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DATA SET 202
TRANSMIT siR-RECELVER EQUIPMENT
FOR FM SERIAL VOILCEBAND TRANSMISSION
DATA SYSTEMS ©
i. GENERAL
Connections to the customer's equipment are via a cable proviued by
him which plugs directly into a 25-pin KS-(9ic7, List © connector
on the rear of the set. Signals to the custo.er over this cable ace
designated Received Data (RD), Clear to Send (CS), Carrier On-OF!
(co), and Interlock (IT). Signals from the custower are termed Sena
Data (SD) and Request to Send (RS). These inputs and outputs to the
set are in the form of direct voltages which conform to Electronic
Industries Association (EIA) Standards. These standards define space
or on as +3 to +50 volts de mark or off as -3 to -50 volts dc.
Exceptions to these standards are off for interlock which is ground,
contact colsures in the customer's equipment which indicate ready
for automatic answer and provide remote release, and a contact clo-
sure in the data set for ringindicator. Frame ground and signaling
ground leads are also provided as a common reference.
The transmitting portion of the set is a modulator which converts a
negative voltage on the SD lead to a 1200-cps tone for mark and a
positive voltage to a 2200-cps tone for space. A positive voltage
on the RS lead turns the modulator on (1200 cps in the absence of
any voltage on the S/D lead) and causes a positive voltage to be
returned to the customer 200 msec later on the CS lead. The receiver
portion is a demodulator which converts these tones back to plus or
minus 8 volts de on the RD lead. Receipt of either signal causes the
CO lead to go positive (on) after a delay of 50 msec and remain on
for 15 msec after the signal is removed. A clamp on the receiver
output is removed when this lead is positive. This clamp or squelch
is also applied for 80 msec after turn off of the RS signal to block
reception of echo return.
Declass Review by NGA.
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al @rctease 200: 2005/05/20 ; CIA. Ro pgtip0 4002900070002. 3
BELL systhP TIC. SECTION #4249,002
gol
Equipment Engineering ay Standard Issue l, N vember, 196
Equipment Design Requirements “TATCo Standard
DATA SET 202
TRANSMITTER-RECEIVER EQUIPMENT
POR FM SSRIAL VOICEbANL PHANOMTSS LON
ETA SYSTEM.
als GENERAL wd tee tte twee
oat Get sa ‘ :
s2Op|e per atdre mob : :
BETS cod se ERE bar
1.01 Tris sperivice : hi picks. bor :
Supplementary stoned deed f. rot ‘ ' ;
in, covers the equi : patie - tata f eA Cs :
ments for the framexorx, , aT fontaine an tnt ‘ roeis vat
etreults to be used tn ‘Lure 4 foie intend : oy
installation of data s S wit: 2 te vat
nediunt speed ©. sertal} : ‘ eee Ay C “s ;
Titan oe 5 ” ee fax WHHda - aes eer Y , Mi ‘ .
re SQUIONELT 25 pyr a 3+ -
DATA-PHONE service. vait aa .
vertices
bescription
1.02 Tnis equipment is intended te be used 1.49 My a rey {> ae
in 2-way FM data transnission systens : Raa 4 239 ares
ryt erp ce . Vipige ne : ie
over standard sh telephcre FOALARY on Lhe Ob ae et tobe os
factlities or + 3 : Dor mar ¢ a, ate ‘a
facilities, th nr: 2 tone Sop space, ae i ore aT
duplex in tha s na the RS lead turns +h wctien tay ree,
receive but nual ne Pereiye epS in the absence of ouny voltage ante yy
er porticn monitors the transmitted data ros lead) ena oauses ver sult age :
the oustomer, F duplex operation is returned to the °. a A aA
possible on 4-wire facilities; the set can the CS lead. The Popaertdon be 4
transmit and receive simultanecusly. Trese demodulator which Whese tones fod
sets are designed for use at bit speeds up to plus or minus Ped tae eee a
co 1200 bits per second on switched connec- Receipt of either signal causes the 7 eae
cions and up to 1600 bits per ser-ond or.
especially equalized fixed connesticns. The
use of asynchronous operation permits con-
plete flexibility of the bit speed.
