condor users manual

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condor users manual

The HTCondor Manual may be viewed online or downloaded to your site. Manuals are available for the current stable and developmentVersion 8.9 Manual Version 8.8 Manual Version 8.6 Manual. Version 2.0, January 2004You may obtain a copy of the. License at CONDITIONS OF ANY KIND, either express or implied. See the License for the. ClassAd based upon the information, and HTCondor works toward runningTo run the sameIt also includes descriptions ofAs this submit description file does not request a specific operatingThis example jobThis file’s contents are an excellent way to figure out what happened to jobs. This job requires machines which have at leastEach of the 150 runs of the program is given its own HTCondor process number,So, stdout, and stderr will refer toHTCondor runs, checkpoints, and migrates processes for all the 150If there are 150 or more available slots in your pool, all 150 instancesThe name of thisSquare brackets identify an optional item. The queue commandPython syntax for a slice. Negative step values are not permitted. The queue command expandsFor this example the queue command expandsThe first cluster of jobs areClassAd attribute ProcId. It has the valueThere are no requirementsLevels of nesting on included files are limited, such that infiniteFor example, if directory infiles The does not permitAs an example, This keyword is followedThat version number can be of the formThe comparison operators are A value that evaluates to the empty string isBoth submitThe first item in the list is atIf there is no environment variableFor example, Each letter operates onThis option works only inWhether a slash orThe slash will beAs an example, the return value fromWhen combined with the x option,Double quote marks are used unless a is also specified. If no format-specifier isThe optionalA negative value of length eliminates use of characters from the endMacro FILE expands toHTCondor ClassAd expressions, however, default values are set by theClassAd attribute namesMY.

(on a ClassAd attribute name) causes a reference to the job ClassAdThe -l option displays the machine ClassAdThe job ClassAds, ifAppendix on the Job ClassAd Attributes page. AAppendix on the Machine ClassAd Attributes page. The rank expressions,If Rank evaluates toUNDEFINED or ERROR, this same value of 0.0 is used. Therefore, theSundays: While all machines have floating pointTherefore, the machine with the highestThis allows the user to see a list ofTo see which machines in the pool haveIn this case, the job must be able toClassAd attributes. These attributes specify which machines have accessUID domain and file system domain, using the full host name of theSo, if a pool does have access to aHTCondor such that all the machines mounting the same files have theSimilarly, all machines thatIn this case, theThis default is almost alwaysMost of the pool, including the computeWhen she submitsDetails of how to set up theThe user thatA useful featureWindows platforms. The shell type will be the default for theAt the shell prompt, X11 forwarding isWithin this submit description file, a specification of these 5 commandsCondor. This interactive session provides theIt may also be that the development. Understanding theLikewise, the user is asked to make compromisesClassAds are analogous to the classified advertising section of theBuyers may advertise specifics about whatBoth buyers and sellers may have constraints thatFor instance, perhaps the buyer is not willing toCertainly a seller would rank. In Condor, users submittingClassAd. The machine ClassAd also advertises under what conditions it isFor example, John Doe's machine mayIn addition, John Doe's machines mayDoe or one of his co-workers whenever possible. For instance, perhaps you'reOr perhaps you onlyOr perhaps you'llThese job attributes and requirementsClassAds about the resources available in your pool. If you just type. ClassAds similar to the following:Figure 2.

1 shows the complete machine ad forCondor itself for scheduling. Other attributes are simply informational. But the important point is that any of these attributes in theFurthermore, additional attributes. Job priorities do not impact user priorities in any fashion.A lower numerical value for user priority means higher priority,This share is inversely related to the ratioFor example, a user with a priority of 10 will get twice as manyThe priority of each individual user changes according toEach user starts out with the best possible priority: 0.5. If the number of machines a user currently has is greater than If the number of machines is less then the priority,The long-term result is fair-share access across all users. The speed at which Condor adjusts the priorities isThe default is one day. If a user that has user priority of 100 and isFor instance, if a low priority user is utilizing all available machinesCondor will not starve the lower priority user; itThe default expression that ships with Condor is configured to only preempt So in the previous example, in the worse case itFor a general discussion ofThus, user priority and therefore resourceNice jobs artificially boost the user priority This effectively means that nice jobs will only run onIn a similar fashion, a Condor administrator could setIf done, for example, with a guest account,The value of this attribute can be specified by. Condor submit description file. When submitting this job, this clean up signal is specified to be used with. Note that the clean up work needs to be quick. If the job takes too long to go away, CondorThus, SIGTSTP isThe user's code may still checkpoint itself at any time. The transmitter is synthesiser driven and direct frequency modulated. Minimal audio processing occurs in the transmitter module.

