A New Concept of Providing Telemetry Data in Real Time

Transcription

1 The Spce Congress Proceedings 1967 (4th) Spce Congress Proceedings Apr 3rd, 12: AM A New Concept of Providing Telemetry Dt in Rel Time John M. Bllock Pn Americn World Airwys, GMRD, Ptrick Air Force Bse, Florid Follow this nd dditionl works t: Scholrly Commons Cittion John M. Bllock, "A New Concept of Providing Telemetry Dt in Rel Time" (April 3, 1967). The Spce Congress Proceedings. Pper 7. This Event is brought to you for free nd open ccess by the Conferences t ERAU Scholrly Commons. t hs been ccepted for inclusion in The Spce Congress Proceedings by n uthorized dministrtor of ERAU Scholrly Commons. For more informtion, plese contct commons@eru.edu.

2 A NEW CONCEPT OF PROVDNG TELEMETRY DATA N REAL TME John M. Bllock Pn Americn World Airwys, GMRD Ptrick Air Force Bse, Florid ntroduction The Air Force Estern Test Rnge hs recently instlled the first elements of new Rel Time Telemetry Dt System which will give the Rnge gretly expnded cpbility of providing telemetry dt to the Rnge User in rel time. This system ws designed using new concept of providing telemetry dt in rel time. An explntion of this new concept nd of the Rel Time Telemetry Dt System will be presented in this pper. The impct of this system on the Rnge User will lso be discussed. Previous Methods The previous method of supplying rel time dt to Rnge Users ws by providing either low bit rte seril PCM dt or limited bndwidth FM dt. Prmeters contined in down link with rte higher thn ny vilble retrnsmission rte from down rnge site could not be provided to the Rnge User in rel time. The only method of providing this dt ws in ner rel time. This entiled recording the dt on mgnetic. tpe t the down link rte nd plying the tpe bck t some slower speed so tht the new dt rte ws comptible with n vilble conm1unictions link rte. New Method Mny Rnge Users require only selected prmeters from the telemetry down links. f, insted of retrnsmitting the entire down link to the Rnge User, the down link is decommutted t the receiving site nd only those prmeters tht re ctully required re retrnsmitted, dt from severl down links cn be sent over the sme communictions system previously used to retrnsmit one down link. More efficient usge of the vilble retrnsmission bndwidth cn be mde using this concept, nd more Rnge User requirements cn be supported in rel time. The new Rel Time Telemetry Dt System uses this concept of providing telemetry dt in rel time. t cn select prmeters from severl synchronous down links nd from severl AFETR sttions, nd provide these prmeters to the Rnge User in rel time. The number of prmeters tht cn be provided is limited only by the vilble retrnsmission rte nd the required repetition rte. The Rel Time Telemetry Dt System nd its opertion must be explined before the implementtion of this new concept nd its impct upon the Rnge User cn be fully understood. Generl System Description