1.03 Connections to the customer's equip-
ment are via a cable provided by hin
which plugs directly into a 25-pin KS-19067,
List 2 connector on the rear of tne set.
Signals to the customer over this cable are
ae Received Data (RD), Clear to
Send (CS), Carrier On-Off (CO) and Interlock
(IT). -Signals from the customer are termed
Send Data (SD) and Request to Send (RS).
These inputs and outputs to the set are in
the form of direct voltages which conform to
Electronic Industries Association (EIA '
Standards. These standards define space
or.on as +3 to +50 volts de and mark or off
as -3.to -50 volts de. Exceptions to these
standards are off for interlock which is
ground, contact closures in the customer's
equipment which indicate r for automatic
ier and provide remote release, and a
closure in the data set for rin
r... Frame ground and signaling
eads are also provided as a common
to go positive (on) ufter a delay of ol neve
and remain on for i5 msee after the sienal
is removed. A clamp on the receiver output
is removed when this lead is positive. This
clamp or squelch is also applied for SO msec
after turn off of the RS signal to block
reception of echo return,
1.06 An automatic answering feature 1s
standard equipment, This may be
connected or not or selected with a push-
button by installer option, In response to
ringing, this equipment sends a l- to 2-
second-long mark frequency tone, 4 to 5 sec-
onds after trip of ringing, and then places
the set in the data mode. This feature is
under control of the customer equipment via :
the rea and remote control leads. A con-
tact. closure mus maintained between
the remote release lead and remote control
lead by the customer except Tor momentary
interruption to terminate a call. A con-
tact closure on each ring Age is also
prevened for the customer on ring indicator
eads.
1.07. The’ ‘TEST button operates a test
whieh locks up under control of .
te test center. This relay son
nects internal circuitry which pera’ tae
test center to measure mark
transmitter output level
tivity, and to verify proper n
the input and dutput conneettions =o che
customer. With vecéeiver ay :
the cradle, depres
release the test 3
the line. ¢
1.08 De power
supely wh
eyele supply.
3-prong plug ha 4
supplied with the set,
Watts are required.
1.03 This equipmen’ ts Qesigned > Speerate
over 4 @ Be ot
120 F and 2
per cent.
Data Set 202. (See Fig. 21.
1.19 Since the telephone ana datz ~=quipren-
are mounted as single unit, the se:
is called an integrated datu set, It is
equipped with a Dl19:-61 cord fur vonnesttean.-
to the telephone lines. 4 é-plece cycolac
housing encloses the equipment which is
mounted on a dark grey, moulded Fiberglas
baseplate. The front housing contains the
handset, keys, ringer, terminal strip, net-
work, and dial and is a high-gloss light
grey. A dull medium grey, rear housing
encloses the data equipment. This set is
equipped for use on 2-wire lines only.
Data Set 202B (See Fig. 2.)
1.11 This set contains the same data
equipment as the data set 202h,
except that the telephone and keys are
not included; in addition, it contains
facilities for connection to a 4-wire line.
It may be used on 2- or 4-wire switched
voice line by connecting a separate tele-
phone set. For 2-wire switched lines, a
569NB telephone set is required; on 4-wire
Switched lines, a 568HB telephone set plus
a 4-wire line circuit is necessary. Line
and telephone connections are made through
a D24B cord. when no telephone is required,
the set is furnished with a test key mounted
in front at the lower right corner. The
front and rear housings are separate pieces
and in the same colors as in data set 202A
but are fastened together as one unit.
1.12 When a data set 202 replaces a data
set modulator 3A, an adapter cord is
required to accommodate the business machine
cord to the jack on the data set.
