BSTJ 50: 4. April 1971: 1969-70 Connection Survey: Analog Transmission Performance on the Switched Telecommunications Network. (Duffy, F.P.; Thatcher, T.W. Jr.)

15.2 MB·English

1969-70 Connection Surv

Analog Transmission Performance on the
Switched Telecommunications Network

by B,D. DUPEY nd T, W.‘THATCUBI, J

(tien. sev! ene 1 ED

Tu charscterve the tensnistion perforimtree aj Am Boll Syston
switshe! teleconewnivations aeierk, Peth elaphean Labororrie:
fervdosted ourvey nf sole vonmertions ding 1909 wal 190% Coe
fettions move sateblshe? tetresn FMC Sistine and offcea chosen
Du clita sanpig techies fath neioy ad data treme
feels were pectoral A fatonry of aval trunenscin perlaravence
[Sguosented inthis paper rats extinaten for nose, es, olet=
lion itentinn, anlage delay dosti, yevk-lonverage soe, fre-
Ipveney flee, Levee rrasking, wontinoor disorder, ond pace ster
for tld att within the Halt System. Aceomponyiog papers divcast
Tata trusavieton cone peroruame gk werora rronde Ueleesh 66 ond
800 Bite pow ace.

Tforvatan rlets on transision perommancs ose] wnection
fe eesercial tn tee ehacaition of tll serviee qulily, wemtsnry “or
osenwiny, the ageamaey of prearst acwistctive and msuntunner
proswutes, a poe i etabahissobjestves Zor new tans
Eon evens afd equipmeat Boll Telspkone Laboratorive the ra
fcet « ninivr sf ryston wick fenatiesen surveys einee 1050
Surveys sande "4 1958, TAR2, ane 186! or eenzgced om the trans
mits sformzce of tod cennesonw (her miro aes sxamined
the perlo-sane of sonic invents 0 porone of te telepone
enter! THis curvy fs leerd en a pvallty eanple of telephone
sie ‘The ore of poobalili sampling premite eetipaton of tome
tnieion partemsange paractetne for the population of a oll eal

fd esines urialive sess al Uhe posi roe i these ea
ales, Ts IMDM susvey aifere Sram orevissurveye by ieluding
fore measstee of the Instissien pererrmnre af the eonneetin,
1512 cu sub sxetime eeousuess sornset, new tor

Frequoney ole, reuio-avernge ealie {P/AR), level trecking, and
fntermocalation end henmonie distortion {or toll corneesions ad not
been maoauru prev ably un sy sine i

‘This peper presente a stetincios surmicy of analog tramaecon
lain, Meanursnunte were made on tall eomnestions fom end fee
(oealswicching offe} to end aoe over in svitebee elecommanien-
inne netwank. Due to alternate routing, and divcrisy routing wichin
trunk yenups, eet hetnenh he seme ering and terminal
ing offece may citer Information om the sharacteristion of Toone,
whieh are xed en‘dee ecrmecting = subseriber wo his loea olen, hax
lean vejorted by P. A. Grech? Connection wetmireraert seul ace
provertad om the susie of wiring dstande ‘yeeen the ene afce.
Teeulls ee separated iat hive wieage eatgorss, ‘The srealdewe
Js show (Q-18) siline wiles], medium: (180 725 airline miles), tl
Fong 726-20 ating miles). Menge eategerise are eemsbined #0
Trovide resale fer the 2opultion of all tulle ius The tre
Inission characterise tevorleg inelaie ike, lose, aboenaalon cle
lastou, envelope delay disorinr, 7A, freqnney oft love tase
ing, rofineas dietovion, and pheee jter, Aceorpanying prpers®
bevide eesulle “or data teenemision error perfrroanty ab wavious
sta lee, 150 aed 4900) ite pov atone (hy

a Geveat

Ae wus aptzent thay to vehi 9AT meagre of he sited
telecorncuniertious aver pecforme, the nirver woul? be a
langt-nale operates exconspaasine the rmotcuncen ot large amber
of tranenaeon ebczaearities ut rang Ua waneetis been: mary
‘ifecene pire of eloes, Sanda thet suis or equ omer ute se “or
inet neiabenaree nv charaeterizion ware availale for asking
thos of tae measnmencent. Tae remaining ton equ pont 6 yur
‘nau, ue desigred ans hui. Considering the bulk of he ts equip-
zn rete bo pears hath analog ane data crane: measure
son's, the shipping involves, and the saanpeva= required ts aauke
tmotuinamiats ak aang direct lees“ong, severe! decisions were nae
‘eearael Ube magne" the p sine ete:

{i Several simamornte wine made from cach lotation to limit
the arecune of travel and provide osporunily for rousuring
ere res

68) Meaumuenta wore made in one

ccetion of tronmiccon
aioe mmaSATsS PmammsceN er)

fox nao chomstevicic, The receiving Joctions for Uns tas
reauinel » Tugs qnenticy of equipment a ery sesiga ol
Prioary leat sil. ‘he cransmstting cede rsquired w rauuk
Zillee anvoune of acupman aa were scaled sonadong
tess ses Menage etelt noise em 1000 love, however
trove mmeaced tr hth dicen of eames,

ti) Poroonnel ane entipment rerun al priacry site for
sgrer bine shila. seoondary tear and eevipmenl movel
trom lactones

Ge} With srvorl eat tee made, sd diferent equipment guid
fr each lly lets wri ran Salama om sevens eat
floor yn thew seal sschee than being made voquctial’y
fom oaly ene Connection ava te

(of Teating eased ete coatinaed for st eos Fall dey,
hic ing jr) to bw an appropriate eonsoremise bebwver
sim reqised to vel to a ste ara set up the equipment, and

(oi) Saficene equipped saunsry (earie were posidad se that
‘wwe raula rave Wail another ested. shus eeoing te peizary
team busy every working hy.

nipnent uses in malting De-Phoo® tcaraniason perfsremne:
veces companion nepere? Anu atte tenet
ne cuuipmnt ie ated Teale

Bathe (or sucping, exch ae! secondesy wet gute fanlos eo
tsa), eeraat of nis oxere yan all 975 ei ters exs e-
Sng 659 pourde. ‘The pres equipmen: was about Ave times Jara
aure Toho 0 primary gusmest arespgumt

ea Tat Lise

Ass fo conmeations moe the ats av thes of teephase aok=
serisore, Subeeriber sw aresrarves cove rareced dneety fom th
ain faean ta the tet cera; fe akan I [ve main tree sed
foun #20 160 ‘etl Al spony “oeatione fie lines wore vrs, ther
for silt roe ots wns “er toxn natin of teste (ure: wise, tal
fa co provide referer gal "ar weal delay maceurements. At
finery locations aie ie tro ie! for cunueetiene Che eecer dy
Inoieises ard Tire whit Tnae save poovicee: ero no far tlre
trporcitee yen lw tireeseanel scrputer for analog dite nie
dents exe ine lor Daie-Pione secies lo tramefer dita tries
True aaa ever naewresy soresst, APR UL

le! eel fom a mall sompecer atthe peierylosaon ve w aise
bommiter ac she Bell Laburaturse Huinale, No, lation; ave ene
he fr norval telephone errs, sed for euninn on saree,

1a Sanepiing Consideration
hn the coulis nnn of TNS repent of the L806 Connon

iow Survey, Ye votod thas tbe euvey exfeed Loum Loo Tinietions

“Lawn I-Connresins Bravny Asatoe Tuasionesins
‘Tumse Hacruaer

Fecaant i Fone
BAD Com Pi Bo} ‘Fane cgetop SF icepine
WHC YA Nase Nawving Ses!" Mate cist ce
fata)
WRCORE Yh Nie Crt ple ees pk ous tise
aun ‘lel haga a‘ ot

HCH AN Vee i wud ney | Shee ua acuaton data and

SIREMMREsiNIG [Sorunnstydntare
srg Ca Stem noe
a

eles Coed, Tatio,
Appin Come

“lay pei PS ipo nls weet wots

"Yates ep expt wi ion taeare.
vais
1816 ace Seth saiegn vacusuUhL JouNedy som EL

wit oot purer: uly a ce ol vounertion,weany tte com
sob be getcormed az eaibration ot arene uit eupales cal
‘ot be verted" Det parsonzel were sezigned to bach ede ot te
Aeotions i the 1968 70 eurrey to erersome theee Hmions. Tis
owaach submantiely inerecees she travel und avec tte eguinad
‘e corplte the purvey. To bring cw sithin anagesite oropurtins,
anoeebuge suing pw on ley al it prvnesy and BR sae
fadery teat eles, Ewoutis of hie wirery reo ah lees een
eteeni th Hele for a nesied uw your

