BSTJ 50: 7. September 1971: TH-3 Medium-Haul Application: System Considerations . (Seastrand, K.L.; Williams, D.S.)

7.2 MB·English

TH-3 Medium-Haul Application:

System Considerations

Ry K, 1, SEASTRAND and D. §, WILLIAMS

The mesiunchen! applietion of THAG sa develope to proite on
conceal atvactive spe a wasnt ength oud ees section witht

evintymovpranaispesfocaanee, Pais highqulitytoneniscon

The nadie Grater sees bays ene PAT erminale eo
Ia pant ware ne. Spt i ai
spect Jor th mena hal mention neo

ond ated
val

Tie paper disueses vedic eyorom aehich hes heen mace svailale
te the Assoriatec Bol Spots Companies ve ep ses these denna
‘ar high-performenee cransmision eapabib. It is made up of the
THR IY betoralyre tedio hay and 44 #M cerninale along with a
inet of supporting features, This spetem wae formulated to be &
eile pcg! Unt any enstomined I apes teas ne
within the Bell System. Plesbity resus from the optional use of
tecueacycipleset ciliary channel a one-one haschard proter=
Fim svitshing craton a siglo rsnsenitingrarsiving ante, and t=

tee af storm ta lyse for equiniant, Ties featunen ealeeiely
Misting Ie aeedinchan wereye ns Thal wl'si i ‘eyally
‘ale! Tong or st hel

Teste ofthe ifelly establishing a lel for the ainda)
syste since he aisle! apiienians ane 30 eae, HOM,

sU0-cinesit spetemn motel [a8 hope with bere eniteing =e
tions) Tae wen sleet}. This ebser veptesens @ reasmale com
promise Telween the 4O00enide lnvz-hwul meird and the 250-rie

hortshas! model amd will fe wel ta eseribe noise el reliable
periormase Pic spouse thr Iseeay mbility ebiceive
2272 cee nent smn somes ZoCUNAL, SHEYTRIEER 18h)

(002 percent ans, depron how the aplione are exerstod, has
‘noise perorinence falling within the range from 383 to 38.0 dud,
Extrapoasion of pesformance eet (notes areangenats is eratively
straigilforsaed

‘The cevsloyment of sa overall radio yam suitable for macin-
length sant seaiar-eros-zoti apyections hee resulod in oe
at some existing sisters, che aéaplelion o° others, and. soi
omglta'y new designs, At ie ant sf ho rio ysten ae the THB
anemiter-ren vor In and ta BVT tonenalas These ars used
fcovrtially as oririnaly designed, while the ower pent ane che
‘iléings are existing designs wih rite ome edapention for this
pplication, Such items a8 the B00A procecion switshing system,
“he EB status reporting and lar <ystem for mudium hal” and
the frecueney plexed suxiTiary ohana" incolved furaments design
‘york st of wien wis sinned by the medit-hnul application

"Wigire 1 ebows in a seplifed manncr fae eswnlins of a nedinm=
taut ‘PH syacem, Main sation, whieh are the siting section end
Tks, ee exarueceria ly ke prceenee of buseband sige, ‘The
008 protection erching eyerea shown iz Fig, Lay beat in
feanion or it aay be pyeiealy related from sbe ri sim by a
uch a eight milce via wise Ene extranee lik, TT Tie sysiem Jae
nies more than one Laden avitehise section, 9 haekstoedaec pale
ff main eacione exist al the junedon of he wvitehing soction.
Fepeatare are chararteriaet Og the dnet that Ube Ung signa) des
not go through an FM temodulation prootee; threfere, with the
exception of tlm sinliary shane! signal, only RE an M0 cis
fae preeut a repent

"The collating parareshe briefly cover some of the sien features
ofthe bloc sha in Pg.

