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5−

31

5.8221 DS1/E1

Receiver

The DS1/E1 receiver regenerates the selected incoming signal and recovers
both the clock and the data. The data go to the framing circuit. The 54591
measures the input DS1/E1 reference bit time phase as compared to the
ovenized crystal oscillator output by means of a digital phase detector.
Samples of phase information are collected and averaged, over about a one-
second time period, to provide input to the control algorithm. If, at any point in
the accumulation and calculation period, a condition is detected (excessive
errors, LOS, OOF, etc.) which causes the collected information to be suspect,
the unit enters the holdover state and does not update the correction to the
oscillator. If the data are qualified, then the update will proceed. After 128
acquire cycles (about 2 minutes) following initial qualification, the clock will be
in the tracking mode. After 5 to 7 minutes, the tracking mode will be at
minimum error if the input is within specifications. The 54591 will track timing
signals from any other Stratum 3/LNC or higher source (i.e., Stratum 2/TNC or
1/PRC) having a frequency offset of no more than ±7.1 Hz.

5.8222 Framer

The 54591 communicates with a CS2180 Transceiver Chip for the T1 inputs or
a CS2181 for the E1 inputs. The framing circuit detects the following framing
errors:

a. Yellow Alarm, LOS (175 ±75 consecutive zeros)

b. BPVs

c. Invalid CRC6 codes (ESF framing only) or CRC4 codes (CRC4 framing

only)

An impaired signal causes the microcontroller to cease tracking, go into the
HOLD mode, and show the type of impairment on the seven segment display.

5.8223 Ovenized Crystal Oscillator

A 10 MHz ovenized crystal oscillator provides the input to a 48-bit DDFS.

5.8224 Direct Digital Frequency Synthesizer

The oscillator is coupled to the DDFS and acts as a reference for it. The
DDFS operates on the presumption that oscillator frequency is kept within a
reasonable degree of precision, e.g. within one part in 10

-9

. The DDFS uses a

digital process to convert the oscillator signal into a signal having a second
related frequency. The DDFS accomplishes this conversion by utilizing a
stored algorithm and a numerical input from the microcontroller.

The DDFS accepts an integer, N, from the microcontroller. The DDFS then
generates a new output frequency 'F out' from 'F osc' according to the
following formula:

(N) (F osc)

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Содержание 54500-16

Страница 1: ...T1 E1 Synchronization Timing System VOLUME 1 System Description This manual applies to the following equipment Model Model 54500 16 54541 2 54500 17 54542 2 54501 1 54550 21 54502 1 54550 22 54505 0 5...

Страница 2: ...CXR Larus Corporation Company Manual 80 100 400 Issue 1 July 2006 www cxrlarus com CXR Larus Corporation 894 Faulstich Court San Jose CA 95112 Tel 408 573 2700 Copyright 2006...

Страница 3: ...2 13 3 Specifications 3 1 3 1 General 3 1 3 2 StarClock 200E Mounting Elements 3 1 3 21 Model 54500 Mounting Shelf 3 1 3 22 Environmental Limitations 3 1 3 3 Cards 3 3 3 31 Model 54511 T1 Input Card...

Страница 4: ...Clock Card 5 62 5 20 ation 54522 and 54523 Cards tratum 1 PRC Track and Stratum 5 81 Functions 5 27 cription tratum 1 PRC Track and Stratum 2 TNC Card ent Card 5 1 5 1 General 5 1 5 2 Backplane 5 1 5...

Страница 5: ...ppendix AA vs AB Architecture A 1 Appendix B System Behavior Phase Alignment AB 1 G 1 um A A Glossary Vol e 1 Figures section topic pa 1 3 tarClock 200E Front Panel Layout 1 8 2 2 k 200E Stratum 2 TNC...

Страница 6: ...t Driver Card 3 77 3 17 Model 54577 5 10 MHz Output Driver Card 3 80 4 1 Clock Auto selection State Diagram 4 3 5 1 StarClock 200E Mounting Shelf Backplane Model 54511 545 5 2 5 3 Model 54513 Input Ca...

Страница 7: ...This page is intentionally left blank...

Страница 8: ...d is intended for use by field support engineers technicians and craft personnel Volume 3 Manual 80 800 400 the Model 54550 Information Management Card TL1 ITL1 User Manual provides a discussion of th...

Страница 9: ...twork Equipment Building System NEBS compatible 19 23 inch 48 2 58 4 cm rack mounting shelf Model 54500 16 for the E1 application or Model 54500 17 for the T1 application The shelves contain backplane...

Страница 10: ...__________________________________________________ CXR Larus 80 100 400 Issue 1 July 2006 1 3 NOTE many of the output cards have twenty outputs each Figure 1 2 StarClock 200E Master Shelf System Block...

Страница 11: ...output with the input and making suitable correction to the frequency synthesizer 1 213 In Stratum 1 T1 or Primary Reference Clock E1 systems the input tracking reference is derived from a set of ces...

Страница 12: ...e in North America AA architecture is used in some international locations 1 218 The StarClock 200E track and hold clock cards have phase alignment circuitry that causes the secondary input track and...

Страница 13: ...ards produce twenty output signals each with the exception of Models 54575 and 54577 1 223 StarClock 200E master shelf can contain auxiliary cards that measure the performance of the system provide in...

Страница 14: ...l ones 54573 4 2 048 MHz Square Wave 54574 2 1 544 MHz EIA RS 422 Square Wave 54575 4 8 kHz EIA RS 422 Square Wave 54575 5 and 5 10 MHz 54577 1 312 The system may also include one or two 54541 2 T1 or...