2 Satin of i Se

population for whish inferetion is écsced mem te doled
mvs br enlering a sangle Seen thet gepation, Cheseeesiaetion ef
Ag asamiscing fer toll cexnectone sae the erteen aout to
aie e populatinn Tor aacngling piaposes. The populace wus dened
te all ovate ale: (ol alla eeaatieted hosrzon Boll System anc
‘fies vin the steed teleeonmsunieoue neturiedusing 8 noni
Dousives coy. All wae eegnfied ex a ol ell fhe customer wa
etal filled, Je, he eustove irearrads ave, ited snrshangs
foe pcg vhe'all. Calls oigiotiag or tenaie'ag in cue ollees
re owed yy sho Hall Byslen gece exchuted| om ee populacin,
Calle originating in anal wid afer alea wore excinded ox. the
bass that they ray rot be plana miko opaaeoe assistance, Tan
lungy 1, 1970, 22 of he seyrasinately 14,009 Rell Aystern end Bees

A threnedage simple wich statiteations at the Seat and secand
stages ef sampling wus seleted ru the population seized above
hy estehlichca techa:quse 9! Fin-vage strap ile weve seta
wilh probotiiios proportional tn near of wise. Soeans._ snd
‘hirdaye supe tite wove levi ung aoatife? and sample ran
dane samphag respeasscy

‘Poor tu eelacing tae bret-mage or prin
sraphieecariection wae isposed per Hl gape, nebince wile
Dapseg. eigpercion of fz eazaple, Continents) Uta Sater pine
Oalasio ene Quote (Well Caradal were partioaed_ ine
ttsacn on i ac of mri gig all mesages [AOTM). Tee's,
ech stratum seid save cquu! tote] AOTM. Tne'vilusl sates we
ot aubdivides in aceemptirg to abtory ona” ake pelmeny etree,
‘This tailitted wesebng ue fesl-elage sop my rns

(One Bell Sye:em end etce building wus sleied fom cuck pri
smary euduin, Slotice love plave iaeyaenlly a eh canary

rls is, gee
xyes omANSARSRINS PaEANE si7

eviurs anal wa based upon probabiltice properionel (othe number
fof antl outguing tll wessapen. The primary units selected were in
‘he 12 etioelistea in Tube T.

Unite of che first-stage winple wer designated ag primary tas: sive
forthe unalog tranemizsion euraeterinaion of the voce actwenk, 3.2,
Dllings fro wie tet all erigimutt ard hie weved as roesie=
ing sit for transmiesivn (ely Tle mslallity of each primy
fetving DoteePhone skiers as verted, Ab to er ler
ings st was noted that Drla-Plone cwetmet normally sould be
served. from sn alkemle ur mote balling escuse the offices
Spthin the sunpled bing wore naoeapestle with reper! ty impose
dois Accordingly, ist ee were originated feom the alternate build-
Ings fr Wiese pritary locations, see exe made Som tao cleebl
Ibuliry and irom the altermsce bilsing in gn nf the instances. Toots
Were underway te Hae sles by ng when R waa eseovered thal
DatacPace customer mule wale no: be ers from Ht bling.
‘Testa eodled for Ue sit were eonsleted. Another seive of teste
Inter was trade at the wserene Ing, In be echoe ease teste ere
couductel wily a th alters blding, Te imareverteat in precision
{Ea rot justify the olor required tows: Une sump bnv'leg in adi
tion tothe alterme ui Tha aaraple for eanlog characteeation
loc not enka esol tert lin

Wher ss re ofee baiding containct ufies skh sient types
bo: evitehing Ines mene yorvus ot macetioas established hresgh
tat type ef ee, Dre luile'ng coue'ned ffare havivg panel az

Coesbar switching, Tr eae nese, the apa Zor clog esarvetine
feta includes tontectors steblishee throug the panel end the
Frovstar afites Te sang ior ittePhove shuractenzacien sneudee
Conections eteblished fhraurh the eroesheneffices aly.

Tr the stn tog of sampling, dre ev to twelve calls wore se-
Jeeced from welling te poiatsts compiled the priaaey last
sites compost tbe fringe eaunpe, "hoarse weve we to. deter
thine seeendary tast offers, fe, ieee in wehish che fee: eas tnmi=

‘Tam Te Panwa Tea Looimoss

Seeacats Cot, | Cone Sa
Nethicks Renin ¥
4191S ray men sevnuae cavuou0lL soumeu, sem 18

ibe and which verved we transiting sites for most Urunenisson
fests. A substratioation xa imposed before selection took place
The substrate wore definl 1 the base of aeline itanen, Connec
tion foun O Uo 180 nici wits in kenge were ie Inko one sabe
seratum, Those fom 180 728 nicine alee wore plored fn ee
All remaining connections were placed Into the thied. At lost two
footy site weve selorted in eaeh of the three mileage strats for
avh primary site, Addimal serondary sites wert alerted in ax. etfort
to wpproximte e-wrigiling i ean ealeeatjn With eli-weighling
Svthin susteata,oaeh data point equally represent the option for
Tix salen A tutel of @ sccoucaty see wns selsted fa ta ehort
ailage siraban, Tn Dude the sonia wl Toug nleaye slut, 22
Severn sites woe arlene,

