AT&T 202C Reference guide

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BELL SYSTEM PRACTICES
AT&TCo Standard SECTION 592-015-500
Issue 3, February 1976
DATA SET 202C- TYPE
TRANSMITTER-RECEIVER
TEST PROCEDURES
CONTENTS
PAGE
1. GENERAL
2. INSTALLATION TEST PROCEDURE
Loop-Back Test 2
3. MAINTENANCE TEST PROCEDURES
2
A. Voltage Interface Test
2
B. Contact Interface Test
4
4. SUPPLEMENTARY TEST PROCEDURES 5
A. End-to-End
Test
5
B. Ground Noise Test
8
5. REFERENCES
9
1. GENERAL
1.01 This section contains procedures to be used
when testing
data set (DS) 202C-type on an
initial installation or during a maintenance visit.
1.02 This section is reissued to provide the
following:
(a) Information on the use of an Automatic
Data Test System (ADTS) with data set
202C-type.
(b) Procedures for using the 6H impulse counter
instead
of the 6A for the ground noise test.
Since
this reissue is a general revision, arrows
normally used to indicate changes have been omitted.
1.03 Before proceeding with any tests of the
data set, verify that:
(a)
For switched network applications, the data
loop meets requirements specified in Section
314-205-501.
(b) For private line applications, the data loop
meets requirements specified in Section
314-410-500.
(c) Telephone portion of the installation meets
standard de talk, signaling, and supervision
requirements.
(d) Data set strapping options agree with service
order.
Take necessary stepsto ensure customer
is not billed for test calls. Refer to
the section entitled Crediting Charges
on Test Calls (01()..25()..001). :
1.04 Tests contained in this section are divided
into three parts.
Part 2 describes the test
required to verify an installation. Part 3 describes
the tests to be performed during a maintenance
visit.
Part 4 describes additional tests that ordinarily
are not required during installation and maintenance
visits.
2. INSTALLATION TEST PROCEDURE
2.01 The loop-back test in this part should be
performed immediately after the data set
has been installed to ensure that the installation
is
ready to be placed in service. If the data set
fails to meet test requirements, replace the data
set. The telephone company (telco) employee should
also
assure that data can be transmitted and/or
received using the customer provided equipment
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed
in U.S.A. Page 1

SECTION
592-015-500
(CPE)
and
data
sets
at
both
the
near-end
and
far-end
data
stations.
2.02
Although the loop-back
test
is primarily for
use
at
time
of
installation, its
use
during
maintenance
visits
should
be
considered
if
the
nature
of
the
trouble indicates
that
this type
of
test
would be useful.
•
1\
Data
set
202C-type
can
be
statically
tested
by
ADTS.
For
information
on
communicating
with
the
automatic
data
test
center,
refer
to
the
section
entitled
JJP005
Automatic
Data
Test
System
(ADTS)-Operation
From
Field
Locations
(590-010-500).
Loop-Back Test
2.03
Perform the
test
as follows:
(1)
Lift
handset
of
associated
telephone
set,
depress TALK button, and call nearest
data
test
center
(DTC).
(2)
·When
instructed
by
DTC,
depress
TEST
button
and
hold
it
depressed
until
TEST
lamp lights.
(3)
Replace handset on-hook.
(4)
DTC
originates
test
call
to data set. (Disregard
momentary ringing
of
bell.)
(5)
Data
set
is now under control
of
DTC.
(6)
At
end
of
test,
DTC
releases data
set
from
test
mode (as indicated by TEST lamp going
off).
3. MAINTENANCE
TEST
PROCEDURES
3.01
The
tests
in this
part
are
to be used as a
troubleshooting aid during maintenance visits.
The interface tests,
in
combination with the loop-back
test
in
Part
2,
should enable
the
telco employee
to
isolate
the
trouble
to
either
the
CPE
or
the
data set.
A.
Voltage
Interface
T~st
3.02 The voltage interface
test
checks the control
signals supplied to
the
customer. The only
Page
2
test
equipment required is a 914-type
data
test
set
(DTS).
3~03
Perform the
test
as follows:
(1)
Connect
and
condition
test
equipment
as
shown in Fig.
1.
