FEl>-jl’1>-1020A
Idtwary
1, 1980
SUPERS
E1)ING
FED STD 1020
September 24, 1975
FEDERAL
STAN
I>AR1>
l’1:l.l~(
:OMMIJNlc/11
IONS:
ELE(:TRI(;
AL
CHAR
ACTERISI’lc;
S
(.)F
OALANCI;
I>
VOL1’AGE
IIIGITAL
INTERFACE CIRCUITS
l’h]s
$tandard
is
iss(]ed
by the General Services Administration
pur-sllant to the Federal Property
and
Adrninistrative Services
Act
of 1949, as amended. Its application to both data processing
systelns and telecommunication systems is Inundatory on all
Fed-
Cr~l
agencies
to
the
extent
specifies herein.
1.
SCUPE.
Tl]is st[indard spe(
]
f
ies
thp
electrical characteristics
of
balanced voltage
digital
lntc’r face
clrcults
i~orrylally
irTlplemcrlteci
In
integrated circuit
technology that
art’ to be employed for the
Interchange
of serial bindry
(Iatd, tlrning,
:ind
{-ontrol signals between voice
or data telecommunication equipment where information
IS
being
(onveyed
at the I)(
b.iwb.lnd
level at d~ta ~ignaling
rates
up
to
10
megabits/s.
The functional and
Inechanical
((.ollrwctur) ch~r’t( tt~rlst]t
s
of the
interf~f.c
between data terminal equipment and data circuit-termirlating equipment
ernpluying
Inter
fdce
circuits
compli~nt
WI
ttl
this standard are described in other Federal Standards (e. g., Federal
$t~n(i.ird
1031).
Jn
tllosc dpp!icati(~[l~
wt~ere
a connector
IS
not required for interfacing equipment
employini
interface
\
rlr{
Illts
cori~plidnt
~lth
this standard, the functional
~nd
mechanical
characteristics
o~
the
Interface
s!I-11
be
:<,
.Icfill(.d
in
the applicable
prof-llrement
speclflc~tion.
1.2
N@lcdtl[)rl.
T7~Is
st~ndarcJ
shall be
Uw>d
Ily all Federal rfepartrnents and agencies in the design and procure lnent
—.
~)f
t(~~ecornrrlunlc.~tlt)n equipment employing baltinced voltage digital interface circuits. It is to be used with other
tppl]f atlc)n ~WfPrd] Standards or design
spe{’lfications
describing functional,
mechanical, and procedural
ch.+rac-
.~
teri~tlcs
a~
l~ecessary to dchieve
colnpdtjble
Interfaces.
2. APPLICABLE
JXKIJMEINT>.
The
followirlg document forms part of this standard to the
extent
specified herein:
-.
Electronic Industries Association
(EIA)
StarldarcJ
RS-422-A, Electrical Characteristics of Balanced
Voltage Digital Interface
Clrcu~ts, dated December 1978.
(Write
to
Electronic lr~d[lstries Association, 2001 Eye
$treet,
N. W., Washington, DC 20006 for copies of RS-
422 A.)
3.
REQLJIKE,MENT.
‘r!~e
electrical
ch~racterlstics
of balanced
voltage
digital interface circuits shall conform to EIA
$t~~iard
R’5-422A.
However,
Federal
departments and agencies who have and will continue to have in their inventory
s~lbs[,~ntlal
qtlantitics
of equip lrlent using interface circuits compliant with
MIL-STfT-188C
or MI
L-STD-188-100
sha!l
use
KIIL-STI>-188-114
ir]
lieu of tl}is stal~[lard.
(Interface circuits described in
MI L-STD-188-114 are a compatible subset
of
tl~(we
prew
r]
bed
In
this stdndard.)
4.
CHANGES.
~/l)t.r)
;l
f.’c(for;il ;lgell(-y (-oosiders
th~t
this st~ndard does not provide for its essential needs, a
.-_—.
—
ttiit(~lr~er]t
c
Itlll}<
irt
shill
be sent
irl
duplic’,ite to the Genera] Services
Adlninistration,
Federal Supply
%rvl(
e, V,
IILJe
l:ll~l[werlr)g
l~lvislon (FR EV), Washington, DC 20406, in accordance with provisions of Federal
I)t
(y)~’rty
M.in.*gfmll)(’nt
Rcgul~tlol~s 41
(lFR
}S 101-29.3.
The General Services
Admlnistratlon
will determine the
,Ippr[)i)rl<+te
dctl(~r)
rt~
be t~kei~
~nrf
WIII noti
fy
the .igem-y.
5.
(.:
ON
FLI(;
T
W]l”bf
RU:ERENCED
L)cKJMENTS.
Where the requirements stated in this standard conflict with any
._.
———..
rrquirerr)er~ts in a referenced document,
the requirements of this standard shall apply. The rmture of the conflict
I>t)tw(’err
this standdrd
dnd
d
r-e fererrced doculner]t
shall be submitted in duplicate
to the General Services
,Adrrllr)istr,it]
or),
Federal Supply Service, Value Engineering
~ivlsion
(FREV),
Washington, DC 20406.
L
FSC TELE
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