Страница 15: ...1 July 2006 ___________________________________________________________ __________________________________________________________ CXR Larus 80 100 400 Issue 1 July 2006 1 8 Figure 1 3 Typical StarClo...

Страница 16: ...is not supported with GPS Track and hold cards in any combination must provide the same input architecture either AA or AB 1 34 General GPS Information 1 341 The 54591 and 54593 cards incorporate a GP...

Страница 17: ...Time Assembly The Precision Time Assembly compares this 1PPS with the on board frequency reference of the 54591 54593 to develop a time correction factor for the precision oscillator 1 345 A GPS failu...

Страница 18: ...and a 54510 expansion shelf is 558 Utilizing eight expansion shelves up to 3 062 outputs non protected can be realized 1 4 Cards Note A complete circuit description of each StarClock 200E card is pre...

Страница 19: ...Interface Software E1 Menu Control Interface Software 54550 23 AB 54550 24 AB 54550 21 AB 54550 22 AB Alarm Interface Card master shelf use only for master shelf or expansion shelf 54560 2 54560 3 T1...

Страница 20: ...mposite clock or square waves synchronized to a suitable framed DS1 or E1 reference 5 or 10 MHz reference or GPS atomic time reference Jitter and wander attenuation is a standard function of the track...

Страница 21: ...enter the free run condition after a prescribed time without a suitable input reference The oscillators can also be put in free run for testing If both cards fail the system will use either input if...

Страница 22: ...ITU T G 811 j Holdover stability 1 x 10 10 for 48 hours for Stratum 2 k Invalid input signal detection feature of 54511 54512 Input Cards 54522 54523 54591 and 54593 Track and Hold Clock Cards and 545...

Страница 23: ...ock Card Any combination of output driver cards up to ten listed in paragraph 1 66 A minimal redundant system requires two 54511 54512 and two 54522 5 cards Reference NOTE below 1 64 A minimal Stratum...

Страница 24: ...he 54500 shelf refer to the equipment list in Section 7 One 54580 2 or 4 Network Time Server NTS Card 1 7 Installation Advice 1 71 This system is intended for installation in the telephone central off...

Страница 25: ...5 For additional wiring convenience Model 54505 0 Wirewrap Interface Panel is available This is installed either directly above or directly below the main shelf and it provides 100 sets of T R S wirew...

Страница 26: ...annel banks and any other equipment requiring network synchronization General considerations of network timing distribution Input timing may be derived from existing traffic bearing DS1 or E1 framed s...

Страница 27: ...for digital traffic between switches and digital crossconnects no impairments are observed even when the SONET or SDH system is untimed However it is recommen With either SONET or SDH the multiplex e...

Страница 28: ..._______________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 2 3...

Страница 29: ...CXR Larus 80 100 400 2 4 Issue 1 July 2006 ______________________________________________________________...

Страница 30: ..._______________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 2 5...

Страница 31: ...CXR Larus 80 100 400 2 6 Issue 1 July 2006 ______________________________________________________________...

Страница 32: ...is described in References 1 and 2 paragraph 2 25 and the E1 in References 1 2 and 3 paragraph 2 26 Clocks are grouped into levels based on their ability to maintain accurate timing if their referenc...

Страница 33: ..._________________ NOTE This common reference source is called a Synchronization Timing System STS and is intended to feed a reference signal to all digital equipment within a building As a result all...

Страница 34: ...10 8 day 3 5 hours 3 4 6 x 10 6 Must be capable of synchronizing to clock with accuracy of 4 6 10 x 6 3 7 x 10 7 day 6 minutes 255 in 24 hours 4E 32 x 10 6 Must be capable of synchronizing to clock wi...

Страница 35: ...ge Stability Calculated Time To First Frame Slip Primary Reference Clock 1 x 10 11 N A N A 70 days Transit Node Clock N A Not specified Initial frequency offset of 5 x 10 10 Frequency drift of 1 x 10...

Страница 36: ...etailed rules for There are no fixed rules for the number of Central Clocks that can be used in a cascade Any clock can track any other clock of equal or higher level and will filter out any jitter an...

Страница 37: ...nces 1 and 2 paragraphs 2 25 and 2 26 to avoid timing loops If a string of more than one SONET SDH add drop multiplexer ADM exists between Central Clock timed offices no secondary references should be...

Страница 38: ...s 3 clocks suitable for plesiochronous operation of international digital links 4 al networks which are based on the synchronous digital hierarchy SDH 5 Terminal Equipment DTE and Data Circuit Termina...

Страница 39: ...This page is intentionally left blank...

Страница 40: ...3E LNC Stratum 2 TNC Stratum 1 PRC Cold start 2 28 amps 3 80 amps 4 00 amps After warmup 1 83 amps 2 20 amps 2 30 amps Expansion shelf only 0 90 amps 0 90 amps 0 90 amps 3 212 Approximate Power Consu...

Страница 41: ...lled to 5 C with respect to the normal or average ambient temperature That is the ambient temperature may reside within 0 C to 45 C but the variance in temperature must be held to a 5 C deviation for...

Страница 42: ...r use with external 432 ohm bridging resistors b One wire interface input from the 54550 for setting framing and an input select line from the track and hold for selecting which input signals to place...

Страница 43: ...re 3 1 Model 54511 T1 Input Card Front Panel NOTE For Model 54512 3 the INPUT designation is SQ ___________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page...