(2)
Apply power to
data
set
and
then
to
test
equipment.
Power
Supply
Test
(3)
Set
DTS
FUNCTION to VOLT INT.
(4)
DTS meter should indicate 17.0 to 20.0 Vde
(positive power supply).
(5)
Set
FUNCTION to OFF.
(6)
Set POLARITY to REV.
(7)
Set
VERTICAL MONITOR to
10.
(8)
Set FUNCTION to VOLT INT.
(9)
DTS
meter should indicate 17.5 to 20.5 Vdc
(negative power supply).
(10)
Set
FUNCTION to OFF.
Auto
Answer
Test
Note:
If
auto answer option Q is
not
installed
in data set, omit this test.
(11)
Set
VERTICAL MONITOR to
6.
(12)
Set FUNCTION to VOLT fNT.
(13)
DTS
meter should indicate 17.0 to 20.0 Vdc
(CC
off}.
DS2 should be off.
(14)
Set
VERTICAL MONITOR to
22.
(15)
DTS
meter should indicate 14.5 to 18.5 Vdc
(CE
off'}.
(16)
Set FUNCTION to OFF.
(17)
Set POLARITY to NOR.
(18)
Request DTC to place call to
data
set.
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GRD
SD
F!D
I
I
DS
052
52
053
I TP
TP2
53
054
DS5
54
SCT
S5
SCF!
DS6
56
057
058
17
TP3
58
914-TYP£ DTS
(NOTES I AND 2)
CONNECTOR A
I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 25 5TG
eeoc
0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0
0.
o· o o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
00 0 0 0 0 0 0 0 0 0
0 0 0 ·O 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0000 0 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0
0000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
000 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0. 0 0 0 0
I 2 ll 4 5 6 7 8 9 10 II 12 ·13 14 15 16 17 18 19 20 21 22 23 24 25 STG
ISS 3, SECTION 592-015-500
DATA SET 202C-TYPE
GRD
so
RO
51
051
052
52
053
TPI
TP2
53
054
055
54
SCT
$5
5CR
056
56
057
058
57
TP3
58
INTERfACE
CONNECTOR
NOTES:
1. SET SWITCHES ON 914-TYPE DTS AS fOLLOWS:
SWITCH SETTING
INTERFACE
SELECTOR A ALL DEPRESSED
INTERFACE MODE VOLTAGE
VERTICAL MONITOR
9
FUNCTION OFF
RANGE DCV-30
POLARITY NOR
OUTPUT
OFF
Sl (CA)
OFF
53 !SA) OFF
54 !CO) OFF
55 (RY)
OFF
2. 914-TYPE OTS INDICATOR LAMPS CORRESPOND
TO THE FOLLOWING INTERFACE LEADS:
LAMP fUNCTION
OS2 INTERLOCK (INT)
OS3 CARRIER ON-Off (COO)
EIA
cc
Cf
Fig. 1-Voltage and Contact Interface Test Setup
(19) When ringing starts, set FUNCTION to
VOLT INT. DTS
meter should indicate
3.5 to 9.5 Vdc during ringing period.
During
silent period, meter should indicate off scale to
the left.
(20) During silent period of ringing cycle, set
S4 to ON. Ringing should stop and data
set TALK and DATA lamps should light.
(21) Set VERTICAL MONITOR to 6.
(22) DTS meter should indicate 8.2 to 10.2 Vde
(CC on). DS2 should be lighted.
Demodulator Test
(23) Request DTC to send 1190 to 1210 Hz at
-10 dBm.
(24) Set VERTICAL MONITOR to 8.
(25) DTS meter should indicate 5.0 to 11.0 Vde
(CF on).
DS3 should be lighted.
(26) Request DTC to send 2190 to 2210 Hz at
-10 dBm.
(27) Set VERTICAL MONITOR to 3.
(28) DTS meter should indicate 5.0 to 11.0 Vdc
(BB space).
Rttverse Channel Test
Note: If reverse channel option T is not
installed in data set, omit this test.
(29) Set FUNCTION to OFF.
Page 3

SECTION 592-015-500
(30)
Set
POLARITY
TO
REV.
(31)
Set
VERTICAL MONITOR to
12.
