BSTJ 50: 2. February 1971: The Picturephone System: Customer Switching Systems. (Breen, Charles)

8 MB·English

Customer Switching

The Pieturephone® System:

Customer Switching Systems

By CHARLES BREEN
(danas ected Seyaber 15,170)

Mony customers for Picburepone® serie wil ikely be business ond
industrial exterpriee, basing PE, onto, or bay tlepbone version. Thia
fpeper discuase atching sytena for busines eucomers, and desoves
how Pieturephonesercce mite eed as a natal extnaon of tlophne
tovvze. Tit paper ala coer ab an intrduction fo the detested popes
Tokish dovorite each of tha customer evteking eytem Wicturophione
arranges

Customer awitching speems fornish service ve Uell System cio
eon in very besiness entry, Sh ster rags fa saw oma 2)
{ie or Uw Helephonee ta ny thutsande of exteason celephones
Because of the potential value of faceto-[aoe communiestions ‘0 busi-
vest asim aelitiee hue on role neater That cbey eae
silscribe to Pietuephone eorsioo as putt of eustamer sling system,
‘The customer switching ealegery inlules several Ynsin tyres
vervice. One type, known as Private Branch Exchange (PBX) wervien
i oblained irom amitehing equipmon: locatod oa the customer's
premitas Ib permite eonnestiocs to be ae: up quiekly between the
‘elophone user et the seme busines leeetion, without the need for con-
rnoctng fo, and awitehing through, central efor. PBX ayatame alee
permit the curtomer’s employees to place end receive calle vo and
from the central afice via ewitehes which provide a form of consen-
tration when fever contral otica paths ave neaded than customer
‘ations. In PBX servie, al alls from the canta! cfc, and some to
‘he exntoal ofise, are completed with th ait of the eustomer's opera
to, or attendant, who provides many wail rersoey seh a wei
calle for the eonoem and circoting them te pkcieular empleyece,
Siding in the plaving of vtgniny cally and acrecning thet whe
664 cue mL evame vesmaca, souRNAT, FMICAR 10

desied by the cuslomer, Figure 1 shows 2 moder attendant’ posi-
tion arranged to handle Pistureptona serve.

‘Stull onstomer svtahing complexes whieh do aot require allenant
ids to the extent desired in PDX servive are very numerous. Key
‘Telephone Systems (KTS) are used to mrt sudh customer zequire-
vents

'A thine type of easlumer switching eervee, cele is a variation
om PRX orice wich hee boon mals availeble in the past dsende
With one Zona of centvx service, ealed eanizee-CU, steione are
served bp PBXtzpe oquipmient (ow the customers premises), and
elle ean be direthy died fo axy other telephone inthe exchange and
tall nator wih the iemtity of he ang steion soeordel ab the exe
ange ef tall ewizching ufise when requeed for churzing purposes
‘Ako, ioming calls ean be éiretiy dialed to the station without
Attendant aasictene, Howrver the atendant is ell retsined in een
Tnex ezvoe to handle elle cirwln la Une ain nuzcber of the busine
rursern op to render aeistenes on ells that need to be traree
Gr requite other apeti alletion. An equipment veraton, eerally
Thrown aa eentter-CO, coromplichce exenlially the same earvico by
cvileing estore incladec in the eenczal ofee ewitebing equipcent

ol

In edding Pietwrevhona aprvie to customer setahing systems the
objective ane bran to rake the nev perver pear to ce eneecer as
fasturaexiemion of teleyboae eoreet we, lo yraside means eo thet
“he action require hy slatnn sass or attendants intite, resi,
fr exiend Pichurphane alle i sompatile wth the operation per
fevtned on ordinary chyphone calla. Ia Hine wih chic objeutive, ano
sner enitehing eytems wilh Pisturephone corvics havo boen diana
{be consistent with xenorel aver principles ‘Thos include cho
ality to uae common ston emuipment and common telephone nur
Ties fe both telephone wad Pciurephone valle, with che Peturephone
sreching function brooght into play theugh tae ue of tho denying
“B pred generated iy the 12th button oF # Towsh-Tone® stetion set
Treluded alsa iz tho Picturoplone mislamer evitehing eystem design
su divdnelive sguel on incoming sll, evcatd iy a new tone Hinge?
{Av PBX, eentoex ena Rey talephone stations and also by w diesineive
Ihugp snl on key irlepone stations,