The Rel Time Telemetry Dt System (RTTDS) equipment ws designed nd mnufctured by RCA, Moorestown, New Jersey. t uses mgnetic core progrmmble memories nd integrted circuit logic. The equipment is divided into two mjor sections or groups. The first section is clled the Centrl Site equipment nd is locted t Tel 4 on the John F. Kennedy Spce Center, Merritt slnd, Florid. The second section is clled the Signl Progrmmer nd Conditioner (SPAC). These units re locted t down rnge sttions (either lnd bsed or shipbord). Currently, SPACs re instlled t Grnd Bhm slnd, Antigu, nd Ascension slnd, which re AFETR Sttions 3, 91 nd 12. Additionl SPACs will be instlled on five rnge trcking ships in the ner future. The SPAC ccepts digitl dt from time division multiplex sttions (TDMs) nd from nlog to digitl converters (A/Ds) tht output Telemetry Common Lnguge. This Common Lnguge (see Figure 1) consists of 48-bit prllel words. Ech word contins word clock pulse, 12 dt bits, dt prity bit, 11 min frme identifiction (MFD) bits, 11 subfrme identifiction (SFD) bits, 4 word size bits, nd other miscellneous control bits. Dt must be in this form for entry into the SPAC. The SPAC will select the desired prmeters out of these different inputs nd retrnsmit them vi communictions to the Centrl Site RTTDS equipment t Tel 4. The dt from the down rnge SPACs is routed through the Centrl Site nd de- 1 ivered to the Rnge Users in severl different formts. This bsic dt flow is shown in Figure 2. Dt received nd decommutted t Tel 4 cn lso be routed through the Centrl Site nd delivered to the Rnge Users. The Signl Progrmmer nd Conditioner Figure 3 is block digrm of the SPAC equipment. Dt from the TOM or A/D Common Lnguge sources is entered into device clled Dt Selector nd Storge Buffer (DSSB). This unit is contined in one rck nd hs 4,96 word mgnetic core memory. t cn receive dt from up to three different Common Lnguge sources with the limittion tht the sum of the rtes of the three sources cn not exceed 1, words per second. Progrms contined in the DSSB memory control the storge of section of the input frme tht contins the prmeters required by the Rnge User(s) in rel time. At the time of dt storge, current rnge time from the Rnge Time Decoder (RTD) cn lso be stored in the DSSB memory for lter retrnsmission. Prmeters routed to the Dt Selector nd Storge Buffer will lwys be stored in known memory loctions. Ech time prmeter ppers t the input, it will be stored in the sme loction in which the previous smple of the sme prmeter ws stored. Therefore, the dt vlue contined in ny specific DSSB memory loction is the ltest dt vlue received nd stored by the DSSB. There is no permnent storge of dt in the DSSB. To obtin specific dt smple from the DSSB, it must be red out before nother smple of the sme prmeter is received. The lnd bsed SPACs were originlly procured with two DSSBs per SPAC. Ascension currently hs three DSSBs. The shipbord units will hve only one DSSB. 13-1