Страница 44: ...and hold cards b Differential recovered input clock signal to output driver cards used only if both track and hold cards fail c Alarm signal to 54560 Alarm Interface Card d One wire interface to 5455...

Страница 45: ...2 Bridging input 984 ohms Same signal levels as item 1 3 Monitor input 120 ohms Pulse amplitude range 0 05 volt to 0 3 volt base to peak b 2048 kHz Inputs 1 Terminating input 120 ohms Pulse amplitude...

Страница 46: ..._______________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 7 Figure 3 2 Model 54512 4 E1 Input Card Front Panel NOTE For the Model 54512 3 the INPUT designation is changed t...

Страница 47: ...oes not apply 3 325 Automatic Line Buildout ALBO a E1 Inputs Dynamic range 0 to 36 dB b 2048 kHz Inputs Dynamic range 0 to 15 dB 3 326 Duty Cycle 50 for all input types 3 327 Ones Density Not less tha...

Страница 48: ...s 2 048 MHz clock recovered from either input selected by the corresponding track and hold card converted to 1 544 MHz for output on the backplane to both track and hold cards b Differential recovered...

Страница 49: ...IS 3 3293 Card Power 48 volts 40 mA nominal 3 3294 Power Fuse 0 75 amp Type GMT 3 3295 Fuse Alarm Closure to battery 3 33 Model 54513 Composite Clock 5 MHz 10 MHz RS 422 Input Card 3 331 For the front...

Страница 50: ...___________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 11 Figure 3 3 Model 54513 Input Card Front Panel...

Страница 51: ...track and hold card for selecting which input signals to place on the output lines c Serial Data input from both track and hold cards to the transceiver d Serial Clock from both track and hold cards t...

Страница 52: ...ory control information and other customer designated data LED status and slot ID e Front panel monitor jack for active input signal f Serial communication path through system backplane to from track...

Страница 53: ...Fig 3 4 Model 54522 Stratum 3E Track and Hold Card ___________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 14...

Страница 54: ...s within 9 4 Hz c 2048 kHz Inputs Recovered clock from 54512 3 input cards nominal 2 048 MHz tracks within 9 4 Hz d Composite Clock Inputs Recovered clock from 54513 3 input cards nominal 64 KHz track...

Страница 55: ...hitecture Track and Hold Card B lights the Input A LED when it is tracking Input B and the Input B LED when it is tracking Input A Selection of the other input can be done by a track and hold card whe...

Страница 56: ...00 seconds ACQUIRE 2 state 3 3445 Settling time 3000 seconds in normal tracking state 3 3446 Output Signals a Ovenized crystal oscillator derived from nominal clock frequency of 1 544 MHz tracks input...

Страница 57: ...s r An internal TEST RUN toggle S2 is set in RUN mode for normal operation b Monitor jack 20 dB framed all ones at clock output frequency c Software control for selecting SF ESF or CCS CAS framing for...

Страница 58: ...thesizer control in bottom 25 of range Primary input in use Secondary input in use c Standalone state Internal switch S2 in TEST position Not recommended for normal use r Free running state No input i...

Страница 59: ...54523 refer to Figure 3 5 3 3521 Provisioning Model 54523 3 supports the AB input architecture 3 3522 Input Signals a DS1 Inputs Recovered clock from 54511 input cards nominal 1 544 MHz tracks within...

Страница 60: ...within 9 4 x 10 2 Hz i Serial Data In from transceivers on both input cards j Transceiver Select lines from other track and hold card 3 3523 Framing Format a DS1 Inputs SF or ESF on each input automat...

Страница 61: ...Fig 3 5 Model 54523 Stratum 2 Track and Hold Card ___________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 22...

Страница 62: ...3 to 1 5 volt RMS into an impedance of 50 ohms This feature is not available for reference replacement on the track and hold cards but can be used as tertiary input i e able to be tracked 3 3530 Osci...

Страница 63: ...MHz rubidium derived clock tracking input reference or holding differential backplane signal drives up to ten output cards and one or two 54541 or 54542 Synchronization Monitor Cards b Clock monitor...

Страница 64: ...guess for DDFS e Flash EPROM for software updates f Temperature sensor for future software algorithms for temperature compensated holdover g Predictive holdover feature that remembers the average cor...

Страница 65: ...king has occurred Happens on power up if TEST pushbutton is not being pressed and no good DS1 E1 inputs are present b Error conditions when card goes into HOLD state 2 Excess BPVs does not cause hold...

Страница 66: ...e is not supported NOTE A description of the AB architecture is provided in Appendix A 3 3613 Input Signals Stratum 1 PRC Primary Reference Source PRS is an integral GPS receiver per Bellcore GR 2830...

Страница 67: ...Data Input from transceivers on corresponding input card h Transceiver Select lines from the other track and hold card i Weak RF downlink signal from GPS satellites hitting the rooftop antenna This s...

Страница 68: ...___________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 29 Fig 3 6 Model 54591 GPS Stratum 1 PRS Track and Stratum 3E LNC Hold Clock Card...

Страница 69: ...lerance Per Bellcore TR NWT 000499 and ITU T G 824 3 3618 Input Signal Selection Input to track and hold cards A and B is normally from their own fully integrated GPS receiver If the normal GPS input...

Страница 70: ...1 x 10 8 per day over any 5 C temperature range 3 3624 Traceability 1 x 10 11 3 3625 Warmup Time If the 54591 has been unplugged for more than 20 minutes it can take up to 5 hours before the GPS rece...

Страница 71: ...backplane signal drives up to ten output cards and the 54541 or 54542 Synchronization Monitor Card s b Clock monitor framed all ones c Hold indication bus to output cards d Combined software hardware...