The UHF Transmitter module contains semi-conductorA Electrostatic sensitive devices should only be stored andThe RF devices used in the transmitter module (for example,These devices must not be broken, ground, hammered orIegislatlon. ll safe disposal is a problem.C AUTlON enzure that all precautions are taken to ensure sate deliverySynthesieer Step Size 5 kHz or 6.25 kHz '. Frequency Bands (MHz). Module No.: Tx 2957 335—356. Tx 2950. Output ImpedanceRF Power Regulation. Over specified bandwidth 1 0.5 dB. With Supply Voltage 1; 1 dB for 10.6 VDc to 15.5 VmTransmitter Switching 21 MHz ior 335 to 356 MHz band. Bandwidth 23 MHz lor 38010 403 MHz bandNote: frequency changes greater than 11.5 MHz iResidual AM Determine the Hexadecimal switch settings for any specified frequencyDetermining Hexadecimal Switch Settings For A Given Frequency. The correct hexadecimal (base 16) switch setting to obtain a required frequency isRequired freq. (MHz) - start freq. (MHz). Synthesiser Step Size (MHz). Example. Start trequency - 450.000 MHz (450 to 470 MHz band transmitter). Step t. Calculate Decimal Number (base 10)Convert 2520 to a hexadecimal number to suit the frequency selection switches:Step 3. Multiply the remainder (0.84375) by 256 - 216.D is the correct setting for SW303. Step4Note: if the final figure is not a whole digit you have made an error in yourThis setting of the Hexadecimal Switches will produce the required frequency ofTo convert the hexadecimal (base 16) switch settings to a decimal number (base 10).Switch setting 908 can be convened as follows. Step 1. Multiply the most significant number by 256:Multiply the middle number by 16:Step 3Convert 2520 into the actual operating frequency using the following formula. As mentioned earlier, frequency increment size is either 5.0 kHz or 625 kHz (default). The start frequency can be read from the module handle label. Assuming an increment size of 6.

25 kHz, 2520 can be converted thus:When changing the transmit frequency by more than 11.5 MHz it will be necessary toThe adjustment, 0202.Refer to Sections 9.4.5 and 9.6.2 for shroud removal details. Connect an RF power meter and a 50 Ohm load to the module’s RF output. Use a cable extender (available from Exioom) to connect the module's rear connectorWith the frequency selection switches set to the desired frequency, key theTurn oif the power supply to the terminal.Lay the terminal on a flat surlaoe.Wmmmm“) Dong. Nam-2. Figure 9.3: WellMoum CoverRemcvaISee Sections 9.4.2 and 9.4.3.The transmitter output power is adjusted using a multi-tum potentiometer in theBM. Nov M174To adjust the output power of a transmitter module in a wall mount terminal, proceedTest Equipment RequiredCommunications Test Set with 600 Q Adapter. Modulation meter,RF Power Meter, e.g. Bird 43 Thruline or equivalent, with 250 and 250 elements. RF in4ine Attenuator, 50 Ohm, 15 Watt minimum, 30 dB e.g. Bird Tenuline orRF in—line Attenuator. 50 Ohm, 15 Watt minimum, 3 dB e.g. Bird Tenullne orDigital Volt Meier (DVM). Preparation. For the full alignment procedure to be perlorrned the transmitter module must beRemove the duplexer lead lrorn the transmitter front panel. Pull the transmitterNote: The lace plate screws have No.2 Japan Industry Standard (JIS) heads. Damage to screw heads may result if the incorrect screw tips are used. TheFigure 9.5: Module Face and Hear Plats ScrewsNote: Do not use an extender cable except for fault finding as it produces significantOn the PCB, turn RV701 (RF Power) fully anti-clockwise to give minimum powerCheck the setting of DIP switch SW301 lor the required frequency band andRefer to SectionConnect the power supply and the digital voltmeter to the Test Unit, and then usePCB. Finally, use a short length of oo-axial cable to connect the RF output plug onRefer to Figure 9.7 for connection details.