: e
SEoTION aaswo.ove APP@ed ror@care 2005/05/20 , CIA ROG 20477MMB0900070002-3
2. SUPPLEMENTARY INFORMATION
BO-LDOSI-OL - General BEyufsment Reqalrermer
af ge 13 re wanate
t nig ae
‘ 7
=-+ ie ie - at
saan
ae
A Set
ee
rireul' sy
SD-1LDOUS-7.0- lat fet
SD-1LDOLY-22 0 - leit Berton les
SD-1DO@0-4i - Line cing Sees oh ta EA
equipment
ED-1DOOs-( } - Data Set @0e. and @oek Mos
ulator Printed Wirhne fir:
Assembly
ED-1D005-( ) - Data Set 20¢: ana 2028 De-
modulator Printed Wiring
Board Assembly
ED-1D006-( ) - Data Set 2024 and 202B
Control Printed Wiring Board
Assembly
ED-1D007-( ) - Power Supply Assembly
ED-1D065-{ ) - Test Switch Assembly
4, EQUIPMENT
J1D202A (AT&TCo Std) - Integrated Telephone,
Keys and Transmitter-Receiver Equip-
ment for FM Serial Voiceband Trans-
mission
List 1 - Framework, assembly, Wiring, and
equipment per SD-1D003-01,
Fig. 1, 2, 3, & 4
J1D202B (AT&TCo Std) - Separate Transmitter-
‘Receiver Equipment for FM Serial
Voiceband Transmission
List 1 - Framework assembly, wiring, equip-
ment, and rear cover (front cover
not included) per SD-1D019-01,
Fig. 1, 2, 3, & 4.
List 2 - Front Cover
j J1D202, ISSURh, 5 :
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@ Fig. 1 - Data Set 202A
ae
bese 2005/05/20 : CURD gg 804 9H 98700070002-3
E Jip202, ISSUE 1°.
List - Front cover equipped with test
button assembly. Test switch
assembly per ED-1D065-( ) connect-
ed as shown on SD-1D019-01, Fig. &
5. GENERAL NOTES
5.01 Telephone set 569NB is required in
addition to lists 1 and 2 for e-wire
switched network applications. See Fig. 5,
SD-1D019-01.
5.02 If telephone lines picked up by the
Spare «keys are associated with either
1A or 1Al key systems for pickup and hold-
ing, a 229B KTU auxiliary relay uiit must
be added to the KTU equipment. See Fig. 6,
8D-1D019-01.
5.03 Telephone set 565HB 1s required in
addition to lists 1 and 2 for 4-wire
Bell Telephone Laboratories, Incorporated
Dept 5315
sf
switched network applications. It is alse
necessary to provide a 243 KTU 4-wire
Bier ential line circuit and three 2293p KTy
auxtitary relays. Th: spare pickup buttons
may be 2-wire or 4-wire or mixei, and
arranged for holding. See ee Ts
SD-3D019-01. (References; SD-69414-u7 ana
S$D~69425-012)
5.04 Lists 1 and 3 are intended for 2-
4-wire private line applications
where no telephone is required. 4 test
button mounted on the front housing of the
data set provides the self-testing veature.
See S$D-1D019-01, Fig. &.
Ge
5.05 Line and test switen per $D-1D020-0:
shall be installed on 4-wire private
line applications to pernit back-to-back
testing vy the customer and to provide un-
interrupted termination to multipoint
pritate lines when the data set is dis-
connected for maintenance or testing.
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DESIGN PARAMETERS OF CN-LIMG “MEASUR NG EQUIPMENT OUTEUT
1. PURPOSE. The purpose of this paper is to outline the design
parameters for developing a direct commmicaticn link between coordinate
reisuring equipment and a central computer on a real-time basis.
2. SCOPE. Transmission between the computer and the remote st:tion
is to be via two twisted pair of standard 18 or 20 gauge telephone q. ality
lines. Adequate steps have been taken to insure minimum interference from
outside sources. One pair of transmission lines, commencing at the
central. computer site, is to be connected to a page printer. The co: tractor,
nowever, is to hav2 no responsibility for the printer except for con: ideration
of placement within the operator's imnediate control.
The second pair of lines to the computer is to be connected to
the mensuxing equipment digitizing system through a pair of Westera Flectric
Conpaay Data Phone subsets, model 2028 lists 1, 3, A, and B. One Daia.
Phone will be located at the computer room, and the contractor is to have
no responsibility for this unit. The second Deis Phone is to be mow.ted
la the digitizing 3ystem, and the contractor is responsible for providing
the oscessary interface connection. In all cases, the customer will be
respoatibie for providing the Data Phones and Printers. For the pur.ose
of to.c paper, the measuring equipment and digitizers are understood to
covtist of a measuring engine, sulse generators, pulse decoding system,
digital accumulators, burfer storage as required, end circuitxy for generating
epee’ a. cheracters as later explained. There is to be no data connection
between the printer and digitizer except through the computer Jink.