The thind-ege mune slients sere orpested calls origining
Sno annoy sie wd ering i ate oi sei secon

sites Approsicatly ix sormovtine. wens calalishad lessen ceth
Primary ata each of His auciated scrdaries, Meptit ere dex
Sed eb aceount for the este of lloras rab of tll eonnestioue
fd inenonse tho aseselo2 Sel allow eile ab Ube te st
[Ancki enosvisiny lois were cnlurlas 9 IRR conse Delonging
tothe skort aleagseatewory, 227 siya lang wrens, and 206
Tong eoncetions The cor pis areay of avy, moesutennts 3 104
obtained on all so-eetiong eee 60 were protease, Th
fs elves mnay of these dimcineole wore cate sudvertonse by.
survey one pen

4 Sotetating

Personel Pom Rel) Lakorataree performed the tests at both ens
lof the cormestions vrai fe! Cram were scheduled Zor the tours
fssoiatod sith etch pitnary site thtve persone at the primary sad
‘ro atone secomlary, A Yolal of 58 persis peeinipate, Ceneraly
‘ro eeconcry tonne were wesueisted ith eu orimicy? in one ene,
‘thtee tear were roquned All teams ven? taining inthe ec pe
feecures before going 0 the fold. Pgire 2 shows the primary nd
econeary lassie. Schedules were plane tn minzaae travel dis
toner, The testing schol, ne mfid by expevianee at the Bnet pe
sary sce, provides esentially two f0l ys a he his ste ese
Iiy seconay train for thean to become ateustonsed to ond perform
st
1820 rue LL wv weNNSHOML JOURNAL, APE. LHL

the et 7
neetinns,

eeatte, only one dy mse scheduled fo testing six eon

2 Plasing Calle
A testing sequence as hegun in che morning by the primary teem
placing thee tec eas, one ufler wuuther, from the primary to ta
days sovoneary. As aca aa was anwar, & eo words ol eee
Tio were extlawanl to ascnh terooncs teamsmieon to tbe were
sumer, the connotea! wee bela at hata ende (push buttons om the
fanaoles}, and then the primaay esis! the next fost ell With three
‘eat nme ralihel, x ex wae plate to serve ns an “onder
size” to sourdisave the see soviet eo we pled to este
Tish di Unk to che Bell Extwoeatores Hall, Ney Ines

48 Teating Provo,
Afler dhe connections wer asia, testing. wa begun on atl
Lier aad ened unl ve Meck of leas was complete, msiting
bout an four. On one eonmverion w ZOU, daca feb wus uporaied
for 0 sie, fllowert yy 2D) ys da a for che next 30 ss
tes! On enon soreetinn, 13h dala vo was opened fo 4
inure, then 3800+ > BOO Sata te Tor 20 natin ® Tr Lhe
sreonrty tony was ot eeuizped wit x 86OD- or AB00-bje date at
the 160-b «sec woe operated ier an bout. On the third eoanection, the
sequence of analog tcte mas perfomaed. At tha end ofthe tral sequence
of tating, the asignments ef toll eoanection: to the test equipments
swore rotated and tho teste were repeated. At che end of the cecand
hur of testing, the sesignmente were rotated again and tasting on
‘nved until ll testa ad bean maade na each test cennectcn. Whea all
taste were completed, insuding any nesesary sherk or verifoetion
tase, ue ella were dscentrted, In Ue fteroonn, she extinw een
swas repeated, When a otll wae insdvurtemiy ierosnested caring
trating «ow call as exalts) Troting ueaally eonlnae! from
Brak avi fn Ge Hee eenuenor, Art ules etmally was med
‘vepeat the teste made on 2a argial cll but time did aot alwase pe
mit, Analog metaramert rcs ene rv Crom mete ail ia
UT De esheets The voluee wen neil he primary on m peo
printed dura form. At en appropriate time in the vest oquente, the
fnformstion woe transfor ty 8 data magement system,

44 Analey Data Menagement Procedures
‘As mosturements were mde, resulta ware entered inte a dale saeu-