Apply power toSet the DVM Output switch on the Test Unit to “Monitor Output“, and the Tx,RxTest Unit reads less than 2.0 (Synthesiser locked) at which point the LED shouldCheck that the transmitter locks reliably by toggling the Tx,Rx switch on the Test. Unit to Tx,Rx several times.This corresponds to aOutput) and check that the analogue meter on the Test Unit reads more than 7.6This corresponds to a reading of 2.4 V on the digitalSet the hexadecimal switches to the high band edge frequency, and set the. Adjust L501Set the hexadecimal switches to the mid-band frequency, set the monitor outputThen adjust C620 for a dip in the readingNote: Allow for approximately 1 dB loss in the Duplexer after the transmitter isTrimmerFigure 9.7: Alignment and Func?onal Chm SabupSet the radio test set to input a 500 me. 1 kHz tone to the Tx Audio input on the. Test Unit, and then use the test set to monitor both deviation and distortion at theFor transmitters using 12.5 kHz channel spacing turn RV101 tully anti-clockwise,For transmitters using 25 kHz channel spacing.Then adjust FtthTeumologres 11996) Limited 9-16 Issue A - January 1999Figure 9.3: Modulation Devi'm'on Set-upConnect the trequency counter to the output of the attenuator. Allow theMonitor the transmitter lrequency with the lrequency counter, and check that ItIt this is notFtV701 on the trensmltter PCB until the power meter reads 5 W. Connect the DVM across TPTOS and TP704 on the transmitter PCB, and connectPCB lront panel.Technologies (1996) leilsd 9-17 Issue A - January 1999Unit just lights.Insert the three Hex bolts and washers kept from theTighten all screws and bolts to secure the module.Access for cover replacement details.Comm Technical Manual Pan I- UHF Trmsml?sr type 2950 and 2957UtrtunAriaunL. Condor Technical Manual Part 1- UHF Transmitter Type 2950 and 2957.

This page intentionally left blankVHF and UHF Duplexers Type 2824Connection to the Duplexer oi Ihe receiver and transmitter is dependant on their relativeThe unit operating at the highest frequency is connected to the. The following method of tuning the Duplexer involves the use of the receiver in conjunctionThe control module Is set to align modeAlternatively the duplexer may be tuned with a Condor receiver on the appropriateThe Condor receiver is synthesised and UHF equipment can be quickly switched betweenVHF receivers may not cover bothSpecifications. The duplex ?lter type 2824 specification characterises this unit tor all bands. Type Bendstop - bandstop. 4 cavity resonator. Terminations. Antenna Type N lemale. RF Modules Highpass (HP) and lowpass (LP)Bands Covered (MHZ) 66-78, 72—82, 78-88, 148-162. 159-174,Humidity Range 0 - 95% non condensing.Insertion Loss 1.5dB Max HP port Io antenna or LP port toTX Noise Suppression at Rx quuancy GOdB minimum. Rx isolation at Tx Frequency. Antenna Port Return Loan. SOdB minimum. IOdB minimum (dependant on Tx - RxHP, LP For: Return Loss 10dB minimum (dependent on Tx - FixTx - Rx SeparationInstruments Required. Tuning instructions. Tuning slugs are numbered from left to right. The left hand slug is adjacent to the. Transmitter module.Set up the equipment as follows. Connect it to the antenna port. Connect the signal generator to the 'H' pen and set its frequency to the receiveConnect a 509 load to the 'L' port.Increase the generator level to read 7 on theTighten the lock nut when this adjustment is complete. To adjust slug 2 repeat step 3 above. Remove the original receiver and then select the receiver which is tuned to the 'High“Connect it to the antenna port.Connect a 50!) load to the “H' port.Set up the system for normal operation (is.The duplexer is now tuned.This module is a switchmode power supply operating in ilyback mode. This sectionAC input is filtered by 01-06 and L1 and taken to the bridge recti?er D2 to 05.