3 The next unit in the signl flow pth is the Retrnsmission Progrnuner (RP). The RP lso contins 4,96 word memory nd uses integrted circuit logic. The RP's function is to request dt from the DSSB(s) nd formt it into seril PCM strem which is fed to co111tiunictions modem for retrnsmission to the Centrl Site. To do this, the RP requests the contents of DSSB memory loction. The DSSB plces the contents of this memory loction on common bus. The dt is routed to the RP output buffer nd clocked out in seril formt to the communictions modem. The RP progrm is written to select the required dt from memory loctions of the DSSB(s) in the proper sequence. These loctions contin the down link dt prmeters tht re required by the Rnge User. The RP cn select dt from up to 18 different down links provided the SPAC hs full complement of six DSSBs with three inputs per DSSB. To mintin the sme dt smpling rte s used on the down links with this number of independent synchronous sources requires tht complex dt mixing problems be solved before the RP progrms cn be written. The output of the RP is seril PCM NRZL formt, with clock. The rte is selectble from 25 to 4, bits per second. The Progrm Entry nd Control (PEC) unit shown on the digrm in Figure 3 controls the entry of progrms to the vrious memories of the SPAC. The PEC lso controls the opertion of the progrms in these memories. Ech memory cn contin two progrms t one time with one in opertion nd the other in stndby. The PEC monitors the sttus of these progrms s to which is opertive nd which is stndby. t lso provides for progrm entry vi pper tpe reder, llows mnul entry nd modifiction of progrms, nd llows the opertor to red the contents of ny memory loction to check the progrms. These functions cn be performed t the sme time tht progrm is operting in the memory. The PEC lso contins test nlyzer which, in conjunction with specil test progrms, llows the SPAC to be tested for equipment operbility. As shown in Figure 3, there is n optionl interfce with CP 642A/USQ-2(U) computer. The computers re not now vilble t the down rnge sites. f nd when they re vilble, they cn request dt from the DSSBs, perform either dt smoothing or dt compction opertion on the dt, nd feed it bck to the RP. The Centrl Site Figure 4 is block digrm of the Centrl Site RTTDS equipment. The down rnge dt from up to sixteen communictions modems is fed to the Centrl Communictions Adpter (CCA) nd the Centrl Switch Mtrix (CSM). All modems tht interfce with the CCA provide clock long with the dt. The purpose of the CCA is to convert the dt from these modems to internl RTTDS logic levels. The CSM is diode switching mtrix tht switches the dt from ny one of the sixteen lines to the input of ny one up to five Centrl Retrnsmission Decommuttor nd Storge Buffers (CRDSBs). Currently, there re only two CRDSBs t the Centrl Site. Ech CRDSB contins 4,96 word memory. The CRDSB progrm must be comptible with the RP progrm of the SPAC tht is providing dt to the CRDSB. The function of the CRDSB is to decommutte nd store the retrnsmitted dt. The CRDSB will serch for the sync word in the dt received from the SPAC nd, when sync is found, store the subsequent dt words in its own memory. Ech time prticulr prmeter ppers t the input of the CRDSB, it will be stored in prticulr memory loction. When new smple of prmeter is received, the old smple is destroyed nd the new smple replces the old smple in memory. n this respect, the CRDSB is just like the DSSB in tht ny dt vlue contined in CRDSB memory loction will be the ltest vlue received nd stored by the CRDSB. The CRDSB cn decommutte ll of the different output formts from the SPAC. The mximum input rte to the CRDSB is 2, bits per second. Also, t the Centrl Site re three Centrl Dt Selector nd Storge Buffers (CDSSBs). This number is expndble up to nine. The CDSSBs re identicl to the DSSBs of the SPACs nd operte in the sme mnner. The Rnge Time Decoder t the Centrl Site is identicl to tht in the SPAC. With ptching option, current rnge time from this unit cn be stored in the CDSSBs with the dt for lter retrnsmission. The next unit in the signl flow pth is the Distribution Progrmmer (DP). t functions quite similrly to the RP in tht its progrms request dt from the different units in the required sequence by specifying the memory loctions nd the unit number. The unit then plces the contents of tht memory loction onto common bus. The dt is routed through to n output buffer nd delivered to the Rnge User(s). The min difference between the DP nd the RP is the number of simultneous output formts vilble from the DP. The RP hs only one seril output wheres the DP hs nine outputs with both seril nd prllel formts. The outputs re shown in Figure 6 nd will be described lter. The Progrm Entry nd Control (PEC) unit of the Centrl Site functions in the sme mnner s tht of the SPAC. t contins memory sttus monitor, pper tpe reder for entering progrms, mgnetic tpe unit tht cn red progrms into nd out of memory, nd printer to print out the contents of memory. t lso contins test nlyzer which, in conjunction with specil test progrms, llows either the Centrl Site, or the SPAC nd Centrl Site operting together, to be ssessed for equipment operbility. f mission progrms re used the dt will no longer be in the specil formt required by the test nlyzer. The dt cn be sent to the printer nd listing of the dt vlues cn be mde. Progrm verifiction is ccomplished by compring the vlues received nd printed out versus the predicted vlues. Also shown in Figure 4 is Projection Disply System (PDS). This unit provides selective presenttion of system qulity ssessment dt nd ssocited opertionl sttus informtion. A typicl disply 13-2

