ICC Modem 2200 - Fabio Montoro

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Q MODEM
2200/24
Ecor:lomical 2400 bps on dial-up or dedicated lines.
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Standard Features
Dial-up Nelworks - Designed for long distance dial-up
(DDD) service at 2400 bps.
Dlal-up Back up - The same modem can operate over
dedicated circuits ar be switched to dial-up if dedicated
service degrades ar fails.
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Modem 2200/24 is a state-of-the-art, four-phase data set
designed to operate on either dedicated or dial-up phone
lines. Although it is priced competitively with other commonly used 2400 bps data modems, it is not just another
licensed copy, but incorporates proven ICC design techniques. It delivers the highest leveis of reliability available.
Dial-up Capacily Exlends Syslem Capabillly
Wilh ils abilily lo operale over dial-up telephone lines,
Modem 2200 / 24 provides new opportunities lo increase
syslem flexibilily, reliability and Ihroughput, while reduc'ing operaling cosls. For lhe firsl time, dependable 2400
bps dala can be transmilted over random dialed lelephone lines wilhin several seconds after the dialed number has been answered and switched to dala service.
Regular EDP operaling personnel handle lhe complele
connection.
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Syslems wilh Dedicaled Lines Benefit
Irom Dial-up Capabilily
Modem 2200/24 also provides increased Ihroughpul and
reliability lo dala communicalion systems operaling on
dedicaled, leased circuils. When lhe leased line, degrades
or breaks down, Modem 2200/24 provides a readily available backup never before available. Previously, in order
to have dial-up backup ai ali, users were required to
operate at lower speed during the emergency period,
while paying full price for the second slandby data se!.
With Modem 2200 / 24, a single data set provides 2400 bps
at ali times on either the leased circuits or over dial-up lines.
Typical Applications lor Modem 2200/24 include:
1) Dial-up 2400 bps service
2) Dedicated 2400 bps servjce
3) Dedicated, with back-up at a full 2400 bps over
dial-up lines.
4) Point-to-point, full ar half-duplex service.
5) Multi-station polled networks
6) Multi-line polled systems
7) Where errar rate must be improved
8) Expansion of existing 2400 bps networks which
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use other manufacturers' tour-phase modems
9) Worldwide communications circuits
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Compalible - With existing computer interfaces (ElA
Standard RS 232B ar C).
Compalible - End-to-end compatible with Weslern ElecIric 201 B.
Compatible - With either of lhe two CCITT recommendalions
Compatible - For use wilh Dala Access Arrangemenls
(manual and for aulomalic lerminals). The Telco supplied
Data Access Arrangement for Aulomalic Terminais can be
adapled for use wilh non-aulomalic Dala Terminal Equipmenl Ihrough lhe use of a special ICC adapter.
Reliable Performance - Insured by experienced ccnservalive design coupled wilh 100% burn-in including maximum lemperalure cycling and vibralion Ireatmen!. ·
No Rouline Mainlenance - On-Cal/ service available
nationwide.
Quick Syslem Trouble Isolation - Built-in telephone line
and digilal buss-back swilches quickly isolale problems to
line, modem ar data processing equipmen!.
Compacl - Occupies only 3V, inches of rack space. '
No Adjuslmenls - Slrap selection during inslal/ation 'defines desired line leveis and operalional mOde. No further
adjuslmenl required.
Low-error Rale - Due to ICC's exclusive modulaliondemodulalion technique.
Fasl Synchronization - AI ali times.
Band Conlrolled Oulpul - Specially shaped line signal
ulilizing best portion of average telephone line, yet compatible with other 2400 bps data set designs.
Noise Rejeclion - Filters minimize effecls of noise, rejecting ali noise not in the spectrum of interest,
Wlde Range AGC - Automatic Gain Contrai has ±10 db
dynamic range.
fnslrumenl Grade Power Transformer - Provides high degree of isolation trom naise on power line.
Fast "'Clear to Send" Response - Cuts "turn-around "
time .
Dibit Clock - Outpul provided for certa in terminal
equipmen!.
Solid Stale Throughoul - Inlegrated circuits and silicon
devices insure highest attainable reliability in extreme
environments.