‘Asie the ease wilh non-Pletwephone custamor evitching systems
niver wpervivion in returned by the attendant or station, whoever
‘answer fr aed this cunses charging to begin and pessstchronghout
the esll at Pictwrephave sates, Incoisig Psturephone call a canto
service are preventad from being dzeetly completed co non-Picture-
‘phone stations i onder to avs watwanted changes. However @ PBX
Os cantres allen ae complete Pichurphons valle lo 8 aou-Pieture=
phone stating, if slosird, Sin ler'y, etacorns iifat) transfers fanny
A Histerephone ln a simePlelorephone slain are pose

When Pietsrephoveecrvve ie Famived ly ecntnexeeckiog eaiye
rent on she eustomer's proms that pquisment murs be asrange! for
avcoustie identifed cutware dialing (ATOD} and must heme on a
central olfoe equipped with local watomatie moseage ascouating
LAMA) equipment. In similar mann, when eennex servi ia
dosived from central ofice equipment, the central office must. be
quipped with AMA, The use of automatic station identification and
TAMA ie tequived since fe not planned at present to roste Picre
hone cals via a eon:ralized eatomnati maneage aeounting (CAMA,
fre wither for operator Moutseation ar evromatin euarge ecuring
96 een mms, sxe Mme JOURNAL, FeaKUAT 107

Sings there aze a numberof stardard eysteme that provide customer
svitehing service, i ne neoeesry Hee to decide upon those mysters
{hak sonld be arranged for Peturephone sorvive, und the general mane
‘er of incorporating the video capabilicy in them, Sywtems were chosen
Om Ue basin of having the mest solentil use for Pctnrephone service,
Considering both present and future eustomers, Tho manner of adapt-
ing thom-—or the question of adapting them atsll—beeamew fnetian
of the nature of the system and the eoonomien of accomplishing the
fonetooe. Ln Vis conmetinn it aboulé be noted thet no etorpt hus
toon mad to provide fesilities to serve all sation of large eutomer
fnatalations since itt judged the those euelosiers woald not clea,
te Lent inal, to subseribe o tha cervice forall of their emplays,

‘Pishrephoneservive a been adapted tothe 701 step-by-step PBX
setem which preety provides PBX. end eeoles service to a lnrge
rnamber of Dall Svclem curtomere, To minimize modifiostions of
‘eisting 701 PIX ystems, an eusilnry ewitehing arrangement, the
‘SOA PDX? has been developed which is automttically called inka
te to handle both udio wad video components of the Pleturephone
lose generated by, or defined for, stations obtaining eegular tele
‘hone serve fom the 7 PBX.

"The 767 PRX system sopreeonts one of the Bell Systems newer
packaged eossber PBX systora whieh oan furnish PBX wel eontrex
Eerviee inet Iteuoe bse been slowly growing, it too hss boon made
fapeble of furnishing Pieturephone service. Designa have beon eon-
‘olideted, and the S50A auiliery withing arrangement digned for
‘the 701 BUX is also eapable of funetionng in w similar manner with
the 457 PHX.

Pizturephons service eupabilty as also been add to the Na. 101
Dlaeceenie Switehing Sestam (BSS), presently the Bell System's tos,
‘otra eustomer etching stam with zepedt to rage of metorner
titer ard verily of ecvion festanen, An deveribed ina companion
tile, any one ofthe family of switch units comprising this system
‘an be arranged Lo provide Piturephone servos For thie syste, the
‘ideo component af the eorvive i handled through the ure ofa wide
band awieeh unit controlled, va the eudio switch unit, by the stored
program information inthe entra unit

"The No, 8 orwsbar asters haa boon axrangod co that Pictwrephone
ccrvice etpubilty oan be anda available to eentrex.00 lin An op-
Thonl wideband reueta snfeh wolrolled trom the Pictwrephone
centol ofc oan be uae on the customer's premiesa? Ae discueed
Coston ewernasn weSORAE 7

in Ref. 5, not all conte feuiures will be available on Picturephone
calls until g later developane. The No. 1 FSS will leo be arranged
forthe service ata ater date
1c was found that Picturopione wevine or KTS customers auld
bo mone eeonersesly prowl wil n new system ener Ci Ia
itying existing yslems, Aecordinely the 1P2 system lus been devel
oped for uve where Pictwrephone le talephore eave ie deeied* The
1P2 systom enn alao bo used at 8 aeparace ety “0 furith Picture
phone servi fo PDX. and oentrex et
sol jutify medifying the major speters
‘igure 2 ilestrates the ge
lo the systems just dieeused