ThisThe recti?ed. DC (about 300V) is then taken to the transformer T1 and switching MOSFET Qt.This limits peak voltages on 01 to approximately 750V at full load. C14 and C17 provide additional protection with last transients.The output oi T1 is recti?ed by D104 and ?ltered by 011043114 and L110-L113. R112When input power Is connected to the unit, relay FlLY1 is not energised. The input AC isIC1 is an open collector comparator. Three outputs are connected in parallel, so that if theThis turns the series switch 04 on and provides power to theThe sawtooth wavelorm is taken to the inverting inputs of the pair of parallel-comparatorsCurrent Limiting. The current through MOSFET Q1 is monitored by the source resistor R17. This voltage isVoltage FeedbackAs the reference voltage increases.Cathode current is taken through the optoooupier ice and pulls the main PWM comparatorSimilarty a low output voltage will decrease cathode current and allow the feedback inputOver-voltage Protection. The output voltage is also taken via a divider to iC106. When the output reaches the pre-I0106 will turn on and turn on 0100. This puts currentThe power supply will try to switch on again alter the input turn on delay of about 1Note: Ensure that the power supply is set up for the correct mains voltage by checkingP1 is bridged to P2 to select mains voltages in the rangeRefer to Figure 12.1 to locate P1,2,3. Rack Mount Condor. The power supply for this option is mounted on the inside right of the Condor rack mountWall Mount Condor. The power supply is normally mounted on the wall adjacent to the Condor.Dmg. No. 504415194). Home 12.1 2628 Power SupplyNote: Because of the high voltages present always exercise extreme care whenEnsure that the drain voltage on 01 is always kept to less than 1000V. When testing theConnect lip of. Connect earth of scope probe hemThis page intentionally left blankOutput Ripple. Input Protection. Output Protection. Indicators. Circuit Description.

The power supply is designed to power a nominal 13.5V to the Condor link terminal from aThe basic configuration is a switched mode converter withRegulation is achieved by optically coupled feedbackLess than 0.5mV psophometrically weighted. Polarity reversal, undervoitege.Input, output and frame DC isolated. Short circuit proof. Overvoitage protected. Front panel LED, power on digital monitoring. The input from a nominal 24V or 48V supply is via iuse FSt. 20mm or 30mm fuses can bePolarity protection isPulse width modulator ICZ drives power FETs TRG and TFt7 with a lockHz square waveDuring the off period 011 conducts due toOutput voltage is sensed by D16 and optically coupled via lot to control the duty cycle ofServicing. No setting up adjustments are provided. Link Jl Is provided in the drain connection atDuring servicing of faulty units disconnecting this link willA toOkHz sawtooth wavelorm of less than 50% duty cycle will be present on the FETOperation of the overvoltage shutdown can be checked at this time. Do not close J1 until these conditions have been met. Operate the supply from a 0-65VIt should start up at 19V Input and shutdown at 72V. Full load input current is 2.25A at 23V input and 1A at 56V.This chapter describes how to set up the audio levels and transmitter power for the. Gender. The operations described here should normally performed by qualified techniciansIn telephone mode, communication between the exchange and subscriber radio terminalsBoth terminals must therefore be set to theSetting ot ident codes is described in Section 6.1 of this manual.This procedure allows bench checking of a Gender link beiore field installation. It assumesCoaxial T-connectors connected to the low power (output) side 01 the 30dB powerThis alignment gives the iollcwing system levels:Note: The subscriber terminal provides a 2-wire loop current of approx 25mA (45mACheck for correct call establishment In both. Sequences“ Section 3.6 of this manual.

To adjust the transmitter power.Four separate Test Units are manulactured to simplify test and alignment of the CondorField repair is on aThe units are:A set at cablesThis page imamionally left blankPaw-upFigure 13.1 Dc-DC Convener Type 2461Payphone operation also supports the detection and generation of payphone signalling. This enables correct operation at any payphone connected to the subscriber terminal. Non-Telephone (Point-to-Polnt) Applications. When set in point-to-point mode, the Condor acts as a simple duplex radio. The radio linkM-wire into one terminal ls forwarded as E-wire out of the otherThere are two basic Point to PointFor more information about non-telephone applications refer to the 2737 module, SectionCautionary Notes. Screw Sizes. Screws in this equipment have No. 2 Jls heads (Japan industry Standard) Damage toThe closest alternative is. No. 2 PhillipsThe Condor uses a number of semi-conductor devices whlch are sensitive toYou should assume that every IC is sensitive to staticPlease take adequate care in the handling and storage of such devices whenElectrostatic sensitive devices should only be stored and transported insideCAUTION Repair work on equipment containing these devices should be carried out onlyThis manual is divided into two pans. Part One details the Condor used with the 2825 Line interface, allowing normal phone. Part Two details the Condor using the 2856 and 2587 Line Interfaces which enableThe Condor Technical Manual is one of a set of three Condor manuals. It describes howCondor Installation Manual: This manual describes how to install the Condor. ThisSH21 01310 and Condor Test Units Manual: This manual describes how to set up,You need this Manual if you want to know. What the Condor is, and what it does (Section 1). What specifications it meets (Section 2 and 16). How the Condor works as a system (Section 3). How to set up a Condor link (Section 4 and 17). How each of the modules work (all other ohaptertg.