4 formt is shown in Figure 5. The informtion supplied to the Projection Disply System is either brought up from the SPAC or entered into the system from the Rnge nstrumenttion Control System (RCS). Figure 6 lists the DP outputs; Ech output is under seprte progrm control. Output 1 is the RTTD Lnguge output. This output is vilble in three different formts with the sme dt plced on ech of the three different lines. The first formt is prllel 36-bit word tht is comptible with the Telemetry Common Lnguge but does not contin ll of the ddress bits nd control bits of the Corrnnon Lnguge. However, it cn be used by the units tht normlly use Common Lnguge s n input. This prllel output is used for routing dt round Tel 4 to locl users. The other two formts vilble re in seril form with BCD identifiction tgs or binry identifiction tgs for KSC or CKAFS users. These outputs re fed to modems nd routed to units clled Receiving Control Equipments (RCEs) locted ner the user's equipment. The RCE is bsiclly seril to prllel converter. t converts the seril 36-bit fixed length words to prllel 36-bit words for entry into the Rnge User's equipment. The RCE output rtes re from 5 to 2, words per second. Output No. 2 is similr to output No. 1. t is seril 36-bit word formt designed to be used s n input to the CDC 36 computer t the Rel Time Computer Fcility. The Receiving Control Equipment t the Computer Fcility converts the dt to prllel formt for entry into the computer. The third output is high rte seril PCM formt without ddress tgs. Word length is vrible from 4 to 12 bits per word. The output rte is vrible from 3 to 8 kilobits per second with fixed stop t 4.8 kilobits per second for comptibility with Bell 31 modem. Outputs 4 nd 5 re the medium rte seril outputs nd re similr to output 3 except tht their rtes re from 5 to 3 bits per second. They will be used to interfce with modems such s the Bell 21. Outputs 6 nd 7 provide low rte teletype formt with or without strt/stop chrcters, nd with from 1 to 16 chnnels in prllel on ech output. The mximum rte without strt/stop chrcters t 16 chnnels is 12 bits per second. Outputs 3, 4, 5, 6, nd 7 will be used to retrnsmit dt to users remote from the KSC/CKAFS re. The eighth output goes to the Dt Correction Sttion t Tel 4. ts formt is prllel Conmn Lnguge comptible 36-bit word. The mximum rte is 5 words per second. The ninth output is internl to the RTTDS nd feeds the Projection Disply System described erlier. Signl Flow System Opertion Figure 7 depicts typicl signl flow through the Rel Time Telemetry Dt System. n this exmple, dt from GB is being retrnsmitted to the Rel Time Computer Fcility. The dt s received t GB is in the seril formt of the down link t the input to the TOM. The TOM identifies dt prmeter by its position in the formt with respect to sync word. After the TOM decommuttes the dt, it is routed to the DSSB in the Telemetry Corrnnon Lnguge formt A dt prmeter is now identified by Common Lnguge ddress plced on the prmeter by the TOM. Dt is then stored in the DSSB s described erlier. A dt prmeter is now identified by its loction in the DSSB memory. The RP requests the dt from the DSSB usinq the memory loctions s ddresses nd routes the dt.to the communictions modem in seril PCM formt. A dt prmeter is now identified by its formt position with respect to the RP sync word. The seril strem is trnsmitted uprnge to the CRDSB where the dt is entered into the CRDSB memory. The CRDSB identifies the dt by the RP formt position. The dt is now in prllel formt nd is identified by its loction in the CRDSB memory. The DP requests the dt from the CRDSB nd outputs it in the seril formt of fixed 36-bit word length where dt prmeter is identified by the RTTD Lnguge ddress contined in this 36-bit word. The dt is routed to the Computer Fcility where the RCE converts the dt to prllel formt nd it is entered into the computer. A dt prmeter is now identified by the computer memory loction. A computer routine will request the dt by using the memory loctions s ddresses. n this exmple there re six progrmmble devices in row tht must be comptible. Any chnge in ny one of the progrms will negte nd mke invlid the progrms of the following units. The Rnge hs compiler routine for the 36 nd 794 computers tht ssists the progrmmer in solving the dt mix equtions for the retrnsmission links nd in writing the RTTDS progrms. Typicl Mission Figure 8 shows the signl flow pths for severl phses of typicl mission. This typicl mission for the RTTDS requires tht the Centrl Site provide dt from the CDSSBs to the Rnge User during the lunch phse. The dt, received t Tel 4, is deconmutted by the Tel 4 TDMs nd fed to the CDSSBs. When GB Telemetry cquires the signl nd strts sending good dt to Tel 4, the DP progrm in the RTTDS will be chnged to tke dt from CRDSB No. 1 nd send the dt to the Rnge User. As the vehicle pproches Antigu, Antigu Telemetry will cquire the signl nd the SPAC t tht site wi 11 send dt to CRDSB No. 2. f both sites re sending identicl dt, chnge will not be required in the DP progrm other thn the dt source, which should be chnged from the first CRDSB to the second. This cn be done with simple push of switch on the DP control console. Once dt from Antigu is being sent to the Rnge User, CRDSB No. 1 tht originlly ws used to decommutte the GB dt will be chnged to operte with different progrm lredy contined in memory. This progrm Jill decommutte retrnsmitted dt from ship locted somewhere between Antigu nd Ascension. While dt from the ship is being received, the other CRDSB will be set up to decommutte the dt retrnsmitted from Ascension Telemetry. t now becomes obvious tht the down rnge dt will be lternted bck nd forth between the CRDSBs s the vehicle continues on down rnge. 13-3