(32)
Set
FUNCTION to VOLT INT.
(33)
DTS meter should indicate 5.0 to 11.0 V
de
(SB
ofij.
(34)
Set
FUNCTION to OFF.
(35)
Request
DTC
to send 384 to 390 Hz
at
-10
dBm.
(36)
Set
POLARITY to NOR.
(37)
Set
FUNCTION to VOLT INT.
(38)
DTS meter should indicate 8.0 to 14.0 V
de
(SB
on).
(39)
Set
FUNCTION to OFF.
(40)
Set
S3
to ON.
(41)
Request
DTC to measure reverse-channel
tone frequency. Without carrier facilities,
tone
should
be 384
to
390 Hz. With
carrier
facilities, tone should be 375 to
399
Hz.
(42)
Set
S4 to OFF to end call.
(43)
Remove all
test
equipment
and
restore
data
set
to
pretest
condition.
B.
Contact Interface Test
3.04
The contact interface
test
checks the control
signals supplied to
the
customer. The only
test
equipment required is a 914-type DTS.
3.05 Perform the
test
as follows:
(1)
Connect
and
condition
test
equipment
as
shown in Fig. 1 except
set
DTS
INTERFACE
MODE to CONTACT.
(2)
Apply power to
data
set
and
then
to
test
equipment.
Power
Supply
Test
(3)
Refer to 3.03 and perform
(3)
through
(10).
Page 4
Auto
Answer
Test
Note:
If
auto answer option
Q
is not installed
in
data
set, omit this test.
(4)
Set
VERTICAL MONITOR to
6.
(5)
Set FUNCTION to VOLT INT.
(6)
DTS meter should indicate
-0.7
to
+0.7
Vdc
(CC
ofij.
DS2 should be off.
(7)
Set
FUNCTION to VOLT/OHM EXT.
(8)
Set
RANGE to ohms
-X100.
(9)
Short
METER
INPUT
terminals
and
zero
adjust meter.
(10)
Connect
METER
INPUT
red
and
black
terminals
to
interface
selector
switches
A(22)
and
A(23),
respectively.
(11)
DTS meter should indicate
an
open circuit
(no movement
of
meter).
(12)
Request
DTC
to place call to
data
set.
(13)
When ringing
starts,
meter should indicate
about
2000
ohms.
(14)
During silent period
of
ringing cycle,
set
S4
and
S5 to ON.
Ringing
should
stop
and
data
set
TALK
and
DATA
lamps
should
light.
(15)
Set VERTICAL MONITOR to
6.
(16)
DTS meter should indicate 8.2 to 10.2 Vdc
(CC
on). DS2 should be lighted.
Demodulator
Test
(17)
Refer
to
3'.03
and
perform
(23)
through
(28).
Reverse
Channel
Test
Note:
If
reverse
channel
option T is
not
installed in data set, omit this test.
(18)
Refer
to
3.03
and
perform
(29)
through
(39).
(
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'··
(19)
Place
red
programming
pins
in
matrix
positions TP3-9 and TP3-11.
(20)
Request
DTC
to
measure reverse-channel
tone frequency. Without carrier facilities,
tone
should
be 384
to
390 Hz.
With
carrier
facilities, tone should be 375 to 399 Hz.
(21)
Set
S4
and S5 to OFF
to
end call.
(22)
Remove
all
test
equipment
and
restore
data
set
to
pretest
condition.
4.
SUPPLEMENTARY
TEST
PROCEDURES
4.01
These
tests
ordinarily are
not
required during
installation and maintenance visits
but
should
be
performed
when needed. The end-to-end
test
is
performed when it is ncessary to identify facility
troubles
that
the
data
set
has
been occasionally
experiencing over a period
of
time. The
ground
noise
test
is performed
to
detect
the
presence
of
noise potentials caused by a potential difference
between
data
set
and CPE grounds.
A.
End-to-End Test
4.02
The end-to-end
test
checks
the
transmitter
and
receiver
of
both
data
sets
and
the
facilities connecting
the
data
sets. The customer
interfaces
are
also checked. Identical
test
data
is
generated
by
DTSs
at
both
data
sets. This
data
is transmitted by one
of
the
data
sets
and compared
to
the
data
generated by the DTS
at
the
receiving
data
set.