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3. TRANSMISSION INTERFACE. The Data Phone interface is to meet the
following requirements:
a. Electronic Industry Associates (EIA) specifications to which
the Data Phone was built. It is currently EIA-RS 232, but should be
checked prior to final design for any changes. |
b. Data Phone to operate in the half duplex mode.
ce. Transmission is asynchronous with the rate of transmission
to be fixed at 1200 bits per secon? + 1% tolerance, and is binary
serial.
d. A voltage within -8 to -20 represents off or marking (1), a
voltage within +8 to +20 represents on or spacing (0).
e. In addition to the information bits to be transmitted, two
pulsing bits must be transmitted for each character. A start pulse is
a space or (0) and is the same duration of the other bits. A stop
pulse is a mark or (1) and is a minimm of 1.5 bits in length but
may be longer.
4, CODE REQUIREMENTS. The code to be transmitted will meet the
foilowing requirements:
a. Code to be used will be Field Data Code, consisting of a
6-bit character plus one parity bit. Parity is to be odd.
b. The 2° or least significant information bit is the first
bit tobe transmitted from each character.
c. Parity is to be the 26 bit aad ia the last information bit
of each character to be transmitted.
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eGQ
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5. MESSAGE UENERATED, The message ts be generated by the measuring
pment systen shall consist of: ( See eopendix A for output seguence.)
a. O3gital coordinate values Por each axis of the system. This
shell normally consist of six decades plus sign per axis.
b. A start of message character ‘SOM).
¢. An end of transmission character (KOT). (This bit configura-
tion would normally be a parity error’.
d. A message parity count (MPC). This is the sum of bits of all
characters transmitted (including SOM and KOT), and is non carry add.
Lateral parity is odd. Longitudinal rarity is even. The parity bit
is to be the sum of the longitudinal parity bits.
e. Four special instruction charecters » each generated by four
operator controlled push on, push off back Lit switches, two dunmy
bits (mark or 1) » end a parity bit generated by the equipment based
on the condition of the four switches. The fixed dumy bite will ceeupy
Hana 2) pit positions.
the 2
f. A special readout character geierated by five momentary
contact push button switches and two fLxed dummy bits occupying the
29 end 26 bit positions. The dummy bits are to be spaces or O's,
{t is understood that the parity (26) is to be fixed at 0 so that
if two of the five switches are pregsel at the same time, a parity
error will be detected. The five switches are to be understood as
readout switches and will also control the request to send, SOM and
text as later described.
g- Three rotary switches are to be provided for machine
identivication purposes. These switches are to have the capability
to create O to 9 and are to be placed in the equipment so that only
the maintenance engineers will have the capability to change them.
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- 3-6
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k. A mininam of 12, twelve position rotary wwitehes. These
svitehes are to have the cepability of producing O to 9, minus (-},
ard EOT.
5. SPECIAL CIRCUITS. There is to be no character by cheracter
acknc wiedge signal veceived by the digitizer cutput cirevit. However,
“here 13 to be a message acknowledge or error signal received on the basis
of the totel message transmittec. The reply will consist of SOM, A or E,
HOt, ard MFC. In addition, a timer is to be incorporated in the equipment
"Oo toteger an alarm if the reply is not received in a predetermined time to
(2 specified by the custorer. The output is to be held in the digitizer
cuffer anti] an acknowledge is received or she timer elarm is triggered.
(f ar ervor signal is received clue tc a bad transmission, the timer is tc
2 Pesce and another attempt eat transmission is to be made. After a set
cumbs r of attempts of retrensminsion (under computer control), an acknowledge
Sr error signal vill net be returmmed and the timer will time out. [If a read.
cWi ig initiated but never reaches the commuter, the timer will also tine
-ui; Werming the operator that “he transmission is not taking place. Since
@ Ta.a Yhoaes are to be operried in the sl? duplex mode, the return
“hig w-oadge or error mush psss over the same iines and will not be trans-
rint~d metil the digitiaer transmission is completed and the Line phase
ela loigauip is reversed.
in asdditicn, an indicator light is to be placed on the control
vane. 1 close proximity “o the readout switches. On depressing any one -
sue Tive readout switches the light is to sur on and remain on for
‘proxi ately one second or until an aclmowleige signal is received, which-
‘ver Le Longer. This wili indicate to the cpzretor that a readout has
heen initiated within the digitizer.