5 Hndover between sites is not utomtic, it is mnul, nd the opertor must perform mnul opertion to mke this hndover fror.1 one progrm to nother. He initites hndover using s bsis for his decision the mission profile, the voice dt received from the down rnge site, nd the qulity ssessment dt s it is received from down rnge nd displyed on the Projection Disply System of the RTTDS. Severl sets of progrms will be required for the RTTDS for ny mission. Ech dt mix requires different set of comptible progrms. n this exmple, the first set of progrms ws used to send the Tel 4 dt to the Rnge User. The second set of progrms ws used to send both GB! nd Antigu dt to the Rnge Users. The sme progrms were used for both sites since they were required to send identicl dt. The third set of progrms ws used to send the ship dt nd the Ascension dt to the Rnge Users. Norml Mode Formt Considertions The dt s supplied to the Rnge User by the Rel Time Telemetry Dt System will be different from tht previously provided by the Rnge when the entire seril strem ws supplied. This is true since the system cn select dt from severl different synchronous sources, mix this dt mintining the sme smpling rtes if possible, operte t fixed rte comptible with the vilble communictions modems, etc. t is possible for the system to select nd retrnsmit ll of the dt from one or more low rte down links. llov1ever, since the dt must be retrnsmitted from the SPAC to the Centrl Site ut rte fixed by the vilble communictions modems, it probbly will require bit stuffing to higher rte. f retrnsmission rte equl to or higher thn the down link rte is not vilble, only prt of the Jt my be retrnsmitted in rel ti me. As mentioned in the description of the opertion of the DSSBs nd the CRDSBs, when dt prmeter is requested from these units, the ltest vlue received nd stored in their memories is the vlue tht is trnsmitted. The P in the SPAC cn red from the DSSB fster thn the DSSB is loded by the TOM. t is possible for the RP to request prmeter from the DSSB immeditely fter is is received nd stored. The RP might then request the next prmeter before it is received nd stored by the DSSB. Tt1e vlue tht 1 1s received nd stored by the DSSB during the previous down link frme would be the vlue retrnsmitted under these conditions. n this prticulr exmple n updted vlue from one frme ws retrnsmitted nd the next word retrnsmitted ws vlue tht hd been in storge since the previous frme. Frme correltion of the dt is not mintined. Since the RP rte nd the down link rtes re synchronous, it is possible tht the RP would miss smple of prticulr word or send smple twice. For the other condition where the DSSB input is much fster thn the RP output, the RP could not tke ll the input words, but the correltion problem still exists. Down link frme correltion cn lso be lost when the DP tkes dt from the CRDSBs or the CDSSBs. Dt Freeze Sub Mode To be ble to provide dt words correlted within down link frme to the Rnge User, specil sub mode clled Dt Freeze cn be implemented in the RTTDS. n this sub mode the DSSBs operte in four mutully exclusive sttes. The sttes cycle, l, 2, 3, nd 4 nd then bck to l, nd in tht order only. The first stte is "red in", the second is "wit to be red out," the third is "red out," nd the fourth is "wit to be red in." n this sub mode frme of dt is stored in the DSSB nd the input is then inhibited until the stored dt hs been red out by the RP. A frme is red in, the RP reds it out, nd nother frme is red in. t cn be seen tht for n idel timing sitution wherein it tkes one frme period to red in frme nd the RP immeditely requests it, the witing time i s reduced to zero nd the RP will red out the dt within one frme period. The DSSB will then red in nother frme but n entire frme of input dt hs been missed. For more relistic timing sitution the RP would not request the dt immeditely fter it is loded. This is quite likely, since the rtes of the RP nd the down link re completely synchronous. The dt lost in the worst timing itution cn be two frmes out of three. To void this sitution, three DSSBs must be used in the Dt Freeze sub mode. The ussbs lod lternte frmes nd the RP reds lternte frmes from the DSSBs. Control of this loding nd unloding is through specil logic desicined for this specific purpose. Only one in put of the DSSBs cn be used for Dt Freeze. At the Centrl Site the dt is loded into the CRDSB where the progrm is written s if the dt 1 1ere supercomrnutted t three to one rtio. This mens tht the first frme received from the SPAC is loded into one set of memory loctions, the next frme into second set, the third frme into third set, the fourth frme bck into the first set of memory loctions, etc. The DP must red out one set of the dt within the time it tkes to lod in set. When the DP requests dt from the CRDSB, specil dt freeze control logic directs the DP to the set of memory loctions tht contins the lst updted group of correlted dt. f the DP does red slower thn the input rte to the CRDSB, it will get behind nd cn miss n entire frme of dt. f it reds fster, it might send group of correlted dt more thn once. The DP nd CDSSBs operte in Dt Freeze in the sme mnner s the RP nd DSSBs. The RTTDS cn provide frme correlted words from down link, but becuse of the vrious considertions described bove, it is impossible from prcticl stndpoint for the DP to exctly duplicte the seril PCM down link s n output from the Centrl Site RTTDS t Tel 4. Conclusion Previous methods used on the AFETR for supplying rel time telemetry dt to Rnge Users were limited lmost entirely to supplying low bit rte seril PCM dt or nrrovj bndwidth Ff-1 dt. The Rel Time Telemetry Dt System cn select prmeters from ny down link tht cn be decommutted by ex i sting AFETR TOM decommuttors. The number of down links tht cn be ccepted depends on the number of Dt Selector nd Storge Buffers vilble nd 13-4