Data
errors
are
indicated
by
the
DTS
counter. The only
test
equipment
required
is a
914-type DTS
at
the
transmitting
and
receiving
stations.
4.03
A complete end-to-end
test
involves making
two 15-minute
and
ten
1-minute
test
calls
in both directions. These
test
calls should be made
during busy hours to
assure
that
all calls
do
not
use the same
trunks
and
routes. Perform the
test
as
follows:
(1)
Establish voice communication between
the
data
stations
and
arrange
to
conduct
an
end-to-end test.
(2)
At
both stations, connect and condition
test
equipment
as
shown
in
Fig.
2.
ISS
3,
SECTION
592-015-500
(3)
At
both
stations,
apply
power
to
data
set
and then to
test
equipment.
(4)
Establish a 15-minute
test
call.
The
receiving
station
should
verify
that
the
914-type
DTS
NO
DATA
and
NO
CLOCK
lamps
are
off.
This
indicates
that
a
valid
connection
has
been
established
between
the
stations.
U
either
lamp
lights
during
the
test,
the
receiving
station
must
contact
the
transmitting
station
and
arrange
to
retest.
(5)
At
receiving station,
operate
DTS controls
as
follows:
(a)
Set
FUNCTION to PHASE ADJ.
(b)
Adjust PHASE for zero indication on DTS
meter.
(c)
Set
FUNCTION to OFF.
(d)
Set
WORD SYNC
to
MAN
and
release
when counter stops.
(6)
At
receiving
station,
depress
DTS
RESET
and allow counter
to
operate for 1 minute.
Record total
errors
indicated.
(7)
Repeat
(6)
above for a total
of
15 one-minute
runs. Eliminate
the
two
runs
with highest
number
of
errors.
Requirement:
Ten
of
the
13
remaining runs
have less
than
3
errors
per
run. The
other
3
runs
have less
than
11
errors
per
run.
Note:
Refer
to Fig. 3 for
an
example
of
a
form
that
can be used to record
test
results.
(8)
Repeat
(4)
through
(7)
above.
(9)
Establish a 1-minute
test
call.
(10)
At
receiving station, depress DTS RESET
and allow counter to operate for 1 minute.
Record total errors indicated.
(11)
Repeat
(9)
and
(10) above
for
a
total
of
ten 1-minute runs.
Page 5

SECTION
592-015-500
NOTES:
914-TYPE
DTS
(NOTES
I
AND
2)
CONNECTOR
A
1.
AT
TRANSMITTING
DATA
STATION,SET
SWITCHES
ON
914-TYPE
DTS
AS
fOLLCMS:
SWITCH
SETTING
INTERfACE
CORD
SUPPLIED
WITH
914-TYPE
DTS
DATA
SET
202C-TYPE
INTERfACE
CONNECTOR
2.
AT
RECEIVING
DATA
STATION,
SET
SWITCHES
ON
914-TYPE
DTS
AS
fOLLOWS:
SWITCH
INTERfACE
SETTING
SELECTOR
A
ALL
DEPRESSED
SELECTOR
A
ALL
DEPRESSED
INTERfACE
MODE
(NOTE
3)
INTERfACE
MODE
(NOTE
3)
TEST
SET
MODE
SER
(914C)
TEST
SET
MODE
SER
(914C)
TRMT
SER
(9148)
RCV
SER
{914B)
COUNTER
BIT
ERRORS
COUNTER
BIT
ERRORS
fUNCTION
Off
fUNCTION
Off
TRANSMIT
BIT
RATE
(914C)
(NOTE
4)
RCV
BIT
RATE
(914C)
(NOTE
7)
BIT
RATE
(9146)
(NOTE
4)
BIT
RAT£
(914B)
(NOTE
7)
TRANSMIT
WORD
LENGTH
(914C)
63
RCV
WORD
LENGTH
(914C)
63
WORD
LENGTH
(914B)
63
WORD
LENGTH
(9146)
63
SIG
LEV
(914Cl
•
±4V
SAMPLE
WIDTH
.sus
SIGNAL
LEVEL
\914B)
±4V
PHASE
MIDPOSITION
51
(CA)
ON
(NOTE
5)
54
(CD)
ON
51
55
(RY)
Off
(NOTE
6)
54
55
I 2 3 4 5 6 7 8 9
10
II
12
13 14 15
16
17
18
19
20
21
22 23
24 25
STG
• 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
GRO
GRO
0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
~
w
0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
~
~
I
0 0
0.