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Rent iftiese Fybeds 2 Pim en en tn enlace iii
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A numer.cal display of the coordinate sj}..cem should be olaced.
o:. the measuring engine within the operator's field of view. A reset button
fur each axis shall be placed on the contrcl. It is also desirabie but
not mandatory that a master reset button be provided and a manual set feature
fur eack decade of the counter to give the operetor the ability to set the
cc ucter value to a predetermined value cher then zero.
7. SEQUENCE OF OPERATIONS. Having properly set up the measuring
écuipnent as instructed, the opersetor will procede to take measurements
ad thus transmit data. Prior to actuating the readout mechanism he will
set up the necessary couputation instructions on the 16 push on, push off
switches comprising the four inetruction charecters. Then, on ali ning the
reference mark with the image he wlll depreas one of the “ive reagout
syitches comprising the readout character.
Cn actuating one of the five rendout switches, the digitizing
system will set the timer, energize the readout indicator light, and apply
tke request to send signal to the Data Fhone. On receipt of the clear to
send, the bit by bit message will be fed to the Data Phone as indicated in
Arpendix A. |
After serding she mesesge, the digitizing system will ‘ared the
acknowledge or error signal. If an acknowledge signal is received, the
buffer storage will be veleased and read; to eecept the next readout. If
an ecror signal is rece: ved, the above procedure is repeated (including
resesing the timer and readout light) seading the identical messege. After
@ 3e% nuer of tries uncer computer contol, neither an acknowledge or
errc.: sigmal will be seus to the digitizing system from the computer and the
tines will time out, energizing an audibic alarm indicating that trensmission
hel aot been successful. Also if the Date Phone lines fail to set up, the
tiner is to time out giving an alarm. Wren an alarm occurs, the operator
ig to reset the alarm circuits by controls to be provided and attempt retrans-
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APPENDIX A
Typical Readout Sequence
Qutput Sequence
1. SOM 1
2. Readout Character ie)
3. Instruction Character [| P
4. Instruction Character | P
P
P
BE
1
5. Instruction Character
« Instruction Character
MOrFEHOO In
Or pM mM a MO fry
OOM RE bb
© © pd bd Pd Ps Od
© O Pd bd Os Pd ad
be bt DS Pd Pd Pd Pd
0 to 9
ee Oo 1.0”
1iooo oO}
a Ste ee
14, Sign plus
minus _
values 1
values
values
Values 1
values
0 to 9
is, ¥ 9
20, ¥ values 10°) a eee
21. (Machine identifiers)
22. (Machine identifiers)
23. (Machine identifiers) |
3h; 12 Position Rotaries
25. 12.Position Roteries
26. 12 Position Rotaries
27. 12 Position Roteries
28, 12 Position Rotaries
29. 12 Position Rotaries
30. 2 Position Rotaries
31. 12 Position Rotartes
32. 12 Posision Rotaries
33. 12 Pociiion Rotaries
34. 12 Position Rotaries
2b: 12 Position Rotaries |
30. MPC | SEE TEXT
as
0 to 9
A A NTC Ret ARS RA) erm Be
0-9, -, HOT
Sa te ae ens i cceaiiaiceameaemin o
eae i
X = bits controlled by operator
switches
P = Parity bit generated by equipment
@s required on the basis of the cor:
dition of the X positions.
25 af 53 92 ol 20
O=l 2210000
l1=O 110001
2=0 1100210
3=h 1 loolil
he=O 110100
5*f! 1 1loO12 O01
Se LE 40-2. 40
8=0 111000
Bo Oe Os 43,
- ze 10060060424
EOT =“ O0O10%101
Error el 0 0101 0
Acknowledge = oOo 11210
EOT must be placed on one of the 12
position rotary switches and will be
immediately followed by the MPC.
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