Allraclive Packaging - Suitable for use in exposed
location5.
No V_ri_ble Componenls - No "tweaking" of contrais required at lime of installation.
1200 bps - Available by strap seleclion lo those who are
moving up in bil rate ar who want a single type modem to
serve both needs.
Highly Flexible - A standard modem for variety of
applications.
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Design Techniques Irom Modem 4400
Provide Unique Advanlages
In order lo build-in lhe unusual performance characlerislics 01 Modem 2200/24, ICC relied heavily on lhe lechniques developed 101' Modem 4400, lhe ICC dala sei which
delivers up lO 4800 bps over uncondilioned dedicaled circuils. One lealure borrowed ,rom Modem 4400, lhe abilily
lo sei slraps ai inslallalion which a'lIows a single unil lo
serve a wide variely 01 syslem applicalions, is an improvemenl on lhe original lechnique. One slrap oplion
even perm ils lhe seleclion 01 1200 bps ralheI' Ihan 2400
bps 10 1' users who have bolh speeds in Iheir syslem , OI'
are in lhe process 01 converting lrom 1200 bps lO 2400 bps.
Despile lhe unusual advanlages 01 Modem 2200/24, il is
end-Io-end compalible wilh olheI' lour-phase dala seis
such as WE201 B. The useI' whose syslem is operaling wilh
Ihis Iype 01 dala sei can add lhe benelils 01 Modem
2200 / 24 wilhoul disrupling his presenl syslem.
Economical Operation
Modem 2200/24 ofters conlinuing economy when operaling as an indivi dual unil OI' as pari 01 a lolal communicalion syslem. On dedicaled line syslems, Modem 2200/24
el iminales nol only lhe cosi 01 a separale slandby modem
101' backup, bul also lhe cosi 01 line condilioning requ ired
by olheI' 2400 bps dala seis. In any syslem, il ofters lhe
advanlage 01 an economical price combined wilh lhe opporlunily lo eilher purchase OI' lease. It ofters conlinuing savings in compuler and lerm inal lime resulting
Irom subslanlial increases in Ihroughpu!.
Developmenl 01 Modem 2200
Modem 2200 is a nalural lollow-on lo lhe widely used
ICC Modem 4400. Allhough Modem 2200 does nol ofter
ali 01 lhe bene,ils 01 Modem 4400, il borrows heavily Irom
lhe Modem 4400 design , performing betler Ihan previously
developed lour-phase 2400 bps dala seis. Il has lhe
unique abilily lo "Ialk" lo bolh lour-phase modu lalio n
schemes specilically noled in lhe CCITT recommendalion
101' 2400 bps.
For lhe useI' who is nol able lo benefit· Irom lhe narrow
band lealures 01 lhe Modem 4400/24 PB, Modem 2200/24
ofters lhe highesl reliabilily and besl error perlormance
available loday.
Description
Modem 2200 is a synchronous dala sei which operales
ai a lixed serial dala rale 01 2400 bils-per-second (OI' 1200
bps when desired) ulilizing difterenlial lour-phase modulalion and coherenl deleclion. The modem operales over
mosl lelephone lacililies including dial-up as well as ' 8
3002 (uncond ilioned, C1, C2 OI' C4). The device inc
bolh a modulalor and a demodulalor along wilh lhe ~lr­
cuilry necessary lo operale under conlrol 01 inlerface
signals.
The only oplional lealure Ihal requires separale ordering
is lhe Aulo Answer Fealure 40B. Because 01 lhe evolulionary nalure 01 lelephone company ofterings, inlormalion
regarding lhe use 01 lhe modem wilh Aulomalic Iype
Dala Access Arrangemenls is provided in a separale
dala shee!. Ali olher oplions relaled lo lhe operalion 01
Modem 2200/24, including lhe abilily lo operale wilh
manual Dala Access Arrangemenls, are built-in as easily
seleclable slandard lealures.
Regeneralive repealer capabililies have been incorporaled. Regeneralion has been difticull or impossible wilh
olheI' widely used lour-phase 2400 bps dala seis.
The modem conlains ils own regulaled power supply.