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
51
I
0 0 0 0 0 0 0 0 0 0 0 0 0
00
00000
0 0 0 0 0 0
~
-
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
052 052
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
~
~
0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
053
053
I
0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
~
m
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
TP2
TP2
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
~
e
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
054
054
. 0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
055
055
0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0
«
~
0000
0 0 0 0 0 0 0 0 0 0
')
0 0 0 0 0 0 0 0 0 0 0
SCT
SCT
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0
~
"
0 0 0 0 0 0 0 0 0 0 0 0
-0
0 0 0 0 0 0 0 0 0 0 0 0 0
SCR
SCR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
056
:>S6
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
~
g
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
057
057
0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
058
058
0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
" u
0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T~
T~
0 0
00
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
u
~
I 2
3
4 5 6 7 8 9
10
II
12
13
14 15
16 17
18
19
?0
21
22
23 24
25
5TG
(DOT
POINTING
UP)
(CA)
Off'
{CD)
ON
(RY)
Off
(NOTE
6)
3.
USE
SETTING
THAT
CORRESPONDS
TO
DATA
SET
INTERfACE.
4.
USE
SETTING
THAT
IS
NEAREST
TO
BIT
RATE
Of
CUSTOMER
PROVIDED
EQU
I
PMENT,
BUT
NOT
LOWER.
5.
fOR
CONTACT
INTERfACE,
REMOVE
PIN
fROM
MATRIX
POSITION
51-4
AND
INSERT
IN
POSITION
TP3•4;
SET
SELECT
SWITCH
TO
+7.0;
AND
SET
OUTPUT
SWITCH
TO
TP3.
6.
fOR
CONTACT
INTERFACE,
SET
SWITCH
55
TO
ON.
7.
USE
SAME
SETTING
AS
THAT
Of
914-TYPE
DTS
AT
TRANSMITTING
DATA
STATION.
Fig.
2-End-to-End
Test
Setup
Page 6
(
(

ISS
3,
SECTION
592-015-500
Date:_.......;...
___
~
___
__,__
(',
Data
Test
Calls
Placed Between:
(
(
LOCATION
(B)
Contemplated Customer
8.0.
Number's
______
_
LONG
DURATION
TI!ST
CALLS
ORIGINATED
PEAK
DISTORTION
_L
AT
TIME
AT
%
--
--
--
--
--
--
-~
--
--
--
--
--
SHORT
DURATION
TEST
CALLS
ORIGINATED
AT
TIME
--
Peak
Dist.
Reading
(%)
-,
One
Minute
Error
Count
(Bits
in
Error)
Peak
Dist.
Reading
(%)
--
One
Minute
Error
Count
(Bits
in
Error)
1
2 3 4
I
-
-,
(READINGS
AT
1 2
3
4
!""-'-
TEL.
#
Of
TEST
LINE
QR
STATION
Under
Control
of
Data
Test Center
a"------
BIT
ERROR
COUNT-
MINUTE
NUMBER
5 6 7 B 9
tO
11
12 13
14
r-----
I
~
SHORT
CAlL-
NUMBER
)
(READINGS
AT
51
, I 2
31
41
5
l_
I
15
Billing
Adjustment
(if
required)
referred
to=-----------------------
Parties
involved
in
Tests=----------~----------------------
Coordinated
with
tests
to
other
locations
at=---------
Comments and
Notes:
Fig.
3-Datcl
Set Performance Test Record
Page
7

SECTION 592-015-500
Requirement: Eight of the 10 runs have
less
than 11 errors per run.
(12) Establish voice communication between the
data stations and arrange to conduct an
end-to-end test in the opposite direction. The
transmitting station now becomes the receiving
station.
(13) At both stations, condition test equipment
as shown in Fig.
2.