6 the ctul down link rtes. The mount of dt tht cn be retrnsmitted from the down rnge sites is limited by the retrnsmission bndwidths now vilble. This selected dt from severl sites is vilble to the Rnge Users in prllel. seril PCM, nd teletype formts. Thus, most of the dt tht is required by the Rnge Users will be vilble in stndrd formt in rel time. By implementing this new concept of providing telemetry dt in rel time, the AFETR hs gretly expnded its rel time telemetry retrnsmission cpbilities nd will be ble to support Rnge User requirements to much higher degree thn previously ttined. 13-5

7 ... PN MAN FRAME DENTFCATON FG. 1 ' PROGRAM SWTCHOVER }SPARES 1 CLOCK SUB FRAME 1l DENT Fl CATON PATA 33 eo1 ( 799 BCD) (12 BNARY LNES) ! t WORD SZE COUNT 14 DATA PARTY S (15 BNARY) CONTNUED WORD T. D.M. OUT OF SYNC (799 BCD) ! } SGNAL GROUND 24 2 AFETR TELEMETRY COMMON LANGUAGE FORMAT

8 RECEVER TOM SGNAL PROGRAMMER & CONDTONER COMM MODEMS c,.., -:i } RECEVER \ GB, ANTGUA, ASCENSON OR SHP. CENTRAL REAL TME TELEMETRY DATA SYSTEM EQUPMENT (TEL 4 KSC) o.l en en ::::> ::::> lj Q. (!) z :::> <( :: TOM SGNAL PROGRAMMER 8 CONDTONER COMM MODEMS BLOCK DAGRAM REAL TME TELEMETRY DATA SYSTEM FG. 2

9 ( OPTONAL CP 642A/USQ- 2 COMPUTER TELEMETRY COMMON ck LANGUAGE NPUTS FROM TD Ms OR A/D DATA SELECTOR TO RANGE DSSBs TME RANGE TME DEC.ODER, 1 1 PROGRAMMER STORAGE BUFFER DATA SELECTOR STORAGE BUFFER, :i -ti DATA SELECTOR t -t!.! STORAGE BUFFER J (UP TO 6) retransmsson ALL UNTS PROGRAM ENTRY CONTROL BLOCK DAGRAM SGNAL PROGRAMMER CONDTONER FG. 3 SERAL PCM OUTPUT TO COMMUNCATONS MODEM