Страница 72: ...algorithm to FREERUN state display shows r An internal TEST RUN toggle S2 is set in RUN mode for normal operation b Monitor jack 20 dB framed all ones at clock output frequency c Software control for...

Страница 73: ...fused with DS1 E1 error condition 9 The lower case g letter has a tail segment that is not present on the digit 9 g Displayed when unit has entered GPS in Position Average mode This is the non steady...

Страница 74: ...se Alarm Closure to battery 3 37 Model 54593 GPS Stratum 1 PRC Track and Stratum 2 TNC Hold Clock Card 3 371 For an illustration of the Model 54593 refer to Figure 3 7 3 3711 This card provides Stratu...

Страница 75: ...Hz Inputs Recovered clock from 54513 5 input cards nominal 10 MHz tracks within 46 Hz g 1 544 MHz RS 422 Inputs Recovered clock from 54513 6 input cards nominal 1 544 MHz tracks within 7 7 x 10 2 Hz h...

Страница 76: ...___________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 37 Fig 3 7 Model 54593 GPS Stratum 1 PRC Track and Stratum 2 TNC Hold Clock Card...

Страница 77: ...l Selection Input to track and hold cards A and B is normally from their own fully integrated GPS receiver If the normal GPS input fails the track and hold card will post an alarm and try to acquire t...

Страница 78: ...receiver has achieved Stratum 1 PRC accuracy If the 54593 has been unplugged for less than 20 minutes it can take up to 2 hours before the GPS receiver has achieved Stratum 1 PRC accuracy in the Known...

Страница 79: ...d Combined software hardware alarm indication to 54560 Alarm Interface Card e Hardware alarm indication to 54550 Information Management Card f Serial data link to 54550 Information Management Card fo...

Страница 80: ...e in the GPS mode Does not disrupt tracking In invalid output state resets tracking algorithm to FREERUN state display shows r An internal TEST RUN toggle S2 is set in RUN mode for normal operation b...

Страница 81: ...048 MHz square wave input card 54512 3 g Displayed when unit has successfully entered GPS in Known mode This is the normal steady state indication Not to be confused with DS1 E1 error condition 9 g Di...

Страница 82: ...725 Power Fuse 2 amps Type GMT 3 3726 Fuse Alarm Closure to battery 3 38 Model 54541 T1 Synchronization Monitor Card 3 3810 For the front panel of the Model 54541 refer to Figure 3 8 3 3811 The T1 Syn...

Страница 83: ...Figure 3 8 Model 54541 T1 Synchronization Monitor Card ___________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 44...

Страница 84: ...5 when installed in the first SM slot five additional external inputs 6 through 10 when installed in the second SM slot Input 5 and Input 10 on the second card can also be supplied from the front pane...

Страница 85: ...s b DS1 error and performance parameters Out of frame OOF events includes AIS LOS events BPV errored seconds count CRC6 errored seconds counts for ESF Mild 1 to 319 CRC6 errors Severe 320 or more CRC6...

Страница 86: ...parameters to be measured the inputs to be scanned the observation interval 1 to 100 000 seconds in decade steps and the number of consecutive intervals iterations to be observed on a given input Up t...

Страница 87: ...ve Synchronization Monitor Card 3 3910 For the front panel of the Model 54542 refer to Figure 3 9 3 3911 The E1 2 048 MHz Square Wave Synchronization Monitor Card is microprocessor controlled with loc...

Страница 88: ...under microprocessor control and may be overridden if desired 3 3915 Input Impedance a Terminating E1 2048 KHz 120 ohms 10 balanced a Bridging E1 2048 KHz 984 ohms 10 balanced a Monitor E1 2048 KHz 1...

Страница 89: ...and performance parameters Out of frame OOF events includes AIS LOS events BPV errored seconds count CRC4 errored seconds counts for CRC4 ES 1 to 805 CRC4 errors SES more than 805 CRC4 errors Frame er...

Страница 90: ...___________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 51 Figure 3 9 Model 54542 E1 2 048 MHz Square Wave Synchronization Monitor Card...

Страница 91: ...cumulated values are stored separately for the 24 most recent one hour intervals on a rotating basis the last 24 hours are stored at any point Each complete rollover of 24 one hour intervals is summar...

Страница 92: ...RC FBE Yellow Cyclic Redundancy Check Sum Frame Bit Error TIE Yellow Time Interval Error MTIE Yellow Maximum Time Interval Error SLIP Yellow Controlled slip event 193 bits UI phase error JITTER Jitter...

Страница 93: ...el 54550 IMU and track and hold clock card must support the same input architecture AA or AB Flash EPROM for software updates large enough to store both TL1 ITL1 and menu versions of the software 128K...

Страница 94: ...___________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 55 Fig 3 10 Model 54550 Information Management Card...

Страница 95: ...om 1200 to 9600 baud May also be used with a modem requires a straight cable different from previous products b EIA RS 232D for remote access supporting standard modem control leads Rates selectable f...

Страница 96: ...arm and status information Retrieve alarm log Set alarm cutoff to 54560 NOTE This is an abbreviated list For a complete list refer to Larus Manual 80 800 400 TL1 ITL1 or 80 801 400 Menu 3 4015 LED Ind...

Страница 97: ...s from track and hold cards and Synchronization Monitor Card s encoding alarm severity on their alarm leads 3 4112 Outputs a Four floating relay contact closures Form A for summary major and minor aud...