(14) Repeat (4) through (11) above.
(15) At both stations, remove all test equipment
and restore
data sets to pretest condition.
B. Ground Noise Test
4.04 If the data set and the CPE are not connected
to the same ground, errors may be caused
by a potential difference between
data set ground
and CPE ground.
To detect the presence of noise
potentials, a
test should be made using the 6-type
impulse counter. This
counter is used to count
the number of impulse noise peaks during a
measured time period, The counter registers only
the peaks
that exceed a preset amplitude and that
are separated by about 150 ms or more.
4.05 The following test equipment is required:
1-6H impulse counter or equivalent
1-914-type DTS or interface test adapter (cover
of 901B DTS)
1-2W6A test cord (310 plug on one end, alligator
clips connected to tip and ring on other end).
Note: Refer to Section 103-620-101 for
information on the 6H impulse counter. If
the 6H impulse counter is not available, a 6A
impulse counter may be used. Refer to Section
103-620-100 for information on the 6A impulse
counter.
4.06 In this test, the impulse counter is connected
between the grounds of the data set and
the CPE. The impulse counter registers when
potential differences of sufficient amplitude have
developed
between the separated grounds. The
914-type DTS is used to gain access to the ground
interface leads. It is assumed that protective
Page 8
ground from the CPE appears at the customer
interface.
4.07 Perform the test as follows:
(1) Using the interface cables provided with
the 914-type DTS, connect the 914-type DTS
connector A to
the customer connector on the
data set, and connect the 914-type DTS connector
B to
the data set connector on the CPE.
(2) On the 914-type DTS, remove all programming
pins
from the matrix. Pull up all A and
B interface selector switches.
(3) Connect one clip of 2W6A cord to interface
selector switch
lA and connect other clip to
switch lB.
(4) Verify that power is applied to data set
and CPE.
(5) Insert 310 plug of 2W6A cord into 310 MEAS
jack on 6H impulse counter.
(6) Set 6H impulse counter DIAL-MEAS switch
to MEAS.
(7) Set 6H impulse counter DBRN dial to 90.
(8) Reset counter on 6H impulse counter to 0.
(9) Set 6H impulse counter MINUTES control
to
15. At the end of the 15-minute period,
record number
of counter indications.
(10) Remove clips of 2W6A cord from 1A and
lB and connect to 7A and 7B.
(11) Repeat (8)and (9) above.
4.08 At the end of both 15-minute periods, there
should be no indications on
the counter of
the 6H impulse counter. If there is an indication
on
the counter, the data set and CPE grounds
must be bonded together according to local instructions.
At the end of the test, remQIIe all test equipment
and restore the
data station to pretest condition.
(
(
(
(

(-,
5.
REFERENCES
5.01 Additional information concerning
the testing
of data set 202C-type is contained in the
following publications:
( SECTION
TITLE
103-620-100 J94006A(6A) Impulse
Counter-
•
Description, Operation, and
Maintenance
103-620-101 6H
and 6HR Impulse Counters
(J9006H and J9006HR)-Description,
Operation, and Maintenance
107-101-100 914-Type
Data Test Sets-De-
scription and Operation
107-200-100 903-Type
Data Test Sets-De-
scription and Operation
314-205-501
Data Systems-DATA-PHONE®
Service and Data Access
Arrangements on Direct Distance
Dialing
Network-Test Require-
(
ments for Subscriber, Foreign
I
\
SECTION
314-410-500
590-010-500
592-015-100
592-015-200
592-015-300
668-102-512
ISS 3, SECTION 592-015-500
TITLE
Exchange, and Remote Exchange
Lines
Voice
Bandwidth Private Line
Data Circuits-Tests and
Requirements
J1P005 Automatic Data Test
System (ADTS)-Operation From
Field Locations
Data Set 202C- Type- Transmitter-
Receiver-Description and Operation
Data Set 202C-Type-Transmitter-
Receiver-Installation and
Connections
Data Set 202C- Type- Transmitter-
Receiver-Maintenance
Data Test Center-904A/B and
904C/D-Test Procedure-Data
Sets 202C- and 202D-Types-
Loop-Back and Dynamic Tests
Page 9
9
Pages