4a Gera
To develo
Pictweephone er

be buen thit the veka ientures
in the diferent PLX aad centron eystema be consetent with each

customer operuing features for PIO an
busi pre

other and coméinato ath the “service package” concept curently
nwierlying the PEX and eumizes makeing philosophy, The latter
snes thet eck ef the Zeatnns yi ret lophome service sere
wll bave, to the euenl possbie, a worapunion via Fetre, and Re
featuren will he aptionally evailahle i» prewps, ur individually, to
feomperert he eegu'a trephine serview clos at individual op
‘ions, espelivey

‘Teshnolopeslly, the video Sentree ane of interest primarily mith
respect to whether Ley ara mation uses anented or eau orate
{Gn which exee they genere'y alfet the station use~ lea). Aoound-
Ingls, the seacures wil be sous fom these viowpoiste

442 PBX and Con

‘The besio sommuml
cc: communication wih avother inside sation aad comzzuniontion
with sameoue outside. With Biterrghone eerviee, video capcblity
willbe present ex dirsely dialed ini and outside ells ny wetsuit
forward simple manne PBX and weatrex eyatens ave seed 20
has de digits dialed vo identify tho ration, either om a inside call
for'when cata fram ovtsdo, on bo the aame whether the ellis made
fn 6 teephove basis or on’ Pleturephone bass, except that an

salen i fo poe Pstceoe only mein comes
sue fr Blttpons aed leghons sumoat uf cosas tal foe

‘cosmonge asrnoane exams 89
Pictosephone eal the sation number must be prewaed by the iensi-
fying prefix, Ifthe station number is preseded by the af pref but
tie eal ie for a non-Pisluepkone statin, it wil ba routed to 8 re-
‘nied annommeement to neo tnwanted chengee. 13 the Picturyhons
slalion to which tho eal is dreete i in «hunting group with other
Picturophone and telephone sstions, the Petureptone cal ll hunt
twat only che Paturephone line i the growp, A Pcorephaxe Tne wil
ppesr busy co the eystem for subsequent Mzturephone an :elephone
falls inns on either typeof eal

'PEX and cealsex alalion fetazes involying transfor functions of
foe Kind or anvtinee rs in ome intnesting video servis fetures,
Present ayers enn aeennglish a miraber of variations of the tranicr
funo.ion, euch viciion icing comewhut diferently axed depending
upon the pon a Ube eal able do fauetion acours, ad the deta
of the function, Not all eyatems are capable ofall variations, In zens
tral, the wasefor function can eocut (2) before the eal ie menered,
(i) the snscent of answer, or (i) hile the all is in proces
‘able I shows tabulation of tals in these oatogoris, together with
bot daserption of the lelephone sevive nnd the ve couslenpee

42 Atenas Pestree

‘The ability to have an operate: or attendant, eesti the bunling
‘of wally foduanenial co PX end centre ervica wad peshepe i 0x0
of tha meet important features. An attendant ia an employes of the
tustomer sa, as such, funstions aaa "zalepdone reecpionst” portray
ing hor compan image, Lz the development of Piturephone carrie
for PX ane eantrer customers, provision nex bean meds oo that this,
concept eax be cabuaced where desired by the customer through the
‘vo video phony for the actendant,

Te wos decced ta provie attandant service only with eonoley nue
fr Ue ove alunen in Pig 1 since they wl only repreeet the modemn
‘rend, But the alternative ord switeabonede—would be wansostariy
‘cumbersome to implement ned aperute. However, or those erating
Inslallatone where eord sileiboarde areal, the terres ean be in
plemented throash the tse of cn auxiliary coneale for handling Pic
uraphane calls only

‘Wilh respea lo console operon, the abjostires have been (2) shat
the attendant perfort the same relative fonctions an Piturrpione
relic on telephone calle ldo nl presen standard conta, and

procedures bo Sdenteal with, or natu
felopheze operating procedures, ‘The
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