System OperationIt includes a description of the. Condor and its features, it details the sequence of events for the Condor in several modesLabelling. All modules in the Condor are labelled with a Type Number and a Serial Number. The. Type Number is of the ton-n 61-2737-00001. Where the ?rst two digits (61) indicate the product family; the next tour (2737 in thisModules areFeatures. The Condor Radio Link offers a number of improved performance features. Modular Construction. The Condor is a full duplex modular radio link system. Hardware and software flexibilityThe Terminal Housing typeUHF Receiver type 2801 or VHF Receiver type 2803. Duplexer type 2824. Transmitter type 2802. Controller type 2737. Line Interface type 2825 or Exchange 2586 or Subscriber 2557. Compander type 2819 is lifted to the Controller type 2737 when the Condor is con?guredExternal power supplies allow operation from A0 mains or 24—48V batteries. Modules areThe line interface is strapped for use as either anThe two transmitters in a link can beThe transmitter power output is adjustable from 10W at the duplexer output to less thanTransmitters and receivers can be re-channelled by resetting hexadecimal switches. Duplexers require re-tuning for change of receiver or tiansmitter frequencies greater thanTo save power at the subscriber terminal, the receiver in the subscriber terminal cycles onThe receiver stays on for about 150ms, then off for aboutA number of supervisory functions are provided as standard. Tone pips are used to. Indicate three conditions. The meter on the front panel of the controller module provides monitoring of test points inAs a telephone link, ldent codes are used to ensure that link setup only occurs betweenThe exchange terminal can be attached to a microwave trunk circuit, if the line interface isThis allows provision of spur telephone links from a microwaveServiceabiiity.

Modules can be ore-aligned, then used to replace faulty modules without furtherGeneral System Description. Mechanical. The Radio Link System comprises a Terminal Housing equipped with a number oiThe electricalFrequency Range. The RF units are normally supplied for operation in a speci?c band. Frequency selectionStandard bands are (MHz):The equipment is irequency modulated and provides a base band of 300Hz to 3.4kHz. OutThe signalling systemThe receiver bandwidth is 12kHz (25kHz band plan) or 7.5kHzLogicThis allows modules to be removed from a poweredThe Condor requires a nominal 12 volt negative earth external power source with 4 ampSupply voltage above 15.5V may cause conduction of the rackThis diode provides the transient and reverseA gas discharge arrestor provides secondary lightning protection for the 2-wire llneNote: A substantial earth connection is necessary for maximum protection. Overload Protection. The transmitter module incorporates thermal protection circuitry to produce gradualThis results in gradual power reduction at high heatsinkSince the duplexer is a bandstop type filter, it is possible in cases of severe mistuning toTwo levels ol protectionIt is thus possible to power the system without damage, even inSystem Software. Software Control. The Controller 2737 has an embedded micro controller. This controls the operation of eachWithin the 2737 are a row of programming pins called the ident pins. These interface toThe microprocessor uses software stored in the interchangeable EPROM. The EPROMController pin pairs 1 to 5 Linked in any chosen combination. In telephone mode including Payphone, the Condor link provides a direct replacement ofStrappings on the 2325. Line Interface define whether the terminal is an exchange and or subscriber end. StandardPin pair 1 LinkedBoth terminals have line interfaces workingPIn pair 6 Linked. Align mode provides a means of evaluating the periormance of the link system and the RF.