Thoroughly lield proven designs, conlrolled produclion
procedu'es and sophislicaled manulaclurinQ lechniques
are combined lo insure a reliable produc!. Rigorous preshipmenl 100% burn-in and lesling procedures assure immediale dependable operalion ai lhe inslallalion sile.
Simplilied packaging lechn iques and lesl ,ealures are
employed in conjunclion wilh complele eliminal ion 01
variable co mponenls (such as polenliomelers and vari able
capacilors) lO permil inslallalion and operalional mode
changes wilhoul need ,or oulside specialisls. Ali modem
circuitry is constructed on printed wiring circuil ~s.
Silicon devices and inlegraled circuils insure op(
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01 lhe equipmenl over lhe limils 01 O lo +55 degree5 ~en­
ligrade ambienl lemperalure, and relalive humid ily up lo
95 percen!. Transislors are melai cased and hermelically
sealed. Highesl inslrumenlalion quality slandards make il
ideal lor use in bolh commercial and mil ilary dala
communication.
Alternale vOice/ dala service over leased lelephone lines
may be achieved by lhe use 01 a Model 12 Voice Adapler.
The voice adapler does nol inlerlace wilh lhe lelephone
line, bul connecls direclly wilh lhe modem Ihrough a conneetor on the rear.
Operational Characteristics
DATA RATE
Slandard .. ......... 2400 bils per second - synchronous
Slrap Oplion .. . ..... 1200 bils per second - synchronous
OPERATING MODES
Full Duplex, simplex or half duplex.
MODULATION
In lhe mOdulalor, se rial dala is encoded Iwo bils ai a lime
lo produce a lour-phase line signal , (Iwo-phase lor 1200
bps). Fil l ering Occurs prior lo enlering lhe lelephone line.
In lhe demodulalor, lhe received sig nal is lillered and lhe
phase shifted signal is delecled and decoded. The decoded digilal dala is serially shilled oul 01 lhe demodulalor by lhe dala derived inlernal clock.
PRIMARY POWER
AC inpul eilher 105-125 or 210-250 Vac, 45-65 Hz, single
pha. e, approx. 30 watts. Powe r conneclor cable wilh 3
pin U.S. Iype plug lor primary power conneclion supplied
wilh modem .
L1NE REQUIREMENTS
Modem 2200 will operale over dial-up (00 0 ) circuils.
Modem 2200 will also operale over Type 3002 (uncondilioned) voice channels, larift FCC260 (previously called
Schedule 4). More highly condilioned lines, such as
Grades C1 , C2 and C4 (schedule 4A , 4B and 4C) may
also be used, bul are nol required.
EQUALIZE R
A lixed, slalislical eq ual izer is provided in lhe sl andard
uni!. This lixed equalizer complemenls amp lilude and
envelope dislorlions 01 lhe average uncond ilioned vo ice
Irequency channel. Due lo lhe exlreme lolerance 01 lhe
modem to line va riations, it will out-perform other modems
wilh lhe slalislical equalizer in lhe circuil even
lal
or C4 lines. The provi sion is made, however, 1
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bypassing 01 lhe slalislical equalizer under spec i al
circumstances.
OPERATING ENVIRONM ENT
Ambienl Temperalure O' lo + 55 ' C
Relalive Hum idily (max) 95%
Altilude (max) .. . ........... 10,000 ,eel
Accessorles
Model 12 Voice Adapter - provides for alternate voice/
data on leased circuits and ave r dial-up lines after connectlon hae been made w ith the Data Access Arrangements.
,",ate: Not for use with Automatic type Data Access Arrangement units.
Model 21B Line Adapter - provides quick and convenient
"""......'·~'; ~ etho of switching from dedicated service to dial-up
'liervlce. Can be used in either full-duplex ar half-duplex
operation. Use of this item enables a s ingle data set to be
used over either dedicated leased lines ar dial-up circuitry.
Note: Not for use with Automatic type Data Access Arrangement units.
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CONTROLS
Technical Summary
TRANSMITIER
Power on-off Switch .. Delivers AC to power supply.