Страница 98: ...D Color Indication FAIL Red Card fail fuse or power supply 48 VA Yellow 48 VA not present 48 VB Yellow 48 VB not present MAJOR Red Major Alarm MINOR Yellow Minor Alarm ACO Yellow Alarm Cutoff 3 4115 C...

Страница 99: ...Figure 3 11 Model 54560 Alarm Interface Card ___________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 60...

Страница 100: ...tput card does not cause an error on another card s output 3 4213 Output Load Impedance 100 ohms 5 resistive 3 4214 Output Pulse Amplitude 3 volts 0 6 volt peak meets AT T CB 119 and CCITT G 703 requi...

Страница 101: ...Fig 3 12 Model 54571 T1 Output Driver Card ___________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 62...

Страница 102: ...e faceplate that selects Protected or Non Protected operation with a matching output card 3 4222 LED Indicators Front Panel Label LED Color Indication FAIL Red Card fail CLK A Green Clock A selected C...

Страница 103: ...135 ohms 5 resistive 3 4314 Output Pulse Amplitude 4 0 volts 1 0 volt base to peak Maximum jitter 0 03 UI peak to peak measured within the frequency range of 20 Hz to 20 kHz 3 4315 Rearrangement Phas...

Страница 104: ...bel LED Color Indication FAIL Red Card fail CLK A Green Clock A selected CLK B Green Clock B selected I P A Yellow Input A selected I P B Yellow Input B selected OVERRIDE Yellow Override manual select...

Страница 105: ...Figure 3 13 Model 54572 Composite Clock Output Driver Card ___________________________________________________________ CXR Larus 80 100 400 Issue 2 July 2006 page 3 66...

Страница 106: ...y manual remote selection 3 4412 Output Signals 54573 Bipolar E1 framed all ones at nominally 2 048 MHz CAS CCS or CRC4 framing common frame and multiframe synchronized with other E1 output cards 5457...

Страница 107: ..._________________________________________________ CXR Larus 80 100 400 Issue 1 July 2006 page 3 73 Fig 3 14 Model 54573 E1 Output Driver Card...

Страница 108: ...0 100 400 Issue 1 July 2006 _________________________________________________________ __________________________________________________ page 3 74 Figure 3 15 Model 54574 2 048 MHz Square Wave Output...

Страница 109: ...4573 only e the 54560 The number of output failures is monitored by the 54550 f ts Protected or Non Protected operation with a matching output card 3 olar E1 framed all ones 3 volts 0 6 volt base to p...

Страница 110: ...iver Card 3 4510 For the front panel of the Model 54575 refer to Figure 3 16 3 4511 Input Signal Differential 1 544 MHz TTL clock signal from one of the two track and hold cards or if both of these ha...

Страница 111: ..._________________________________________________ CXR Larus 80 100 400 Issue 1 July 2006 page 3 77 Figure 3 16 Model 54575 RS 422 Output Driver Card...

Страница 112: ...s the loss of one or more outputs b One wire interface to 54550 Information Management Card reports personality and LED and output status and can disable the capacity of any specific output to generat...

Страница 113: ...tput card produces frame synchronization for the rest of the output cards plugging in an output card does not cause an error on another card s output 3 4613 Output Load Impedance 50 ohms 5 resistive 3...

Страница 114: ...arus 80 100 400 Issue 1 July 2006 __________________________________________________________ __________________________________________________ page 3 80 Figure 3 17 Model 54577 5 10 MHz Output Driver...

Страница 115: ...en Clock A selected CLK B Green Clock B selected I P A Yellow Input A selected I P B Yellow Input B selected OVERRIDE Yellow Override manual selection OUTPUT LOSS Red Output loss 3 4620 Card Power 48...

Страница 116: ...inputs input outputs and outputs 3 4710 Inputs a DS1 E1 2048 KHz Inputs 3 terminations 2 wirewrap pins plus ground CC 5 MHz 10 MHz use Inputs 1 and 2 only 1 Input 1 2 Input 2 3 Monitor 3 4 Monitor 4 5...

Страница 117: ...9 RJ45 3 4612 Outputs a Alarms terminal block TB1 1 Major Visual 1 2 Major Visual 2 3 Major Audible 1 4 Major Audible 2 5 Minor Visual 1 6 Minor Visual 2 7 Minor Audible 1 8 Minor Audible 2 9 Unused 1...

Страница 118: ...2 Synchronization Monitor Card g Slot 7 for Model 54550 Information Management Card h Slot 8 for Model 54560 Alarm Interface Card i Slots 9 18 for Model 54571 to 54577 Output Driver Cards NOTE If the...

Страница 119: ..._________________________________________________ CXR Larus 80 100 400 Issue 1 July 2006 page 3 85 This page is intentionally left blank...

Страница 120: ...nterface Card d Selection of the input to be monitored by the 54541 or 54542 Synchronization Monitor Card e Monitoring of card outputs 4 21 Hold Mode Track and Hold Card Tests 4 2110 While in operatio...

Страница 121: ...ation Management Card Normally the clock source is selected automatically on the basis of which clock is available first and which is not in alarm state 4 2211 The manual clock select mode is activate...

Страница 122: ...CXR Larus 80 100 400 Issue 1 July 2006 _____________________________________________ page 4 3 Fig 4 1 StarClock 200E Clock Auto Selection State Diagram...

Страница 123: ...t type to 2 048 MHz square wave Refer to Volume 3 for the TL1 ITL1 command set or Volume 4 for the menu interface 4 2411 The 54541 54542 powers up in a default mode scanning all equipped inputs for 10...