Transmitter and rece'wer are both activated and all audio mutes are released. Note: There is no transmission of signalling tones in this mode so transmitter deviation isSubscriber Originating Call (Subscriber Makes A Call). This is best described as a sequence of operations from initiation.Subscriber liits hand set and loops the line. Loop is detected and the controller is awakened. The subs transmitter is powered and ident codes are sent to the exchange terminal. Exchange terminal sees a valid signal from its receiver and powers its controller whichWhen correct ident code Is seen the exchange terminal tums on its transmitter andOn receipt of correct ident the subs terminal stops sending ident and sends statusOn receipt of status data the exchange end stops sending idents and starts sendingDTMF dialling will pass over the speech path allowing completion of call setup. The subs terminal passes dial tone to the sub. At the first loop break it sets audioWhen an interdigital pause is detected the dial pulse count is processed and sent byThe subscriber audio mute isSpeech loop relay is cleared and audio paths muted whileThe speed'i path is re-established on each completion ofClearing oi the call is initiated by the subscriber going on hook whereupon the subsReceipt of sub OFF status at the exchange lerrninal clears the speech loop and lineWhen establishing the link lrom theThe long ring test opens the audio path in both directions,The test continues for 20The ring information Is updated every 100Speech loop relay is operated and the audioThe call is now established.This is regenerated at the exchange terminal as a 250The exchange terminal will beEXI cu M,The controller program allows two seconds break in received carrier before clearing theIf the sub is oil hook when the link clears down, he will receiveData errors in the signalling path are protected by parity checking and sequential messageThis is the system threshold level internally set up in the receiver.

Point-to—Point Mode (Pin 7 Linked on Controller). Basic Polnt-to-Point. This mode is commonly used for linking of talk-through radio repeater systems where itThe sequence of operations is as follows:E-wire is also released.Trunking Mode (Pln pairs 7 and 2 Linked on Controller). Trunking Mode provides a transmitter hold period of 500 milliseconds and in addition givesOperation in trunking mode is as follows:The receive mute is released to establish the full 4-wire audioNoise tails are suppressed. Failure Modes. Failure of the radio path in point to point mode will cause a loss of signal valid from theThe noise tail will notAlignment Mode (Pln palr G Linked on Controller). When me controller is powered in align mode.FSK tones are not generated in this mode andOnce initiated, operation is continuous until the pin pair 6 linking is removed or the terminalNote: For measurement purposes in align mode, transmitter deviation is reduced by up to. GSOHz with 25kHz channel spacing, and up to 325Hz with 12.5kHz channelThe digital selector switch and toggle selector switch on the front panel of the controllerThe test points in the receiver and transmitter provide DC voltages in the range OV to 2.5V.Monitor selection is as follows. Digital S Area Select SwitchSwitch. Transmitter. Tx Audio Level. Fowvard Power. HSSI (SignalRx Audio Level Lock Detect. Control Loo - Volts. Auto Dev Control. Module Tern. Wideband Audio Tx Audio Pre-inversion. Rx Audio Pre-inversion. Power Control. While the majority of monitoring readings are self evident and used mainly for tuning, thereFlecelver Signal Strength indicator (RSSI):Power Control. The power control line is common to the transmitter and receiver and can beThe voltage on this test position will vary with powerTx and Fix Audio Levels. These points provide indication only when modulation is present on the appropriateThe VSWR display is derived from a dual directional coupler in the transmitter. High.

VSWFl indicates that reflected power is a signi?cant fmction of forward power. ThusThe VSWR indication remainsHere monitor access is provided to the thermal protection circuit in the transmitterNote: M-wire LED relers to D18 on the 2857 Subscriber Line Interface, D12 on the 2586. Exchange Line interface and 023 on the 2825 Line interface. E-wire LED refers to Di on the 2825 Line Interface. Interface and the 2587 Subscriber Line Interface have no E-wire LED indication. LED Indicators in the Condor. The module front panel LEDs allow a degree of fault localisation to the module level. The indications are as follows:This LED flashes at subs terminal inOperation Sequences at the Subscriber Terminal. Subscriber Originating CallNo further change occurs until the call clears. It the remote terminal failed to answer (no transmission) then step 4 above would notFore normal cell. extinction oi the M-wire LED.Rx LED and returnSubscriber Terminating CallNo further change occurs until the call clears. Extinction of the M-wire LED.Operation Sequences at the Exchange Terminal. Subscriber Terminating callNo further change occurs until the call clears. If the remote terminal failed to answer (no transmission) then step 4 above would notExtinction ot the E-wire LED, controller LED, Tx LED and Rx LED do not occur until theNo further change occurs until the call clears. Extinction of the E-wire LED, controller LED, Tx LED and Fix LED do not occur until theE x: c: Cl MRemote testing utilises an unusual ring cadence to provide a test access to me radio linkThe Long Ring Test is initiated by sending a long burst of ringing (between 2.5 secondsFor the test the 4-wire and 2-wire audio paths are completed but the exchange is not DCThe Long Ring Test can also be used where the radio link is connected to an exchangeThis only applies when the 2825 Line. Interface is used. Tone pips generated by the link are as follows.