DATA INPUT
Format ........... . .. Serial Binary Data
Power on Light .. . .... Indicates power is on
Amplitude ..... , ..... EIA/CC ITI, :!:3V to :!:25V, ( + ) =
Data Carrier Detector
" O", ar space; (-) = "1" ar mark
Alarm Light ........ llIuminates when carrier is below
Input Lines .......... Single wire, ground return
prescribed levei.
Input Load . . .. . .. .... 5600 ohms, nominal
Telephone Line BussOUTPUT TO UNE
back Switch ....... Connects Modem transmit output
to recei ve input, thru a 16 db pad,
Output Signal ........ Differentially phase shifted 1800
and loops telephone li ne together
Hz carrier, 4 phase (2 phase for
at modem terminais.
1200)
Digital Buss-back ar
Output Levei ... . .... Adjustable, +6 dbm to -14 dbm in
Regenerator Switch . Connects digital signals from re2 db steps (O dbm to -20 dbm for
ceiver to transmitter. Data terminal
2 wi re) .
eq uipment signals are bussed
Output Impedance .... 600 ohms, balanced
together.
CLOCK
115 volt/230 volt
Waveform ... . . ...... Squarewave, negative-going edges
primary power
coincide wi th the center of the
source selector .... Selected at installation.
data bits. Positive-going edges
coincide with change of input data.
STRAP OPTIONS
Freq uency ... • . ..... For Externa i Use, 2400 Hz :!: .01 %,
Send 'Level Output .. , .+6dbm lo -14dbm in 2 db steps
50% :!: 1 % duty cycle. From Ex(Odbm lo -20dbm for 2 w ire).
ternai Source, 2400 Hz :!: .01 %,
Receive Levei Inpul ... Nominal input levei seleclable from
50% :!: 5% duty cycle.
-16 to -52dbm in 6 db sleps. DyAmplitude
namic range of AGC enable modem
For externai use .... :!: 6 vo lts from approximately 330
to operale with signal input ranging
ohm source
:!:10 db from selected levei.
From externai
Send Carrier Conlrol .. Puts send carrier under Request
source .......... EIA/CCITIStandard, :!:3Vto :!:25V,
To Send control, w hen used ar
inlo 5600 ohms, nominal
permits permanent carrier
Rec eive Carrier
RECEIVER
Contrai . . .. . . .. . . . Receive Carrier is conlrolled by
DATA
OUTPUT
RTS in 2 wi re operalion.
Format .............. Serial Binary Data
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Modulation Contrai ... Selects either CCITT recommenAmpl itude ........... = 6 V EIA / CCITT Standard +6V
dalion for 2400 bps.
" O". ar space; -6V
" 1", Dr mark
Trans mil Clock ....... Internai ar Extern ai.
Output line ....... . .. Single wire ground return
Requesl lo Send ..... Used ar nol used.
Output Impedance . . . . Approx. 330 oh ms
Clear lO Send Delays .. Oms-for special use
8.5ms-normal use
INPUT FROM UNE
25ms-regenerative rep eate r use
Input Impedance .... . 600 ohms, balanced
150ms-half-duplex use
Input Levei ........ . . Nominal input levei selectable from
Mark Ho ld Data Clamp . Holds dala aI mark under Data
-16 lo -52 dbm in 6 db steps. DyCarrier Detector co ntrai whe n
namic range of AGC enabl es
used.
modem to operate with signal inp ut
Receive
ranging :!:10 db from selected levei.
Clock Clamp . . . .. .. Holds clock aI positive ar negative,
Levei Detection ...... Normal operatio n of OCO is 10 db
as selected, under Data Carrier Debelow nominal input signai. Straps
tector conlrol , when used.
permit selection of -30 dbm for
New Sync Fealure . ... Causes fasl (8.5ms) synchroni zaCCITI
applications.
tion as resuft of " New Sync" f rom
CLOCK
Dala Terminal Equipment.
Waveform .... .. .. ... Squarewave, negative-going edges
_ _~ • Automatic Sync
coincide ' with the center Df data
Festu re ........... For normal use , causes fast
bits. Positive-going edges coincide
(8.5ms) synchronization .
with change of output data. De2400/1 200 bps Selecl . Permits selection of bit rate.
rived trom received 5;gna1.