10 DOWNRANGE DATA FROM COMM MODEMS 6 LNES CENTRAL COMM ADAPTER 8 CENTRAL SWTCH MATRX CENTRAL RETRANSMSSON DECOMMUTATOR 8 STORAGE BUFFER TO CDSSBs RANGE TME L...--RANGE DECODER r...- TME DSTRBUTON TO RANGE PROGRAMMER USERS CENTRAL RETRANSMSSON DECOMMUTATOR 8 STORAGE BUFFER r---central-1 RETRANSMSSON DECOMMUTATOR 1 storage L_BUFFER.J {UP TO 5) RCS ALL UNTS -- CONTROL DSPLAY PROGRAM ENTRY 8 CONTROL RECEVNG EQUPMENT PROJECTON SYSTEM MAG TAPE PRNTER CENTRAL DATA SELECTOR 8 STORAGE BUFFER CENTRAL DATA SELECTOR 8 STORAGE BUFFER CENTRAL DATA SELECTOR 8 STORAGE BUFFER (UP TO 9) r , CENTRAL DATA 1, L- - - SELECTOR 8 STORAGE BUFFE TELEMETRY COMMON LANGUAGE NPUTS FROM TOM'S OR A/D 1 S 9 CENTRAL STE BLOCK DAGRAM FG. 4 <:.!>

11 STATON t SUMMARY STATUS ASSGNED ANT 2 3 PDS TOM CRDSB 2 3 THESE CRCLES REPRESENT RED, GREEN, WHTE OR DARK SPOTS FROM FBER OPTCS. SPOT PROJECTOR. 1--l 1--l LNK OPER SUMMARY STBY 5 CO THS S ONLY ON OF A MUCH LAR AD DST PROG FORMAT PROJECTON DSPLAY SYSTEM FG. 5

12 DSTRBUTON PROGRAMMER *RECEVNG CONTROL EQUPMENT REQURED AT USER NTERFACE MEDUM RATE SERAL 42 FG. 6 PROJECTON DSPLAY SYSTEM RATES , WPS WPS { PARALLEL FOR TEL 4 USERS KSC * SERAL WTH BNARY ADDRESSES ) SKEARS 1 * SERAL WTH BCD ADDRESSES. FS 1 * REAL TME COMPUTER FACLTY 1.._ HGH RATE SERAL 1 MEDUM RATE SERAL t... LOW RATE TTY LOW RATE TTY 12 1 DATA CORRECTON STATON , WPS 3. 3, - 8, BPS 4,5. 5-3, BPS 6, CHANNELS,5-12 BPS DSTRBUTON PROGRAMMER OUTPUTS REAL TME TELEMETRY DATA SYSTEM

13 GB Ji RECEVER TDM DATA SELECTOR STORAGE BUFFER PROGRAMMER COMM TEL 4 SllNAL- FLOW FG.7 REAL TME COMPUTER FACLTY RECEVNG CONTROL H EQUPMENT y COMM... DSTRBUTON PROGRAMMER CENTRALRETRANS STORAGE BUFFER REAL TME COMPUTER M DECOM REAL TME TELEMETRY DATA SYSTEM RETRANSMSSON

14 PHASE TEL 4 CRDSB 1 TD Ms CROSS 2 DP CDSSBs PHASE 2... G Bl TD Ms SPAC SUB CABLE MODEMS TEL 4 CRDSB 1 CRDSB 2 CDSS8s DP PHASE 3... ANTGUA TEL 4 TD Ms l.,. SPAC l.,. SUB CABLE MODEMS l.,. CRDSB1 CRDSB 2 COSSBs DP PHASE 4... SHP 1 TEL 4 TO Ms SPAC H.F RADO MODEMS CROSB1 CROSB 2 CDSSBs DP mt PHASE ASCENSON TO Ms..,. SPAC..,. KF RADO MODEMS TEL 4..,. CRDSB 1 CRDSB 2 CDSSBs DP TYPCAL MSSON PHASES FOR FG RTTDS