

Страница 10: ...o either High or Low to initiate Resynch action When Crypto resynch is DIASABLED the RS output will assume the normal High ON state In addition in order to support the widest range of Crypto equipment...

Страница 11: ...adaptor plate using the screws that you have removed as shown in the illustrations below Then secure the rack mounting plate complete with the two LV2000 units to the 19 rack using the locating holes...

Страница 12: ...then there is a LAN connection If the LED remains unlit there is no LAN connection and investigatory action should be taken on the LAN and or its cables Note that for 100M Full Duplex operation betwee...

Страница 13: ...options LVDS port DCE supplied clock Line Rate LVDS 52Mbps Max packet rate 93913 64 byte packets per second full duplex at 52 Mbps LED Indicators DTE Tx and Rx Activity LAN Speed Activity Alarms Loopb...

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