Страница 124: ...the slot 2 54522 54523 Track and Hold Framed all ones if so configured at the clock output frequency 3 54591 GPS Track and Hold Framed all ones if so configured at the clock output frequency 4 54593...

Страница 125: ...alarm to the local and remote craft interfaces If the failure is judged to be on the Information Management Card the alarm LED lights and the 54560 Alarm Interface Card is notified 4 3212 The 54550 I...

Страница 126: ...rs 16 in 10 seconds Same 54541 54542 Synchronization Monitor Card Alarm Default Threshold Other Settable Threshold Loss of Signal LOS From T1 E1 receiver Out of Frame OOF Loss of frame LOF synchroniza...

Страница 127: ...GPS Fail 10 seconds MTIE 1 5 x 10 8 or 1000 seconds MTIE 3 x 10 9 OR Degraded for twelve 10 second periods within 3 months OR Lost communications with GPS subassembly OR Still in GPS warm after 5 hou...

Страница 128: ...___________________________________________________________________ ________ _____________________________________________ page 4 9 This page is intentionally left blank...

Страница 129: ...horing output wiring cable bundles Model 54500 16 for E1 and Model 54500 17 for T1 shelves appear to be identical yet there are minor component value differences 5 21 Functions 5 2110 The backplane re...

Страница 130: ...0 100 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 2 Fig 5 1 StarClock 200E System Model 54500 17...

Страница 131: ...Reference Clock A BNC J21 BNC J21 connector gives an external 10 MHz signal for the A track and hold card 5 2214 External Reference Clock B BNC J22 BNC J22 connector gives an external 10 MHz for the...

Страница 132: ...lf of the shelf The optional 54580 Network Time Server if present must be installed in card slot J18A 5 2222 GPS Antenna 1 J24 J24 is the connector to Global Positioning System GPS Antenna 1 The anten...

Страница 133: ...to DS1 signals 1 544 MHz by clock adapters CLADs on the input card and the 54541 54542 Synchronization Monitor Card 5 3211 T1 E1 Receiver The T1 E1 receiver recovers the data and clock from the T1 E1...

Страница 134: ...100 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 6 Figure 5 2 Model 54511 T1 or 54512 E1 2 048 MH...

Страница 135: ...ED will be on In the event of a complete LOS the PULSES LED will be off The LOS condition results in a card alarm output on pin 44 to the 54560 Alarm Interface Card and to the 54550 Information Manage...

Страница 136: ...y for composite clock 5 MHz or 10 MHz operation 5 41 Functions 5 4110 The Model 54513 Input Card performs the following functions a In conjunction with circuitry on the backplane provides terminating...

Страница 137: ...tracked c The green PULSES LED is on if the PLL oscillator is in working condition d The yellow INPUT FAULT LED indicates an internal fault e The red LOS LED indicates either a loss of signal more tha...

Страница 138: ...______________________________________________________________ ____________________________________________________________ 5 10 Figure 5 3 Model 54513 Input Card select which input s recovered clock...

Страница 139: ...support the same input architecture either AA or AB See Appendix A 5 51 Functions 5 5110 The Model 54522 clock card performs the following functions a Accepts one of two 1 544 MHz clock signals and p...

Страница 140: ...ut reference clock signal via the backplane connector The 54522 can select Input B to be from Input Card A by activating the INPSEL output line a For the AB input architecture the primary reference fo...

Страница 141: ..._____________________________________________________________ __________________________________________________________ 5 13 Figure 5 4 Model 54522 Stratum 3E LNC Track and Hold Clock Card...

Страница 142: ...ts or a CS2181 Transceiver Chip for the E1 inputs The framing circuit detects the following framing errors a Yellow Alarm LOS 175 75 consecutive zeros b BPVs c Invalid CRC6 codes ESF framing only or C...

Страница 143: ...mpared with the phase of the recovered input reference clock by means of a pair of counters and latches good signal or bad a When the input signal is deemed good the microcontroller tracks the input p...

Страница 144: ...card slots Each card also drives a hold indicator bus Selection of the A or B clock is done automatically by logic circuitry on the output cards it can be changed manually from a terminal connected to...

Страница 145: ...current SSM status to the terminal interface For the 54522 it is Stratum 3 If the active clock card receives an SSM that is lower than its own stratum level it will treat the case as LOS If there is...

Страница 146: ...V at 100 mA 5 6 Model 54523 Stratum 2 TNC Track and Hold Clock Card 5 6010 There are two 54523 track and hold cards in a redundant Stratum 2 TNC Transit Node Clock system The 54523 3 supports the AB i...

Страница 147: ...ement Card and 54560 Alarm Interface Card e Facilitates synchronization status messaging per Bellcore GR 378 DS1 E1 only 5 62 Circuit Description Refer to the block diagram in Figure 5 5 in the follow...

Страница 148: ...__________________________________ ____________________________________________________________ 5 20 5 6212 DS1 E1 Receiver The DS1 E1 receiver regenerates the selected incoming signals and recovers b...

Страница 149: ..._____________________________________________________________ __________________________________________________________ 5 21 Figure 5 5 Model 54523 Stratum 2 TNC Track and Hold Clock Card...

Страница 150: ...ble degree of precision e g within one part in 10 9 The DDFS uses a digital process to convert the oscillator signal into a signal having a second related frequency The DDFS accomplishes this conversi...

Страница 151: ...quency 5 6217 Controls and Indicators The following controls and indicators appear on the front panel of the 54523 card a The red FAIL LED indicates an internal FUSE has blown the power supply is not...