2 Hose Fennsuseson Bonet

“Dhie euipunesh inehe tee entrance Tinks, FM cermicals, and
TLE teuneirerevives bays, Stara 3A wine Tine enzrance bk
gin and equalizaion squipment and 44 FM teense exe uaod wth
fodhum-halay-len, At with tho entree Finks and ¥ML tonsils
the TH traneniteer-reciver bay Je Wentieal Jor bots log aul
suaati-heal eppieations
ars
220 ime men erm ToemTENs JOHN

sa Bows Pesivson Suite

Aum soli state polenta etching syter, deegnated 2004,
tan len cevrloped to prove & azefor-one boo hind eeiea forthe
srstason of meeaige stews, Peston Se provid Yy-moisting
SruTlarenusly she xo sedlo wisnnek av the trusting eof the
Switching sulin AIl swvitshanz io dove at the secsving ex! where
Ihe channel ronitons,antonatie lagi, a cantrale are Loew. The
Fompacatively igh vienal handing expueigy uf (he ewiteh and its
Tow foes promt tee entucee Duke an PO terminals to be Tnoluded
sritzin she nvitehiag 2c".

2 Aoailiany Cire! Ponty

"Dhe fiequeney-iplesed austisry shone! isan inband (over the
adie) ceanenieeon lusty with sete a) eel radio etadion. T.
tneratee abuse the nore 1200-<irem payleod signe) in aareow
Baad conned st 1138 Milx The hasie susiskry ehumel errangee
thon: his eflable thse: yewsejuerey zeus. Two of ‘hear
Srould normaly be wsed bo eary onfer wise snd alae: Hsdomation,
the thied ein availble for otber vace. With addtional waltipes,
Up to 48 cireats fur trusking my se provided. These “baelnal™
Fivwite are intend! ve ravine soiling frites from a eadate
ole oestion, neue a reper eetion, to % point whece thy eld
dave eoess to the Bell Sonim networa, Whew 44 PME verninale
sre ne te auiiary eb will have a nese performance ixhly
qual io cal wf shovesheal radio (98 eBened sor 10 hops)

frooss to the Auslaey ekannel ie o-ciphifoewazd at veruroa sae
tions ence te esha! ofgras as poeee A erate stations @ 4A,
FFM secre i bie on he LE signa) pl The FBT receiver en-=
hl hen provides signal thie mag ho ulixod without ay Smtr

Fee to the 1800 cies ty the three pth. To edule adc
tional T1ReMHLe indentation amin. the yee a uierextve ER
Iovdetor in vlan in tandeus With the riewwawe gees sin
focal ost lator ving the aypeatesUranenivar znadulcor. By ths
nets, seco te The ito bared Js table at 2cch peace

inet the suiiary channel caries alarms informacion, is impor.
lant Sat transeison by ihe rae, For zis reason, the vuiliary
‘Caine bes ite awn prewaion sing, ayatem. ‘The eguul is Fa
fver to RE chornels; re cash stati az the route, the bu!ser
performing RF ehanzel i elect
SPILL arco 2078
24 BY Stetae Reyarting aot Cant Syston
[At the time the wnedinm-banl sone sas bein este lsh
saminatios 6? exiting aleen repeting agate ceed Cem ether
fe have eavacity for too few arms, nliestions, and anders, orto he
Tyseas 100 Tavs and cxposive fur wevtutenl DRsore In
sition, the de woltgns sees iated with the peer reir for these
ystems wae oien nol realy available at ene cba nalts

(ne ofthe avalos ensiden wie the reve developed #2 satus
reporting sl eomtraleyetota, ea eli stete cig syston which
finches data tenetissins follies fe vse on stanlant sole etane
‘pe. Although in ite exissing ealesiaeas is wan kaye na sty for
‘the madium-naut purpose, st ‘aad ow designed lng lylne
opeagch Stinssted the soediumehat nee» lied version of
Ue El apateu elle £2! wie develesed, This soined version ei =
raced the bie encore ell thse poeviousky aeupied one-hit
cf the bay, and beoke dawn she groupe of lars, iaietione, aad
tiers rte taller phages,

‘The meiiatn-hat” nets involve approximately 12 asdeve and 00
ined slurs wd dioations at eh stion, The Sina emote
2 parkeage hides tis eapvity wit room for ited grow’
total of 32 oners aul 128 cexcbined clare ad misations, Capacity
to grow to 256 lars and indctione ovals hy ating sll aout
ft hardwane. A epnival P2 alan for uve with aac ha a eone
(tol p to 64 remote stations. Lach of those remnte station spelled
ty the cate stetion fr the satus of fe aes