Frequency . . . . . . . . . Equal to the data bit rate and
SlZE ANO WEIGHT
IN CABINET
IN RACK
synchronized wi th the transmltter
Helght .............. 3-9/16 inches
3V2 inches
clock.
Width ..........
16'/4 inches
19 inches
15'/. inches
Depth ....... ... .... 15'/s inches
Amplitude
For externai use .. .. ± 6 vo lts trom approx. 330 oh m
Weight, net . . . . . . . . .. 16 pounds
19 pounds
source.
Weight, shipped ..... 25 pounds
28 pounds
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Input / Output Connections
AEOUEST
TO SENO
ClEAA
TO SENO
TRANSMITTER CONTROl SIGNALS (Not.1)
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ConneclOt
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1 tNOTE
2)
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3
2ms
-----tvvvvY~
5
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BEOIN
SIONAl
UNE
OATA CARRIER +IV
OETECTOR
-tN
RECEIVEO
OATA
::.~
SIOW.l
INTERRUPTION
SlOW.l
INTEI1.RUPTION
lES' THAN la ms
,..,...,
I
GREAT1::R
lO
TliAN
~
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,"0".-i~'-1 ~
~ rulf
...
1I ~
L.f1..nJUtf * L......v--J
7~
*.
*
MAAK
MAR"
HOLD
HOLD
rI
RECEIVED
UNE S,GNAL
<
"m.
(NOTE · 1
ENO TRANSMIT
,
FAOM "A"
~~ I'O""
1
SA
Transmltted Data
'"
9S
Recelved Dala
'"
CA
Aequnl la Seod
Thl. Ilad conta i"s lhe ~
~
orlgl nall in lh e te rmtnal _ ItC!.·~'o~
and are lo be lre n. mltled III _.
.
moc.m lo a d lst l nl Ilallol'l
lo the modem.
TII II Ind cool8fnllhe slgnall Ihal are
gene raled by lha dala modem ' n (W•
,oon,a lo IIonal1 Irom a dlllanl I t l - l
1I0n. An oulpul Irom lhe mod.m .
A" "00" condllloo on Ih I1 leld Indlcaiu Ihll lhe dalI lermlnll eaulomenl
I1 rndy lO Ir.osmll dll • . An Inp ul 10
lhe modem.
'"
CS
Cln r lO Send
'"
CC
Oala Sei Ready
'"
,,,.
AS
Slgoe! Ground
NEW SYNC
+llc>+~.
- --- ------n
~Ic>-m.
""
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8
CF
I !.'m.
~
HOLD
Ir---
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Ir'Olmll dala Irom lhe d.l. term ln,'
I
e au lpmenl la a dl8l.nl lerm ln. 1. An
I
OUIPul Irom lhe modem.
A" "on" condllioo on Ihls leld Ind i.
catn thal lhe powet to lho d. la _
modem Is 00. Ihal lhe maCem II nOI In
lhO "Inlarlaco Bunback" 10.11 modo.
a nd Iha l lhe mOdem Is reedy lo proces. dala. An oulpullrom lhe modem. Thls le.d eslablllhas lhe common
ground flIflrence oollnllal lor lU c!tcultl excepl prollCUve ground.
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Aecelved llne Slg na! Thll Ilad providas .n Ind lcallo n Iha l
(Oala Carrler) Deliciar dala carrier slgnala Irom Ihl remO!1
slallon ara beln; race lved. "n OUlpul
Ito m lhe moclm.
11
12
Nlw Sync
"
'"
OS
Tta nsmlttld
SI;n.l Etemeol
Tlml"g
Tranlmit
Olbll Clock
TMI lead ls provlct.d 10t UH .1 , .... N Cl lvln; 5181100, fo, mu lll·p.r1y ooe,.1I0n. Ia lhe CU. lomer mav elfe ct a
more r.pld Ira nlltlon In .ynchroniuIlon belween In....g••. An InPUI 10
lhe modem.
S I;nals on Ihis Ci tCr,t11
uaed 10 provide lhe data term in.1 eoul pme nf WlIh
sl;na! eiemlnl IImlng Inrorm aUon '-oulpul Itom lhe macem. Nol
wlth OA.