Страница 152: ...ll stay on it until the user issues a different command If the signal is bad during external signal tracking the clock card will enter the HOLD mode until the signal recovers However the clock card wi...

Страница 153: ...An on card power converter provides the necessary circuit voltages from the diode combined A and B 48 volt battery supplies The on card fuse if it blows lights the red FAIL LED and provides battery to...

Страница 154: ...ent to the DDFS is then calculated by taking the last long term average of the control values adding the latest successive average of the control value and the correction times the damping value less...

Страница 155: ...receiver fails monitors the DS1 E1 reference signal for framing CRC and out of specification errors An out of specification input signal forces the card to hold to the last known reference with a dri...

Страница 156: ...80 100 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 28 Figure 5 6 Model 54591 54593 Card GPS Mode...

Страница 157: ...t to the GPS signal The microcontroller reads the error from the GPS receiver and provides a correction to the DDFS setting b DS1 E1 Input The 54591 card gets its clock from the 54511 or 54512 Input C...

Страница 158: ...0 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 30 Figure 5 7 Model 54591 GPS Stratum 1 with Strat...

Страница 159: ...signals from any other Stratum 3 LNC or higher source i e Stratum 2 TNC or 1 PRC having a frequency offset of no more than 7 1 Hz 5 8222 Framer The 54591 communicates with a CS2180 Transceiver Chip fo...

Страница 160: ...s piece wise linear since normal and ACQUIRE 2 can alternate 5 8225 Controls and Latches The output phase is compared with the phase of the recovered input reference clock by means of a pair of counte...

Страница 161: ...ell as control personality and with DS1 only sync messaging data 5 8230 Clocks A and B Each of the two 54591 cards in a redundant system drives a Clock A or B differential clock bus to the ten output...

Страница 162: ...1 A GPS signal is considered a PRS so if the clock card is tracking a GPS input the clock will send out a PRS SSM If the active clock card receives an SSM that is lower than its own stratum level it w...

Страница 163: ...n are collected and averaged over about a seven second period to provide input to the control algorithm If at any point in the accumulation and calculation period a condition is detected excessive err...

Страница 164: ...sts of two 64K blocks of memory one each for program and data 5 9211 Inputs a GPS Receiver The 54593 card supplies the GPS receiver with the 1 544 MHz reference The receiver determines the error in th...

Страница 165: ...__________________________________________________________ __________________________________________________________ 5 37 Figure 5 8 Model 54593 GPS Stratum 1 Track and Hold Card with Stratum 2 Holdo...

Страница 166: ...rors a Yellow Alarm LOS 175 75 consecutive zeros b BPVs c Invalid CRC6 codes ESF framing only or CRC4 codes CRC4 framing only An impaired signal causes the microcontroller to cease tracking go into th...

Страница 167: ...output phase is compared with the phase of the recovered input reference clock by means of a pair of counters and latches good signal or bad a When the input signal is deemed good the microcontroller...

Страница 168: ...essaging data 5 9219 Clocks A and B Each of the two 54593 cards in a redundant system drives a Clock A or B differential clock bus to the ten output card slots Each card also drives a hold indicator b...

Страница 169: ...the clock card is tracking a GPS input the clock will send out a PRS SSM If the active clock card receives an SSM that is lower than its own stratum level it will treat the case as LOS If there is no...

Страница 170: ...IE bit and frame slips peak to peak wideband jitter above 10 Hz and peak to peak wander over the selected observation interval TIE MTIE and wander are calculated from phase data processed through a 10...

Страница 171: ...choices are primary secondary and one of three external inputs 5 1022 Dual DS1 E1 Receiver Clock Adapter The dual DS1 E1 receiver recovers clock and data from the selected inputs after 20 dB amplifier...

Страница 172: ...80 100 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 44 Figure 5 9 Model 54541 54542 Synchronizati...

Страница 173: ...5 nanosecond resolution over 8 UI An up down overflow or unit interval counter extends this range to 256 x 8 UI or 2048 UI a total range of 2 6 milliseconds or 20 frames The hardware phase sampling r...

Страница 174: ...ected either manually by the front panel MON SELECT button or by automatic scan at user controlled intervals through the 54550 card The selected input number appears on the seven segment display and i...

Страница 175: ...iefly shows the new input being monitored when the input is changed otherwise the display shows the bit slip between the A B input clocks k The MON SELECT pushbutton is used for manually selecting eac...

Страница 176: ...o send unsolicited information to the 54550 card 5 1102 The 54550 Information Management Card is provisioned at the factory in the following configurations a 54550 0 supports the AA input architecture...

Страница 177: ...card The 54550 card uses the MC68332 which is a highly integrated 32 bit microcontroller MCU combining high performance data manipulation capabilities with powerful peripheral subsystems The MCU is bu...

Страница 178: ...m access memory of 512 kbytes on the card provides storage of alarm and performance data obtained from the SMC The 54550 contains a DS1646 128K x 8 nonvolatile timekeeping RAM 5 1127 Clock Select Data...

Страница 179: ..._____________________________________________________________ __________________________________________________________ 5 51 Figure 5 10 Model 54550 Information Management Card...

Страница 180: ...erial peripheral interface QSPI of the queued serial module to communicate with the input alarm and output cards 5 1131 Local Area Network Controller for Ethernet 10 Base T The 54550 Information Manag...

Страница 181: ...1201 The STS 54500 system allows for one Alarm Interface Card This card receives alarm information from all the other cards 5 121 Functions 5 1211 The Model 54560 Alarm Interface Card performs the fo...