"Te 2 packoge allows wdiumebasl sytem to take aventage
Df he Talos iv sesigne sad elves thous smearing the lange
Fapense setaciatad with stats svoorling and cartel ayeems tlle
to anges ness

sae Povabe Yost bupment

Tualicstotions ho:sing edism-hea! TILA syatans wil Grhentae
Ive as fow ae four tranarstter-reeiver ay wong with a liad
somber of hays of supporting souipmet, This fsx smal fesetion of
et the coal actin uf qurseest oweed ta type hinged
nigh satin, To suiimite the eost of rest equips for weslia-haal
Fontes nee f portable test wsiment I+ eeconamnte Chie tect
‘syugment x command promovity of commercially available tou gone

Tronese in Sghtweighy srcases wel ear be essby transvonted TE

vray be sored al a eerteal lsttion, ate a= ¢-auisienanee station
22th mp amu sR SRreTTEAL JOURNAL, SuBcaNEN 17

fr alaan eantrl conte, from wbieh it enn be taken co any station
that requtee testing, Us of a Kanes umber of sets of the equip:
vent, depending om the length o° the system, can drasiesly zee
the Saves, fy eet onsipsnen, compared to soairaining compete
{ed test capment st each sudo sarin. Sooh w proeeine is pere
rritsible beens 0” ihe Tong test interes (hab ave expected to wpoly
to both the TH eauipnent ae the seppurting eat

A featner of tho LIES tensemistarrecerver Cat holps make the
portable eonnent stzuetive js he abies 20 replace way eampenen in
The toy without reqring invweite alignment with test equipmesh
{Ts rate, wasn upp ee on a lasted eis, Ml usa in aul,
lia impairment we system peeformsce thes prcise alignment ean
be postpone until eonsenieat.

The skotosrssh ir Fig. 2 exrms «care that permite stacking o the
leet eeuipment “uring saintenanee, ‘le te gear shaw: te pst
yeauh ‘e eapable of wuaintaining the TLD rio boys with virtually
Uw sane aneuraey stisine with lost equipment dadiented tos
tion, Sevsta: aciona, somanaaly evalable beat ete er use
fonjuvetion with sh sintenaune ofthe Eusdiary euanne, ender wire,
alae, 04 power equines,

ss Buln! Shaiters

“An ecinient shelter eoneep develope for sent-haal radio may ba
sod. Jor aeshunelaul TH-3, ‘This reneept provides fur factory
ieee an lets vaio sngmaent wih a nnn. of fel instal-
Tasion Amicon "irk bos” tye structures ne aah ly hes
lw radio equipment. Several deren Lengthe are nvsiahle depend=
fag on anseignte priarh Foe a rac apstea Gib cop where a
ined ammount of a"yment ie installed wh a sini ©” wpe

witfestios, this type! seller proves very Peonamiea bung,
1A bey pivoting srrangenent was desleped to pera mownting Sho
ipmrd gait the belts wall ant abill alow cint=ance fom,
Tah sides of tie ay

2 Lover

‘The unin soiree of paver at mesEornchaal statins ie a -BEvelt
hottery sowerve plant, Small amounts of power a: 424 vols are
Indicely supplied rom the —24evalt plant by: vollagr eowverer,
‘The surent dhe is at a typiea, nopesseretetion is 85 ames, with
a cecomnesld batzery eeeerre of ubout 88 hu. The TTA poser
Mle speeded for shoe sysiom permits cme altematives:cither

2278 uh BEL sere S1eHSIOAL JOCRNAL, suNERER 121

rectifier which operates from three-phase primary power o> a nem
Aeveloped 100-anperesinglephose retier, The rngle-phase rectifier
ip neensany sige sort uf te rad stations will be remoaly lewied
Sram three-iee anos,

2 Busronmonta Li

"Po ralacs builing cores for mediom-aul syst the eqpment
belies (oF sell bllsings for hat mater) may nol be alr eon
itoned, bal ens and hessere might Ihe eeguired depending om Joe!
flict cond ious, An savaromnentel tazpecatice seg’ of AO7P to
20°F opus esac for mern~aol xylem, a range woh ca
ine maintsized wit ais ending in roel aeas. Tis wll ede
Inling east. Pesforsaance of the enpmen.hor bees estaeed to
‘ue abitsetay over this range

11 Geeat

“THA maedium-taul syste provide & vele boreband of up to
10 MBs capable of varying 1800 meesige reise other broadband
sorviets With the ssniliary channel ane S008. prolortinn ewitshing
Sole con muity pot, te Deeebanc epectrue of mvetinm-kaal
Eaton eovtains slgnshe fws'ng fequendies tar chon Uo 1800
Greut uvssuge paglaad, The frequeney desietion of medium-hast
‘tems fs Uirelnee teiueed eeinpared to Last of long-haul aysrms
that the necessary bundoill of the RE sigoel will ze exeeed
the BO-Mle authored tandwvicuh ss specited by the VCC.