.re
!~~als~:: .:a~:IJi;b~·'lh:n c~
"'./ l
/"'
lar lynch ro nl1atlon ai lhe d!bl,,11 10 deslred.
modem.
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~~I~:O~~~tCt~~d~~~~ ~~d~~II~e~eda~~dt'~
13
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O.'ctipllo n
Dala Mocem Tesllng +6 VOItI
Oala Modem Tesllng -6 Volts
9
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MARK
.,NVAlID
M
103
/6
BEGIN TAANSMIT
• v v
FROM "B"
n
RECElVEO
DATA
,
.
RECETVER CONTROl SIGNALS (WIIh N_ Sync:)
DATA CARRIER
OETECTOR
'0'
Th l. lead II an Ill cl tical
trame and a-c powe t gtOU
I
-- ll ---I~
!.~~ \ ~
-T~~
*INVALIO
(FROM TERMINAL
EOU IP~ENT AT
RECéIVlNG SITE)
La .d
Protecllve Grouod
Oul;·
nlllon
RECEIVER CONTROl SIGNALS (Normlll)
RECEPnON
SIGNAl
RS232
Oul;nlllon
,
I
l iNE
SIGNAl
CC ITTV-2 ~
An oulput lrom
."
00
Recelver Slgoal
Elemenl Tlming
103/2
CO
Oala Terminei
Audy
See Nole
Alng rndlCllor
See Nole
Ina
J'
Slgnall on thls citcull ara used to
provlde lha d.la latminar equlpm.nl
wllh li;nal alemen l IIm! n; Inlorml'
lIo n. An oulpul Itom lhe mod.m.
"
19
20
22
23
"
'"
C,
"
'"
OA
25
TransmUter Slgnal
Elemenl Tlmlng
OUI 01 Setvlce
••
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Slllnllls on Ihls clrcull are used la pro_
vide lhe transmitllng modem '11'111'1 11gnal elemenl Ilmlng InrormaUon. An
Inpul la lhe modem . NOI used wllh Da.
Se. NOIII
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Conneclor described above males wilh custo mor provided ClnCh Of
Cannon 08-191504-432 plus a 08-51226-1 hood (Cinch only), or equlvalent. connector 10 lhe EOP BQu ipmenl. VF li ne connections are made
10 a lerminal slrip with 1 & 2 Transmil. 3 & 4 Receive. Th ree wire po wer -..1
cord lurnished with modem . Ali connections are made In rBar 01 chassis.
1
(Note 1)
A typical mode of operallon Is shown. Olher modes exlsl by use o f
strap opllons.
°Requl red by certai n OTE bul nol dellned by ElA or CC ITT.
During any perlod where elear lO Send 15 negatlve , slmu llaneous wlth
a Une signal, marks are transmitled .
Nole : Plns 20. 22 and 25 used when modem is used In Aulomatlc Answe
appl lcallons. See separate data shee!.
(Note 3)
Oecoding delay approximatery 1 ms. (typlcal.) For clarlty, oUlput filler of
transmitter and InpuI filter 01 receiver have been considered part oi line
deiay and are not shown. Such delay Is approximately 1.5 ms . In each
IlIte r.
(Note 4)
If the time belween lhe end of transmil Irom A and lhe beginnlng of
,
J
(Note 2)
Iransmit Irom 8 exceeds 10 ms .. " New Sync" in put is nOI reQu ired. The
app llcation of "New Sync", however, will nol alter norma l modem
operation.
When "New Sync" !eature is used . the eQu ipment inle rlaclng with the
mode m ai lhe receive r end mUSI provlde "New Sync" pulse to indlcate
the nexl message may be in a differenl bit phase condition. This is accomplished by indicating Ihat end 01 message Is app roaching ellher in
the data formal ar by rfgid liming considaratlons.
':New Sync" may be inpu lted as a posltive pulse having minimum duratl on of 2 ms . aI any lime alter th e data terminai eQ uipment has receive d
the las! reQu lred dala bit !rom the transm itter A, p ro"iding thal when
" New $ync" returns negativa there Is no Ilne signal presen!.
International Communications Corporation
7620 N.W. 36th Avenue
Miami . Florida 33147
Telephone: 305 + 836-4550
305 + 691-1 220
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