Страница 182: ...arm PULSE output equals a Major alarm 5 1222 Controls and Indicators The following controls and indicators appear on the front panel of the card a The red FAIL LED lights if the on card fuse blows or...

Страница 183: ..._____________________________________________________________ __________________________________________________________ 5 55 connecting to pin 10 on the backplane terminal strip TB1...

Страница 184: ...rus 80 100 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 56 Figure 5 11 Model 54560 Alarm Interfac...

Страница 185: ...ail Major alarm state c The first output card from the left any slot acting as a master selector and all other output cards slaved to it to ensure that all output cards select the same clock reference...

Страница 186: ...g input either A or B is selected d The yellow OVERRIDE LED lights when automatic selection has been overridden by manual remote selection e The red OUTPUT LOSS LED lights when a loss of one or more o...

Страница 187: ..._____________________________________________________________ __________________________________________________________ 5 59 Figure 5 12 Model 54571 T1 Output Driver Card...

Страница 188: ...rence input in the event that both track and hold cards fail Major alarm state c The first output card from the left any slot acting as a master selector and all other output cards slaved to it to ens...

Страница 189: ...the on card fuse blows b The green CLOCK A B LED lights when the corresponding clock either A or B is selected c The yellow INPUT A B LED lights when the corresponding input either A or B is selected...

Страница 190: ...puts are suppressed f The front panel MON jack allows for monitoring one of the output signals with a standard monitoring test set The Model 54572 has ten outputs with independent drivers g On card ju...

Страница 191: ..._________________________________________________________ __________________________________________________________ 5 63 Note twenty outputs now Figure 5 13 Model 54572 Composite Clock Output Driver...

Страница 192: ...B track and hold cards The current tracking card or if both are in HOLD the last track and hold card to go into the HOLD state is selected Switching is nonrevertive to minimize the number of phase dis...

Страница 193: ...hase buildout circuit whose function is to smooth out sudden phase changes which might be as much as 1 2 a unit interval occurring when the clock selection is changed The change of phase rate is limit...

Страница 194: ...0 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 66 Note twenty outputs now Figure 5 14 Model 54573...

Страница 195: ...____________________________________________________________ __________________________________________________________ 5 67 NOTE twenty outputs now Figure 5 15 Model 54574 2 048 MHz RS 422 Output Car...

Страница 196: ...one or more outputs occurs If both A and B clocks and both input references fail leaving no valid signal for the output cards to select the OUTPUT LOSS LED lights and all outputs are suppressed f The...

Страница 197: ...ion Management Card allowing for manual clock selection and for automatic switching directly to a reference input in the event that both track and hold cards fail Major alarm state c The first output...

Страница 198: ...lights when a loss of one or more outputs occurs If both A and B clocks and both input references fail leaving no valid signal for the output cards to select the OUTPUT LOSS LED lights and all outputs...

Страница 199: ..._____________________________________________________________ __________________________________________________________ 5 71 Figure 5 16 Model 54575 RS 422 Output Driver Card...

Страница 200: ...o a reference input in the event that both track and hold cards fail Major alarm state c Synchronization bus not required However when installed in the master position the 54577 will generate the sync...

Страница 201: ...n automatic selection has been overridden by manual remote selection e The red OUTPUT LOSS LED lights when a loss of one or more outputs occurs If both A and B clocks and both input references fail le...

Страница 202: ...80 100 400 Issue 1 July 2006 ______________________________________________________________ ____________________________________________________________ 5 74 Figure 5 17 Model 54577 5 10 MHz Output Dr...

Страница 203: ...of the first card to Ring of the second card and this is for all of the twenty outputs that need this redundancy function enabled probably all twenty a The first card of a protected pair to be inserte...

Страница 204: ...the decision to take timing on port A or port B This can be done with any 10 output card type or with any 20 output card type that has a jumper set for Non protected operation g The third illustratio...

Страница 205: ...__________________________________________________________ 5 77...

Страница 206: ...l 6 11 12 27 28 Output signal 7 13 14 29 30 Output signal 8 15 16 31 32 Output signal 9 17 18 33 34 Output signal 10 19 20 In the StarClock 100 system typical output cards bore 10 output signals per c...

Страница 207: ...on a wirewrap pin field of 20 output capacity Basically of the 20 pairs of tip and ring wirewrap pins on the shelf pins 1 16 are unused and pins 37 40 are unused The ten output signals begin on pins 1...

Страница 208: ...y in San Jose California unless stipulated differently under contract It is the purchaser s responsibility to return at its expense the allegedly defective product to CXR Larus The purchaser must obta...

Страница 209: ...s disclaims all warranties on products furnished hereunder including without limitation all implied warranties of merchantability and fitness and the stated express warranties are in lieu of all oblig...

Страница 210: ...e first track and hold assembly to power up and produce timing pulses will be the initial active timing source for the 2 output driver cards so all these output cards will utilize the same reference s...

Страница 211: ...y the output cards If there is a failure of Input 1 Input Track and Hold A goes into holdover mode and checks whether the secondary input signal is good If it is Input Track and Hold A switches to tra...

Страница 212: ...Larus 80 100 400 Issue 1 July 2006 A 3 Figure A 1 StarClock 200E AA Clock Architecture Figure A 2 StarClock 200E AB Clock Architecture AB is universally used in North America...

Страница 213: ...ted via the backplane to allow each track and hold to monitor the other one The phase alignment feature causes the secondary card to continually attempt to align its phase with the primary card The re...

Страница 214: ...AB 2 This page is intentionally left blank...

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