8 Rabat Space

‘Tae composi Wrondbann’ baseband wxnal that ia eppied co the
PM transmitter ie shown in #5g. 3. Power levels of the componente
fe ai shown, Part of the fesebant spectrum ie che 1800resege
Tareait ood that merival t0 thet of eho Tenychan’ anbeation
xc ois eke! tw. ower A continu pilot wl is ured by
the 3004 ywotsetion exizehing ayeces appans al 1188 MAy. The
furiltry ehanzel, onsising of a deuble sdaburd AM si, aneupies
fhe frequeney band feem 1.09 MH to 11.07 MIDs wit the waxiliesy
‘hamnel subeavrier at TLRS 3a,

Temp bani CBU) oe oe he FE ase — a high
eR T ghana Bibel eaten etn,
MeDteAC-HSt, spputeantos no

r

obs the nea

Fig. #-tennve toe snc ron xt Mme ap

mmolictely preceding the FM tronsmittar, che auxiliary ehannel
ignal ss combined with the orhor baseband sigaals shh 4 eisive
fevulining wetwork ve sw in Fig. 4, Brose (he total power of te
sid-raasage ctruit Ione 38 significantly ges:cr thar the pater of
the auniiaey evan sigal er of the entity pilot, the syeem's
tated Sregneney devant eee ntally woot! by the power 42h
TeGD-cieet_ ee 280 uF power of Une Tre cond
he ap aide af the eomiieng network ts ientiol ta the total hese
Iaaal unser deivesed to the FM teemaritier for longehanl sppliens
im! Te Snesron los of thie netwarle rduors the. Sroueney
dsiation of the L8OO-ieni load by 48a

ave om the inves in Fig. 4 the mis frequency devinion of tbe

ig Sarl ambnig tek ud poms lve
2980 rp anu avarns¢ MpeMIeAL JOURNAL, SMSO 671

‘various componenis of the baseband signal may be ealeulated. Th!
tte shown it Table T. The eoesponsnt deviations are then added on
{A cootemecneequare isis wang in ¢. total as Frequeney deviation
(O° 685 eH for the eomoosile edn sar

TBroedb! tnem igra's GC. a8 oopsidere: Tne Dave thee peek
Inusioney deviecion reed 9 the me frequeasy dean by 2
18-dD peakesn-rmne power fusioe* Thie w20!s in « 310-MTs peak
feameney deviation for tis wngwsite wedisn-haul eigpsl. Appliee-
sion af the dedntion ine neweery bandit viel

fa — 208,10 MIDs) + 2(11.88 a1Ha) ~ 40 aUMe

nu Chases: Devsaniase

{iGunatee sina weg l,m vain ay

SPAT Ae ne vet a t
EGA [uti onl alvin ori a os

TOTAL WMS DEVIATION is hele

Sace route eeimmy is & olor comiceation with ee TLS
snedanli! eppleaton, the nso of a singe cena for transmit
fo and eeeiving frum a. gen divertion is romonmended. The bere
Tefeetor atau is prefean’ esas of ies Kgh zi acd Airetivty
‘ut dest feed dual polerian ion paeshabis vdiators many ws be wed
‘New routes wil generally te tho single antenna approach vive eon=
Ehtoablc eore savinge result (orn sieplifee ‘owes, warcauide, nud
building sr ge nents

"TWH sahil eystee moyen We edged to eateished
46H long-hul soos here exieu bilingy, ters, and anensas
tov available, in whee eae separate toanamicine ai! een
hniennr woulé be use

441 Biv dndena Frequesey Pla

Pe chavs. feequenties availabe for mediomhml systems are
iersinel to tacee tr able for logshav systems; cuts, either #
regalur cr slnggeredfeauaney slan nay be vsre Having a choice

a Raph ri pied So the PC Raa Regains fr
cada retary bm